core_test.go

package gocv

import (
	"bytes"
	"image"
	"image/color"
	"image/draw"
	_ "image/jpeg"
	_ "image/png"
	"log"
	"os"
	"strings"
	"testing"
)

func TestMat(t *testing.T) {
	mat := NewMat()
	defer mat.Close()
	if !mat.Empty() {
		t.Error("New Mat should be empty")
	}
}

func TestMatFromBytesWithEmptyByteSlise(t *testing.T) {
	_, err := NewMatFromBytes(600, 800, MatTypeCV8U, []byte{})
	if err == nil {
		t.Error("TestMatFromBytesWithEmptyByteSlise: " +
			"must fail because of an empty byte slise")
	}
	if !strings.Contains(err.Error(), ErrEmptyByteSlice.Error()) {
		t.Errorf("TestMatFromBytesWithEmptyByteSlise: "+
			"error must contain the following description: "+
			"%v, but have: %v", ErrEmptyByteSlice, err)
	}
}

func TestMatWithSize(t *testing.T) {
	mat := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat.Close()
	if mat.Empty() {
		t.Error("NewMatWithSize should not be empty")
	}

	if mat.Rows() != 101 {
		t.Errorf("NewMatWithSize incorrect row count: %v\n", mat.Rows())
	}

	if mat.Cols() != 102 {
		t.Errorf("NewMatWithSize incorrect col count: %v\n", mat.Cols())
	}

	if mat.Channels() != 1 {
		t.Errorf("NewMatWithSize incorrect channels count: %v\n", mat.Channels())
	}

	if mat.Type() != 0 {
		t.Errorf("NewMatWithSize incorrect type: %v\n", mat.Type())
	}
}

func TestMatWithSizeFromScalar(t *testing.T) {
	s := NewScalar(255.0, 105.0, 180.0, 0.0)
	mat := NewMatWithSizeFromScalar(s, 2, 3, MatTypeCV8UC3)
	defer mat.Close()
	if mat.Empty() {
		t.Error("NewMatWithSizeFromScalar should not be empty")
	}

	if mat.Rows() != 2 {
		t.Errorf("NewMatWithSizeFromScalar incorrect row count: %v\n", mat.Rows())
	}

	if mat.Cols() != 3 {
		t.Errorf("NewMatWithSizeFromScalar incorrect col count: %v\n", mat.Cols())
	}

	if mat.Channels() != 3 {
		t.Errorf("NewMatWithSizeFromScalar incorrect channels count: %v\n", mat.Channels())
	}

	if mat.Type() != 16 {
		t.Errorf("NewMatWithSizeFromScalar incorrect type: %v\n", mat.Type())
	}

	if mat.Total() != 6 {
		t.Errorf("incorrect total: %v\n", mat.Total())
	}

	sz := mat.Size()
	if sz[0] != 2 && sz[1] != 3 {
		t.Errorf("NewMatWithSize incorrect size: %v\n", sz)
	}

	matChans := Split(mat)
	scalarByte := []byte{255, 105, 180}
	for c := 0; c < mat.Channels(); c++ {
		for i := 0; i < mat.Rows(); i++ {
			for j := 0; j < mat.Cols(); j++ {
				if s := matChans[c].GetUCharAt(i, j); s != scalarByte[c] {
					t.Errorf("NewMatWithSizeFromScalar incorrect scalar: %v\n", s)
				}
			}
		}
	}
}

func TestMatFromPtr(t *testing.T) {
	mat := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat.Close()
	pmat, _ := mat.FromPtr(11, 12, MatTypeCV8U, 10, 10)
	defer pmat.Close()

	if pmat.Rows() != 11 {
		t.Errorf("Mat copy incorrect row count: %v\n", pmat.Rows())
	}

	if pmat.Cols() != 12 {
		t.Errorf("Mat copy incorrect col count: %v\n", pmat.Cols())
	}
}

func TestMatClone(t *testing.T) {
	mat := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat.Close()
	clone := mat.Clone()
	defer clone.Close()
	if clone.Rows() != 101 {
		t.Errorf("Mat clone incorrect row count: %v\n", clone.Rows())
	}

	if clone.Cols() != 102 {
		t.Errorf("Mat clone incorrect col count: %v\n", clone.Cols())
	}
}

func TestMatCopyTo(t *testing.T) {
	mat := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat.Close()
	copy := NewMat()
	defer copy.Close()

	mat.CopyTo(&copy)
	if copy.Rows() != 101 {
		t.Errorf("Mat copy incorrect row count: %v\n", copy.Rows())
	}

	if copy.Cols() != 102 {
		t.Errorf("Mat copy incorrect col count: %v\n", copy.Cols())
	}
}

func TestMatCopyToWithMask(t *testing.T) {
	mat := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat.Close()
	mask := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mask.Close()
	diff := NewMat()
	defer diff.Close()

	mat.SetUCharAt(0, 0, 255)
	mat.SetUCharAt(0, 1, 255)

	mask.SetUCharAt(0, 0, 255)

	copy := NewMat()
	defer copy.Close()

	mat.CopyToWithMask(&copy, mask)
	if copy.Rows() != 101 {
		t.Errorf("Mat copy incorrect row count: %v\n", copy.Rows())
	}

	if copy.Cols() != 102 {
		t.Errorf("Mat copy incorrect col count: %v\n", copy.Cols())
	}

	if copy.GetUCharAt(0, 0) != 255 || copy.GetUCharAt(0, 1) != 0 {
		t.Errorf("Mask failed to apply to source image")
	}

	Compare(mat, copy, &diff, CompareEQ)
	if CountNonZero(diff) == 0 {
		t.Errorf("Mat CopyToWithMask incorrect diff: %v\n", CountNonZero(diff))
	}
}

func TestMatToBytes(t *testing.T) {
	mat1 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat1.Close()
	b := mat1.ToBytes()
	if len(b) != 101*102 {
		t.Errorf("Mat bytes incorrect length: %v\n", len(b))
	}

	copy, err := NewMatFromBytes(101, 102, MatTypeCV8U, b)
	if err != nil {
		t.Error(err.Error())
	}
	defer copy.Close()
	if copy.Rows() != 101 {
		t.Errorf("Mat from bytes incorrect row count: %v\n", copy.Rows())
	}
	if copy.Cols() != 102 {
		t.Errorf("Mat region incorrect col count: %v\n", copy.Cols())
	}

	mat2 := NewMatWithSize(101, 102, MatTypeCV16S)
	defer mat2.Close()
	b = mat2.ToBytes()
	if len(b) != 101*102*2 {
		t.Errorf("Mat bytes incorrect length: %v\n", len(b))
	}

	mat3 := NewMatFromScalar(NewScalar(255.0, 105.0, 180.0, 0.0), MatTypeCV8UC3)
	defer mat3.Close()
	b = mat3.ToBytes()
	if len(b) != 3 {
		t.Errorf("Mat bytes incorrect length: %v\n", len(b))
	}
	if bytes.Compare(b, []byte{255, 105, 180}) != 0 {
		t.Errorf("Mat bytes unexpected values: %v\n", b)
	}
}

func TestMatDataPtr(t *testing.T) {
	const (
		rows = 101
		cols = 102
	)
	t.Run("Uint8", func(t *testing.T) {
		testPoints := []struct {
			row int
			col int
			val uint8
		}{
			{row: 0, col: 0, val: 10},
			{row: 30, col: 31, val: 20},
			{row: rows - 1, col: cols - 1, val: 30},
		}

		mat1 := NewMatWithSize(rows, cols, MatTypeCV8U)
		defer mat1.Close()

		b := mat1.DataPtrUint8()
		if len(b) != 101*102 {
			t.Errorf("Mat bytes incorrect length: %v\n", len(b))
		}

		for _, p := range testPoints {
			mat1.SetUCharAt(p.row, p.col, p.val)

			if got := b[p.row*cols+p.col]; got != p.val {
				t.Errorf("Expected %d,%d = %d, but it was %d", p.row, p.col, p.val, got)
			}
		}

		mat2 := NewMatWithSize(3, 9, MatTypeCV32F)
		defer mat2.Close()
		b = mat2.DataPtrUint8()
		if len(b) != 3*9*4 {
			t.Errorf("Mat bytes incorrect length: %v\n", len(b))
		}
	})
	t.Run("Int8", func(t *testing.T) {
		testPoints := []struct {
			row int
			col int
			val int8
		}{
			{row: 0, col: 0, val: 10},
			{row: 30, col: 31, val: 20},
			{row: rows - 1, col: cols - 1, val: 30},
		}

		mat1 := NewMatWithSize(101, 102, MatTypeCV8S)
		defer mat1.Close()

		b := mat1.DataPtrInt8()
		if len(b) != rows*cols {
			t.Errorf("Mat bytes incorrect length: %v\n", len(b))
		}

		for _, p := range testPoints {
			mat1.SetSCharAt(p.row, p.col, p.val)

			if got := b[p.row*cols+p.col]; got != p.val {
				t.Errorf("Expected %d,%d = %d, but it was %d", p.row, p.col, p.val, got)
			}
		}

		mat2 := NewMatWithSize(3, 9, MatTypeCV32F)
		defer mat2.Close()
		b = mat2.DataPtrInt8()
		if len(b) != 3*9*4 {
			t.Errorf("Mat bytes incorrect length: %v\n", len(b))
		}
	})
	t.Run("Uint16", func(t *testing.T) {
		testPoints := []struct {
			row int
			col int
			val uint16
		}{
			{row: 0, col: 0, val: 10},
			{row: 30, col: 31, val: 20},
			{row: rows - 1, col: cols - 1, val: 30},
		}

		mat1 := NewMatWithSize(rows, cols, MatTypeCV16U)
		defer mat1.Close()

		b, err := mat1.DataPtrUint16()
		if err != nil {
			t.Error(err)
		}
		if len(b) != rows*cols {
			t.Errorf("Mat bytes incorrect length: %v\n", len(b))
		}

		for _, p := range testPoints {
			mat1.SetShortAt(p.row, p.col, int16(p.val))

			if got := b[p.row*cols+p.col]; got != p.val {
				t.Errorf("Expected %d,%d = %d, but it was %d", p.row, p.col, p.val, got)
			}
		}

		mat2 := NewMatWithSize(3, 9, MatTypeCV32F)
		defer mat2.Close()
		_, err = mat2.DataPtrUint16()
		if err == nil {
			t.Errorf("Expected error.")
		}
	})
	t.Run("Int16", func(t *testing.T) {
		testPoints := []struct {
			row int
			col int
			val int16
		}{
			{row: 0, col: 0, val: 10},
			{row: 30, col: 31, val: 20},
			{row: rows - 1, col: cols - 1, val: 30},
		}

		mat1 := NewMatWithSize(rows, cols, MatTypeCV16S)
		defer mat1.Close()

		b, err := mat1.DataPtrInt16()
		if err != nil {
			t.Error(err)
		}
		if len(b) != rows*cols {
			t.Errorf("Mat bytes incorrect length: %v\n", len(b))
		}

		for _, p := range testPoints {
			mat1.SetShortAt(p.row, p.col, p.val)

			if got := b[p.row*cols+p.col]; got != p.val {
				t.Errorf("Expected %d,%d = %d, but it was %d", p.row, p.col, p.val, got)
			}
		}

		mat2 := NewMatWithSize(3, 9, MatTypeCV32F)
		defer mat2.Close()
		_, err = mat2.DataPtrInt16()
		if err == nil {
			t.Errorf("Expected error.")
		}
	})
	t.Run("Float32", func(t *testing.T) {
		testPoints := []struct {
			row int
			col int
			val float32
		}{
			{row: 0, col: 0, val: 10.5},
			{row: 30, col: 31, val: 20.5},
			{row: rows - 1, col: cols - 1, val: 30.5},
		}

		mat1 := NewMatWithSize(rows, cols, MatTypeCV32F)
		defer mat1.Close()

		b, err := mat1.DataPtrFloat32()
		if err != nil {
			t.Error(err)
		}
		if len(b) != rows*cols {
			t.Errorf("Mat bytes incorrect length: %v\n", len(b))
		}

		for _, p := range testPoints {
			mat1.SetFloatAt(p.row, p.col, p.val)

			if got := b[p.row*cols+p.col]; got != p.val {
				t.Errorf("Expected %d,%d = %f, but it was %f", p.row, p.col, p.val, got)
			}
		}

		mat2 := NewMatWithSize(3, 9, MatTypeCV16S)
		defer mat2.Close()
		_, err = mat2.DataPtrFloat32()
		if err == nil {
			t.Errorf("Expected error.")
		}
	})
	t.Run("Float64", func(t *testing.T) {
		testPoints := []struct {
			row int
			col int
			val float64
		}{
			{row: 0, col: 0, val: 10.5},
			{row: 30, col: 31, val: 20.5},
			{row: rows - 1, col: cols - 1, val: 30.5},
		}

		mat1 := NewMatWithSize(rows, cols, MatTypeCV64F)
		defer mat1.Close()

		b, err := mat1.DataPtrFloat64()
		if err != nil {
			t.Error(err)
		}
		if len(b) != rows*cols {
			t.Errorf("Mat bytes incorrect length: %v\n", len(b))
		}

		for _, p := range testPoints {
			mat1.SetDoubleAt(p.row, p.col, p.val)

			if got := b[p.row*cols+p.col]; got != p.val {
				t.Errorf("Expected %d,%d = %f, but it was %f", p.row, p.col, p.val, got)
			}
		}

		mat2 := NewMatWithSize(3, 9, MatTypeCV16S)
		defer mat2.Close()
		_, err = mat2.DataPtrFloat64()
		if err == nil {
			t.Errorf("Expected error.")
		}
	})
}

func TestMatRegion(t *testing.T) {
	mat := NewMatWithSize(100, 100, MatTypeCV8U)
	defer mat.Close()
	region := mat.Region(image.Rect(20, 25, 80, 75))
	defer region.Close()
	if region.Rows() != 50 {
		t.Errorf("Mat region incorrect row count: %v\n", region.Rows())
	}

	if region.Cols() != 60 {
		t.Errorf("Mat region incorrect col count: %v\n", region.Cols())
	}
}

func TestMatReshape(t *testing.T) {
	mat := NewMatWithSize(100, 100, MatTypeCV8UC4)
	defer mat.Close()

	r := mat.Reshape(1, 1)
	defer r.Close()
	if r.Rows() != 1 {
		t.Errorf("Mat reshape incorrect row count: %v\n", r.Rows())
	}

	if r.Cols() != 40000 {
		t.Errorf("Mat reshape incorrect col count: %v\n", r.Cols())
	}
}

func TestMatPatchNaNs(t *testing.T) {
	mat := NewMatWithSize(100, 100, MatTypeCV32F)
	defer mat.Close()

	mat.PatchNaNs()
	if mat.Empty() {
		t.Error("TestMatPatchNaNs error.")
	}
}

func TestMatConvert(t *testing.T) {
	src := NewMatWithSize(100, 100, MatTypeCV32F)
	defer src.Close()
	dst := NewMat()
	defer dst.Close()
	src.ConvertTo(&dst, MatTypeCV16S)
	if dst.Empty() {
		t.Error("TestConvert dst should not be empty.")
	}
}

func TestMatConvertWithParams(t *testing.T) {
	src := NewMatWithSize(100, 100, MatTypeCV8U)
	defer src.Close()
	dst := NewMat()
	defer dst.Close()
	src.ConvertToWithParams(&dst, MatTypeCV32F, 1.0/255.0, 0.0)
	if dst.Empty() {
		t.Error("TestConvertWithParams dst should not be empty.")
	}
}

func TestMatConvertFp16(t *testing.T) {
	src := NewMatWithSize(100, 100, MatTypeCV32F)
	defer src.Close()
	dst := src.ConvertFp16()
	defer dst.Close()
	if dst.Empty() {
		t.Error("TestConvertFp16 dst should not be empty.")
	}
}

func TestMatSqrt(t *testing.T) {
	src := NewMatWithSize(100, 100, MatTypeCV32F)
	defer src.Close()

	dst := src.Sqrt()
	defer dst.Close()
	if dst.Empty() {
		t.Error("TestSqrt dst should not be empty.")
	}
}

func TestMatMean(t *testing.T) {
	mat := NewMatWithSize(100, 100, MatTypeCV8U)
	defer mat.Close()
	mean := mat.Mean()
	if mean.Val1 != 0 {
		t.Errorf("Mat Mean incorrect Val1")
	}
}

func TestMatMeanWithMask(t *testing.T) {
	mat := NewMatWithSize(100, 100, MatTypeCV8U)
	defer mat.Close()
	mask := NewMatWithSize(100, 100, MatTypeCV8U)
	defer mask.Close()
	mean := mat.MeanWithMask(mask)
	if mean.Val1 != 0 {
		t.Errorf("Mat Mean incorrect Val1")
	}
}

func TestLUT(t *testing.T) {
	src := IMRead("images/gocvlogo.jpg", IMReadColor)
	if src.Empty() {
		t.Error("Invalid read of Source Mat in LUT test")
	}
	defer src.Close()

	lut := IMRead("images/lut.png", IMReadColor)
	if lut.Empty() {
		t.Error("Invalid read of LUT Mat in LUT test")
	}
	defer lut.Close()

	dst := NewMat()
	defer dst.Close()

	LUT(src, lut, &dst)
	if dst.Cols() != 400 || dst.Rows() != 343 {
		t.Errorf("Expected dst size of 200x172 got %dx%d", dst.Cols(), dst.Rows())
	}
}

func TestMatAccessors(t *testing.T) {
	mat := NewMatWithSize(101, 102, MatTypeCV8U)
	if mat.GetUCharAt(50, 50) != 0 {
		t.Errorf("GetUCharAt incorrect value: %v\n", mat.GetUCharAt(50, 50))
	}
	if mat.GetUCharAt3(50, 50, 0) != 0 {
		t.Errorf("GetUCharAt3 incorrect value: %v\n", mat.GetUCharAt3(50, 50, 0))
	}
	mat.Close()

	mat = NewMatWithSize(101, 102, MatTypeCV8S)
	if mat.GetSCharAt(50, 50) != 0 {
		t.Errorf("GetSCharAt incorrect value: %v\n", mat.GetSCharAt(50, 50))
	}
	if mat.GetSCharAt3(50, 50, 0) != 0 {
		t.Errorf("GetSCharAt3 incorrect value: %v\n", mat.GetSCharAt3(50, 50, 0))
	}
	mat.Close()

	mat = NewMatWithSize(101, 102, MatTypeCV16S)
	if mat.GetShortAt(50, 50) != 0 {
		t.Errorf("GetShortAt incorrect value: %v\n", mat.GetShortAt(50, 50))
	}
	if mat.GetShortAt3(50, 50, 0) != 0 {
		t.Errorf("GetShortAt3 incorrect value: %v\n", mat.GetShortAt3(50, 50, 0))
	}
	mat.Close()

	mat = NewMatWithSize(101, 102, MatTypeCV32S)
	if mat.GetIntAt(50, 50) != 0 {
		t.Errorf("GetIntAt incorrect value: %v\n", mat.GetIntAt(50, 50))
	}
	if mat.GetIntAt3(50, 50, 0) != 0 {
		t.Errorf("GetIntAt3 incorrect value: %v\n", mat.GetIntAt3(50, 50, 0))
	}
	mat.Close()

	mat = NewMatWithSize(101, 102, MatTypeCV32F)
	if mat.GetFloatAt(50, 50) != 0.0 {
		t.Errorf("GetFloatAt incorrect value: %v\n", mat.GetFloatAt(50, 50))
	}
	if mat.GetFloatAt3(50, 50, 0) != 0.0 {
		t.Errorf("GetFloatAt3 incorrect value: %v\n", mat.GetFloatAt3(50, 50, 0))
	}
	mat.Close()

	mat = NewMatWithSize(101, 102, MatTypeCV64F)
	if mat.GetDoubleAt(50, 50) != 0.0 {
		t.Errorf("GetDoubleAt incorrect value: %v\n", mat.GetDoubleAt(50, 50))
	}
	if mat.GetDoubleAt3(50, 50, 0) != 0.0 {
		t.Errorf("GetDoubleAt3 incorrect value: %v\n", mat.GetDoubleAt3(50, 50, 0))
	}
	mat.Close()
}

func TestMatMutators(t *testing.T) {
	t.Run("SetTo", func(t *testing.T) {
		mat := NewMatWithSizeFromScalar(NewScalar(0, 0, 0, 0), 1, 1, MatTypeCV8U)
		mat.SetTo(NewScalar(255, 255, 255, 255))
		for z := 0; z < mat.Channels(); z++ {
			if mat.GetUCharAt3(0, 0, z) != 255 {
				t.Errorf("SetTo incorrect value: z=%v: %v\n", z, mat.GetUCharAt3(0, 0, z))
			}
		}
		mat.Close()
	})
	t.Run("SetUCharAt", func(t *testing.T) {
		mat := NewMatWithSize(101, 102, MatTypeCV8U)
		mat.SetUCharAt(50, 50, 25)
		if mat.GetUCharAt(50, 50) != 25 {
			t.Errorf("SetUCharAt incorrect value: %v\n", mat.GetUCharAt(50, 50))
		}
		mat.Close()
	})
	t.Run("SetUCharAt3", func(t *testing.T) {
		mat := NewMatWithSize(101, 102, MatTypeCV8U)
		mat.SetUCharAt3(50, 50, 0, 25)
		if mat.GetUCharAt3(50, 50, 0) != 25 {
			t.Errorf("SetUCharAt3 incorrect value: %v\n", mat.GetUCharAt3(50, 50, 0))
		}
		mat.Close()
	})
	t.Run("SetSCharAt", func(t *testing.T) {
		mat := NewMatWithSize(101, 102, MatTypeCV8S)
		mat.SetSCharAt(50, 50, 25)
		if mat.GetSCharAt(50, 50) != 25 {
			t.Errorf("SetSCharAt incorrect value: %v\n", mat.GetSCharAt(50, 50))
		}
		mat.Close()
	})
	t.Run("SetSCharAt3", func(t *testing.T) {
		mat := NewMatWithSize(101, 102, MatTypeCV8S)
		mat.SetSCharAt3(50, 50, 0, 25)
		if mat.GetSCharAt3(50, 50, 0) != 25 {
			t.Errorf("SetSCharAt3 incorrect value: %v\n", mat.GetSCharAt3(50, 50, 0))
		}
		mat.Close()
	})
	t.Run("SetShortAt", func(t *testing.T) {
		mat := NewMatWithSize(101, 102, MatTypeCV16S)
		mat.SetShortAt(50, 50, 25)
		if mat.GetShortAt(50, 50) != 25 {
			t.Errorf("SetShortAt incorrect value: %v\n", mat.GetShortAt(50, 50))
		}
		mat.Close()
	})
	t.Run("SetShortAt3", func(t *testing.T) {
		mat := NewMatWithSize(101, 102, MatTypeCV16S)
		mat.SetShortAt3(50, 50, 0, 25)
		if mat.GetShortAt3(50, 50, 0) != 25 {
			t.Errorf("SetShortAt3 incorrect value: %v\n", mat.GetShortAt3(50, 50, 0))
		}
		mat.Close()
	})
	t.Run("SetIntAt", func(t *testing.T) {
		mat := NewMatWithSize(101, 102, MatTypeCV32S)
		mat.SetIntAt(50, 50, 25)
		if mat.GetIntAt(50, 50) != 25 {
			t.Errorf("SetIntAt incorrect value: %v\n", mat.GetIntAt(50, 50))
		}
		mat.Close()
	})
	t.Run("SetIntAt3", func(t *testing.T) {
		mat := NewMatWithSize(101, 102, MatTypeCV32S)
		mat.SetIntAt3(50, 50, 0, 25)
		if mat.GetIntAt3(50, 50, 0) != 25 {
			t.Errorf("SetIntAt3 incorrect value: %v\n", mat.GetIntAt3(50, 50, 0))
		}
		mat.Close()
	})
	t.Run("SetFloatAt", func(t *testing.T) {
		mat := NewMatWithSize(101, 102, MatTypeCV32F)
		mat.SetFloatAt(50, 50, 25.0)
		if mat.GetFloatAt(50, 50) != 25 {
			t.Errorf("SetFloatAt incorrect value: %v\n", mat.GetFloatAt(50, 50))
		}
		mat.Close()
	})
	t.Run("SetFloatAt3", func(t *testing.T) {
		mat := NewMatWithSize(101, 102, MatTypeCV32F)
		mat.SetFloatAt3(50, 50, 0, 25.0)
		if mat.GetFloatAt3(50, 50, 0) != 25 {
			t.Errorf("SetFloatAt incorrect value: %v\n", mat.GetFloatAt3(50, 50, 0))
		}
		mat.Close()
	})
	t.Run("SetDoubleAt", func(t *testing.T) {
		mat := NewMatWithSize(101, 102, MatTypeCV64F)
		mat.SetDoubleAt(50, 50, 25.0)
		if mat.GetDoubleAt(50, 50) != 25.0 {
			t.Errorf("SetDoubleAt incorrect value: %v\n", mat.GetDoubleAt(50, 50))
		}
		mat.Close()
	})
	t.Run("SetDoubleAt3", func(t *testing.T) {
		mat := NewMatWithSize(101, 102, MatTypeCV64F)
		mat.SetDoubleAt3(50, 50, 0, 25.0)
		if mat.GetDoubleAt3(50, 50, 0) != 25.0 {
			t.Errorf("SetDoubleAt3 incorrect value: %v\n", mat.GetDoubleAt3(50, 50, 0))
		}
		mat.Close()
	})
	t.Run("AddUChar", func(t *testing.T) {
		mat := NewMatWithSize(101, 102, MatTypeCV8U)
		mat.AddUChar(42)
		if mat.GetUCharAt(50, 50) != 42 {
			t.Errorf("AddUChar incorrect value: %v\n", mat.GetUCharAt(50, 50))
		}
		mat.Close()
	})
	t.Run("SubtractUChar", func(t *testing.T) {
		mat := NewMatWithSizeFromScalar(NewScalar(42.0, 0, 0, 0), 101, 102, MatTypeCV8U)
		mat.SubtractUChar(40)
		if mat.GetUCharAt(50, 50) != 2 {
			t.Errorf("SubtractUChar incorrect value: %v\n", mat.GetUCharAt(50, 50))
		}
		mat.Close()
	})
	t.Run("MultiplyUChar", func(t *testing.T) {
		mat := NewMatWithSizeFromScalar(NewScalar(5.0, 0, 0, 0), 101, 102, MatTypeCV8U)
		mat.MultiplyUChar(5)
		if mat.GetUCharAt(50, 50) != 25 {
			t.Errorf("MultiplyUChar incorrect value: %v\n", mat.GetUCharAt(50, 50))
		}
		mat.Close()
	})
	t.Run("DivideUChar", func(t *testing.T) {
		mat := NewMatWithSizeFromScalar(NewScalar(25.0, 0, 0, 0), 101, 102, MatTypeCV8U)
		mat.DivideUChar(5)
		if mat.GetUCharAt(50, 50) != 5 {
			t.Errorf("DivideUChar incorrect value: %v\n", mat.GetUCharAt(50, 50))
		}
		mat.Close()
	})
	t.Run("AddFloat", func(t *testing.T) {
		mat := NewMatWithSizeFromScalar(NewScalar(30.0, 0, 0, 0), 101, 102, MatTypeCV32F)
		mat.AddFloat(1.0)
		if mat.GetFloatAt(50, 50) != 31.0 {
			t.Errorf("AddFloat incorrect value: %v\n", mat.GetFloatAt(50, 50))
		}
		mat.Close()
	})
	t.Run("SubtractFloat", func(t *testing.T) {
		mat := NewMatWithSizeFromScalar(NewScalar(30.0, 0, 0, 0), 101, 102, MatTypeCV32F)
		mat.SubtractFloat(1.0)
		if mat.GetFloatAt(50, 50) != 29.0 {
			t.Errorf("SubtractFloat incorrect value: %v\n", mat.GetFloatAt(50, 50))
		}
		mat.Close()
	})
	t.Run("MultiplyFloat", func(t *testing.T) {
		mat := NewMatWithSizeFromScalar(NewScalar(30.0, 0, 0, 0), 101, 102, MatTypeCV32F)
		mat.MultiplyFloat(2.0)
		if mat.GetFloatAt(50, 50) != 60.0 {
			t.Errorf("MultiplyFloat incorrect value: %v\n", mat.GetFloatAt(50, 50))
		}
		mat.Close()
	})
	t.Run("DivideFloat", func(t *testing.T) {
		mat := NewMatWithSizeFromScalar(NewScalar(30.0, 0, 0, 0), 101, 102, MatTypeCV32F)
		mat.DivideFloat(2.0)
		if mat.GetFloatAt(50, 50) != 15.0 {
			t.Errorf("DivideFloat incorrect value: %v\n", mat.GetFloatAt(50, 50))
		}
		mat.Close()
	})
	t.Run("MultiplyMatrix", func(t *testing.T) {
		mat := NewMatWithSizeFromScalar(NewScalar(30.0, 0, 0, 0), 2, 1, MatTypeCV32F)
		mat2 := NewMatWithSizeFromScalar(NewScalar(30.0, 0, 0, 0), 1, 2, MatTypeCV32F)
		mat3 := mat.MultiplyMatrix(mat2)
		for i := 0; i < mat3.Cols(); i++ {
			for j := 0; j < mat3.Rows(); j++ {
				if mat3.GetFloatAt(i, j) != 900.0 {
					t.Errorf("MultiplyMatrix incorrect value: %v\n", mat3.GetFloatAt(i, j))
				}
			}
		}
		mat.Close()
		mat2.Close()
		mat3.Close()
	})
}

func TestMatAbsDiff(t *testing.T) {
	mat1 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat1.Close()
	mat2 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat2.Close()
	mat3 := NewMat()
	defer mat3.Close()
	AbsDiff(mat1, mat2, &mat3)
	if mat3.Empty() {
		t.Error("TestMatAbsDiff dest mat3 should not be empty.")
	}
}

func TestMatAdd(t *testing.T) {
	mat1 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat1.Close()
	mat2 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat2.Close()
	mat3 := NewMat()
	defer mat3.Close()
	Add(mat1, mat2, &mat3)
	if mat3.Empty() {
		t.Error("TestMatAdd dest mat3 should not be empty.")
	}
}

func TestMatAddWeighted(t *testing.T) {
	mat1 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat1.Close()
	mat2 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat2.Close()
	mat3 := NewMat()
	defer mat3.Close()
	AddWeighted(mat1, 2.0, mat2, 3.0, 4.0, &mat3)
	if mat3.Empty() {
		t.Error("TestMatAddWeighted dest mat3 should not be empty.")
	}
}

func TestMatBitwiseOperations(t *testing.T) {
	mat1 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat1.Close()
	mat2 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat2.Close()
	mat3 := NewMat()
	defer mat3.Close()
	BitwiseAnd(mat1, mat2, &mat3)
	if mat3.Empty() {
		t.Error("TestMatBitwiseAnd dest mat3 should not be empty.")
	}

	BitwiseOr(mat1, mat2, &mat3)
	if mat3.Empty() {
		t.Error("TestMatBitwiseOr dest mat3 should not be empty.")
	}

	BitwiseXor(mat1, mat2, &mat3)
	if mat3.Empty() {
		t.Error("TestMatBitwiseXor dest mat3 should not be empty.")
	}

	BitwiseNot(mat1, &mat3)
	if mat3.Empty() {
		t.Error("TestMatBitwiseNot dest mat3 should not be empty.")
	}

}

func TestMatBitwiseOperationsWithMasks(t *testing.T) {
	mat1 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat1.Close()
	mat2 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat2.Close()
	mat3 := NewMat()
	defer mat3.Close()
	mat4 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat4.Close()
	BitwiseAndWithMask(mat1, mat2, &mat3, mat4)
	if mat3.Empty() {
		t.Error("TestMatBitwiseAndWithMask dest mat3 should not be empty.")
	}

	BitwiseOrWithMask(mat1, mat2, &mat3, mat4)
	if mat3.Empty() {
		t.Error("TestMatBitwiseOrWithMask dest mat3 should not be empty.")
	}

	BitwiseXorWithMask(mat1, mat2, &mat3, mat4)
	if mat3.Empty() {
		t.Error("TestMatBitwiseXorWithMask dest mat3 should not be empty.")
	}
	BitwiseNotWithMask(mat1, &mat3, mat4)
	if mat3.Empty() {
		t.Error("TestMatBitwiseNotWithMask dest mat3 should not be empty.")
	}
}

func TestMatInRange(t *testing.T) {
	mat1 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat1.Close()
	lb := NewMatFromScalar(NewScalar(20.0, 100.0, 100.0, 0.0), MatTypeCV8U)
	defer lb.Close()
	ub := NewMatFromScalar(NewScalar(20.0, 100.0, 100.0, 0.0), MatTypeCV8U)
	defer ub.Close()
	dst := NewMat()
	defer dst.Close()
	InRange(mat1, lb, ub, &dst)
	if dst.Empty() {
		t.Error("TestMatAddWeighted dest mat3 should not be empty.")
	}
}

func TestMatInRangeWithScalar(t *testing.T) {
	mat1 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat1.Close()
	lb := NewScalar(20.0, 100.0, 100.0, 0.0)
	ub := NewScalar(20.0, 100.0, 100.0, 0.0)
	dst := NewMat()
	defer dst.Close()
	InRangeWithScalar(mat1, lb, ub, &dst)
	if dst.Empty() {
		t.Error("TestMatAddWeighted dest mat3 should not be empty.")
	}
}

func TestMatDCT(t *testing.T) {
	src := NewMatWithSize(64, 64, MatTypeCV32F)
	defer src.Close()
	dst := NewMat()
	defer dst.Close()

	DCT(src, &dst, DftForward)
	if dst.Empty() {
		t.Error("TestMatDCT dst should not be empty.")
	}
}

func TestMatDFT(t *testing.T) {
	src := NewMatWithSize(101, 102, MatTypeCV32F)
	defer src.Close()
	dst := NewMat()
	defer dst.Close()

	m := GetOptimalDFTSize(101)
	n := GetOptimalDFTSize(102)
	if m != 108 {
		t.Errorf("TestMatOptimalDFT dst error: %d", m)
	}

	if n != 108 {
		t.Errorf("TestMatOptimalDFT dst error: %d", n)
	}

	DFT(src, &dst, DftForward)
	if dst.Empty() {
		t.Error("TestMatDFT dst should not be empty.")
	}
}

func TestMatDivide(t *testing.T) {
	mat1 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat1.Close()
	mat2 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat2.Close()
	mat3 := NewMat()
	defer mat3.Close()
	Divide(mat1, mat2, &mat3)
	if mat3.Empty() {
		t.Error("TestMatDivide dest mat3 should not be empty.")
	}
}

func TestMeanStdDev(t *testing.T) {
	src := NewMatWithSize(101, 102, MatTypeCV8U)
	defer src.Close()
	dst := NewMat()
	defer dst.Close()
	dstStdDev := NewMat()
	defer dstStdDev.Close()
	MeanStdDev(src, &dst, &dstStdDev)
	if dst.Empty() {
		t.Error("TestMeanStdDev dst should not be empty.")
	}
	if dstStdDev.Empty() {
		t.Error("TestMeanStdDev dstStdDev should not be empty.")
	}
}

func TestMatMerge(t *testing.T) {
	src := NewMatWithSize(101, 102, MatTypeCV8U)
	defer src.Close()
	src2 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer src2.Close()
	src3 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer src3.Close()
	dst := NewMat()
	defer dst.Close()
	Merge([]Mat{src, src2, src3}, &dst)
	if dst.Empty() {
		t.Error("TestMatMerge dst should not be empty.")
	}
}

func TestMatMulSpectrums(t *testing.T) {
	a := NewMatWithSize(101, 102, MatTypeCV32F)
	defer a.Close()
	b := NewMatWithSize(101, 102, MatTypeCV32F)
	defer b.Close()
	dst := NewMat()
	defer dst.Close()
	MulSpectrums(a, b, &dst, 0)
	if dst.Empty() {
		t.Error("TestMatMulSpectrums dst should not be empty.")
	}
	dst2 := NewMat()
	defer dst2.Close()
	//test with dftrows flag (the only flag accepted in addition to 0)
	MulSpectrums(a, b, &dst2, DftRows)
	if dst2.Empty() {
		t.Error("TestMatMulSpectrums dst should not be empty.")
	}
}

func TestMatMultiply(t *testing.T) {
	mat1 := NewMatWithSize(101, 102, MatTypeCV64F)
	defer mat1.Close()
	mat2 := NewMatWithSize(101, 102, MatTypeCV64F)
	defer mat2.Close()
	mat3 := NewMat()
	defer mat3.Close()
	Multiply(mat1, mat2, &mat3)
	if mat3.Empty() {
		t.Error("TestMatMultiply dest mat3 should not be empty.")
	}

	// since this is a single channel Mat, only the first value in the scalar is used
	mat4 := NewMatWithSizeFromScalar(NewScalar(2.0, 0.0, 0.0, 0.0), 101, 102, MatTypeCV64F)
	defer mat4.Close()
	mat5 := NewMatWithSizeFromScalar(NewScalar(3.0, 0.0, 0.0, 0.0), 101, 102, MatTypeCV64F)
	defer mat5.Close()
	Multiply(mat4, mat5, &mat3)
	if mat3.Empty() {
		t.Error("TestMatMultiply dest mat3 should not be empty.")
	}
	if mat3.GetDoubleAt(0, 0) != 6.0 {
		t.Error("TestMatMultiply invalue value in dest mat3.")
	}
}

func TestMatMultiplyWithParams(t *testing.T) {
	mat1 := NewMatWithSize(101, 102, MatTypeCV64F)
	defer mat1.Close()
	mat2 := NewMatWithSize(101, 102, MatTypeCV64F)
	defer mat2.Close()
	mat3 := NewMat()
	defer mat3.Close()
	MultiplyWithParams(mat1, mat2, &mat3, 0.5, -1)
	if mat3.Empty() {
		t.Error("TestMatMultiplyWithParams dest mat3 should not be empty.")
	}

	// since this is a single channel Mat, only the first value in the scalar is used
	mat4 := NewMatWithSizeFromScalar(NewScalar(2.0, 0.0, 0.0, 0.0), 101, 102, MatTypeCV64F)
	defer mat4.Close()
	mat5 := NewMatWithSizeFromScalar(NewScalar(3.0, 0.0, 0.0, 0.0), 101, 102, MatTypeCV64F)
	defer mat5.Close()
	MultiplyWithParams(mat4, mat5, &mat3, 2.0, -1)
	if mat3.Empty() {
		t.Error("TestMatMultiplyWithParams dest mat3 should not be empty.")
	}
	if mat3.GetDoubleAt(0, 0) != 12.0 {
		t.Error("TestMatMultiplyWithParams invalue value in dest mat3.")
	}
}

func TestMatNormalize(t *testing.T) {
	src := NewMatWithSize(101, 102, MatTypeCV8U)
	defer src.Close()
	dst := NewMat()
	defer dst.Close()
	Normalize(src, &dst, 0.0, 255.0, NormMinMax)
	if dst.Empty() {
		t.Error("TestMatNormalize dst should not be empty.")
	}
}

func TestMatPerspectiveTransform(t *testing.T) {
	src := NewMatWithSize(100, 1, MatTypeCV32F+MatChannels2)
	defer src.Close()
	dst := NewMat()
	defer dst.Close()
	tm := NewMatWithSize(3, 3, MatTypeCV32F)
	defer tm.Close()
	PerspectiveTransform(src, &dst, tm)
	if dst.Empty() {
		t.Error("PerspectiveTransform error")
	}
}

func TestMatSolve(t *testing.T) {
	a := NewMatWithSize(3, 3, MatTypeCV32F)
	defer a.Close()
	b := NewMatWithSize(3, 1, MatTypeCV32F)
	defer b.Close()
	solve := NewMat()
	defer solve.Close()

	testPoints := []struct {
		x2 float32
		x  float32
		c  float32
		y  float32
	}{
		{x2: 1, x: 1, c: 1, y: 0},
		{x2: 0, x: 0, c: 1, y: 2},
		{x2: 9, x: 3, c: 1, y: 2},
	}

	for row, p := range testPoints {
		a.SetFloatAt(row, 0, p.x2)
		a.SetFloatAt(row, 1, p.x)
		a.SetFloatAt(row, 2, p.c)

		b.SetFloatAt(row, 0, p.y)
	}

	solved := Solve(a, b, &solve, SolveDecompositionLu)

	if !solved {
		t.Errorf("TestMatSolve could not solve linear equations")
	}

	if solve.GetFloatAt(0, 0) != 1 || solve.GetFloatAt(1, 0) != -3 || solve.GetFloatAt(2, 0) != 2 {
		t.Errorf("TestMatSolve incorrect results: got %v expected %v, got %v expected %v, got %v expected %v",
			solve.GetFloatAt(0, 0), 1,
			solve.GetFloatAt(1, 0), -3,
			solve.GetFloatAt(2, 0), 2)
	}
}

func TestSolveCubic(t *testing.T) {
	coeffs := NewMatWithSize(1, 4, MatTypeCV32F)
	defer coeffs.Close()
	roots := NewMat()
	defer roots.Close()

	coeffs.SetFloatAt(0, 0, 2.0)
	coeffs.SetFloatAt(0, 1, 3.0)
	coeffs.SetFloatAt(0, 2, -11.0)
	coeffs.SetFloatAt(0, 3, -6.0)

	rootsCount := SolveCubic(coeffs, &roots)

	expectedRootsCount := 3
	if rootsCount != expectedRootsCount {
		t.Errorf("TestSolveCubic incorrect numbers of roots %d, expected %d", rootsCount, expectedRootsCount)
	}

	if roots.GetFloatAt(0, 0) != -3.0 || roots.GetFloatAt(0, 1) != 2.0 || roots.GetFloatAt(0, 0) != -3.0 {
		t.Errorf("TestSolveCubic incorrect roots: got %f expected %f, got %f expected %f, got %f expected %f",
			roots.GetFloatAt(0, 0), -3.0,
			roots.GetFloatAt(0, 1), -0.5,
			roots.GetFloatAt(0, 0), -3.0)
	}
}

func TestSolvePoly(t *testing.T) {
	coeffs := NewMatWithSize(1, 3, MatTypeCV32F)
	defer coeffs.Close()
	roots := NewMat()
	defer roots.Close()

	// x² - 14x + 49 = 0
	coeffs.SetFloatAt(0, 0, 49.0)
	coeffs.SetFloatAt(0, 1, -14.0)
	coeffs.SetFloatAt(0, 2, 1)

	diffError := SolvePoly(coeffs, &roots, 300)

	diffTolerance := 1.0e-61
	if diffError > diffTolerance {
		t.Errorf("TestSolvePoly was not exact, got an error of %e and should have been less than %f", diffError, diffTolerance)
	}

	if roots.GetFloatAt(0, 0) != 7.0 {
		t.Errorf("TestSolvePoly incorrect roots: got %f expected %f",
			roots.GetFloatAt(0, 0), 7.0)
	}
}

func TestMatReduceToSingleRow(t *testing.T) {
	rows := 2
	cols := 3
	src := NewMatWithSize(rows, cols, MatTypeCV8U)
	defer src.Close()
	dst := NewMat()
	defer dst.Close()

	for row := 0; row < rows; row++ {
		for col := 0; col < cols; col++ {
			src.SetUCharAt(row, col, uint8(col+1))
		}
	}

	Reduce(src, &dst, 0, ReduceSum, MatTypeCV32F)

	sz := dst.Size()
	if sz[0] != 1 && sz[1] != 3 {
		t.Errorf("TestMatReduceToSingleRow incorrect size: %v\n", sz)
	}

	if dst.GetFloatAt(0, 0) != 2 || dst.GetFloatAt(0, 1) != 4 || dst.GetFloatAt(0, 2) != 6 {
		t.Errorf("TestMatReduceToSingleRow incorrect reduce result: %v at (0, 0) expected 2, %v at (0, 1) expected 4, %v at (0, 2) expected 6",
			dst.GetFloatAt(0, 0), dst.GetFloatAt(0, 1), dst.GetFloatAt(0, 2))
	}
}

func TestMatReduceToSingleColumn(t *testing.T) {
	rows := 2
	cols := 3
	src := NewMatWithSize(rows, cols, MatTypeCV8U)
	defer src.Close()
	dst := NewMat()
	defer dst.Close()

	for row := 0; row < rows; row++ {
		for col := 0; col < cols; col++ {
			src.SetUCharAt(row, col, uint8(col+1))
		}
	}

	Reduce(src, &dst, 1, ReduceSum, MatTypeCV32F)

	sz := dst.Size()
	if sz[0] != 3 && sz[1] != 1 {
		t.Errorf("TestMatReduceToSingleColumn incorrect size: %v\n", sz)
	}

	if dst.GetFloatAt(0, 0) != 6 || dst.GetFloatAt(1, 0) != 6 {
		t.Errorf("TestMatReduceToSingleColumn incorrect reduce result: %v at (0, 0) expected 6, %v at (1, 0) expected 6",
			dst.GetFloatAt(0, 0), dst.GetFloatAt(1, 0))
	}
}

func TestRepeat(t *testing.T) {
	rows := 1
	cols := 3
	src := NewMatWithSize(rows, cols, MatTypeCV8U)
	defer src.Close()

	for row := 0; row < rows; row++ {
		for col := 0; col < cols; col++ {
			src.SetUCharAt(row, col, uint8(col))
		}
	}

	dst := NewMat()
	defer dst.Close()
	Repeat(src, 3, 1, &dst)

	size := dst.Size()
	expectedRows := 3
	expectedCols := 3

	if size[0] != expectedRows || size[1] != expectedCols {
		t.Errorf("TestRepeat incorrect size, got y=%d x=%d, expected y=%d x=%d.", size[0], size[1], expectedRows, expectedCols)
	}

	for row := 0; row < expectedRows; row++ {
		for col := 0; col < expectedCols; col++ {

			result := dst.GetUCharAt(row, col)

			if result != uint8(col) {
				t.Errorf("TestRepeat dst at row=%d col=%d should be %d and got %d.", row, col, col, result)
			}
		}
	}
}

func TestScaleAdd(t *testing.T) {
	rows := 2
	cols := 3
	src1 := NewMatWithSize(rows, cols, MatTypeCV64F)
	defer src1.Close()

	for row := 0; row < rows; row++ {
		for col := 0; col < cols; col++ {
			src1.SetDoubleAt(row, col, float64(col))
		}
	}

	src2 := NewMatWithSize(rows, cols, MatTypeCV64F)
	defer src2.Close()

	for row := 0; row < rows; row++ {
		for col := 0; col < cols; col++ {
			src2.SetDoubleAt(row, col, 1.0)
		}
	}

	dst := NewMat()
	defer dst.Close()

	alpha := 1.5
	ScaleAdd(src1, alpha, src2, &dst)

	if dst.Empty() {
		t.Error("TestScaleAdd dst should not be empty.")
	}

	for row := 0; row < rows; row++ {
		for col := 0; col < cols; col++ {
			expected := float64(col)*alpha + 1.0
			result := dst.GetDoubleAt(row, col)
			if result != expected {
				t.Errorf("TestScaleAdd dst at row=%d col=%d should be %f and got %f.", row, col, expected, result)
			}
		}
	}
}

func TestSetIdentity(t *testing.T) {
	rows := 4
	cols := 3
	src := NewMatWithSize(rows, cols, MatTypeCV64F)
	defer src.Close()
	scalar := 2.5
	SetIdentity(src, scalar)

	if src.Empty() {
		t.Error("TestSetIdentity src should not be empty.")
	}

	for row := 0; row < rows; row++ {
		for col := 0; col < cols; col++ {
			result := src.GetDoubleAt(row, col)
			expected := 0.0
			if row == col {
				expected = scalar
			}
			if result != expected {
				t.Errorf("TestSetIdentity src at row=%d col=%d should be %f and got %f.", row, col, expected, result)
			}
		}
	}
}

func TestMatSortEveryRowDescending(t *testing.T) {
	rows := 2
	cols := 3
	src := NewMatWithSize(rows, cols, MatTypeCV8U)
	defer src.Close()

	for row := 0; row < rows; row++ {
		for col := 0; col < cols; col++ {
			src.SetUCharAt(row, col, uint8(col))
		}
	}

	dst := NewMat()
	defer dst.Close()

	flags := SortEveryRow + SortDescending
	Sort(src, &dst, flags)

	if dst.Empty() {
		t.Error("TestMatSortEveryRowDescending dst should not be empty.")
	}

	for row := 0; row < rows; row++ {
		for col := 0; col < cols; col++ {
			expected := cols - col - 1
			result := dst.GetUCharAt(row, col)
			if result != uint8(expected) {
				t.Errorf("TestMatSortEveryRowDescending dst at row=%d col=%d should be %d and got %d.", row, col, expected, result)
			}
		}
	}
}

func TestMatSortIdxEveryRowDescending(t *testing.T) {
	rows := 2
	cols := 3
	src := NewMatWithSize(rows, cols, MatTypeCV8U)
	defer src.Close()

	for row := 0; row < rows; row++ {
		for col := 0; col < cols; col++ {
			src.SetUCharAt(row, col, uint8(col))
		}
	}

	dst := NewMat()
	defer dst.Close()
	flags := SortEveryRow + SortDescending
	SortIdx(src, &dst, flags)

	if dst.Empty() {
		t.Error("TestMatSortIdxEveryRowDescending dst should not be empty.")
	}
}

func TestMatSplit(t *testing.T) {
	src := IMRead("images/face.jpg", 1)
	defer src.Close()
	chans := Split(src)
	if len(chans) != src.Channels() {
		t.Error("Split Channel count differs")
	}
	dst := NewMat()
	defer dst.Close()
	Merge(chans, &dst)
	diff := NewMat()
	defer diff.Close()
	AbsDiff(src, dst, &diff)
	sum := diff.Sum()
	if sum.Val1 != 0 || sum.Val2 != 0 || sum.Val3 != 0 {
		t.Error("Split/Merged images differ")
	}
}

func TestMatSubtract(t *testing.T) {
	src1 := IMRead("images/lut.png", 1)
	defer src1.Close()
	src2 := IMRead("images/lut.png", 1)
	defer src2.Close()
	dst := NewMat()
	defer dst.Close()
	Subtract(src1, src2, &dst)
	sum := dst.Sum()
	if sum.Val1 != 0 || sum.Val2 != 0 || sum.Val3 != 0 {
		t.Error("Sum of Subtracting equal images is not 0")
	}
}

func TestMatTrace(t *testing.T) {
	rows := 3
	cols := 3
	src := NewMatWithSize(rows, cols, MatTypeCV8U)
	defer src.Close()

	// Create and identity eye matrix
	for row := 0; row <= rows; row++ {
		for col := 0; col <= cols; col++ {
			if row == col {
				src.SetUCharAt(row, col, uint8(1))
			}
		}
	}

	trace := Trace(src)
	expected := NewScalar(3, 0, 0, 0)

	if trace.Val1 != expected.Val1 || trace.Val2 != expected.Val2 || trace.Val3 != expected.Val3 || trace.Val4 != expected.Val4 {
		t.Errorf("Trace values should be %v and was %v", expected, trace)
	}
}

func TestMatTransform(t *testing.T) {
	src := IMRead("images/lut.png", 1)
	defer src.Close()
	dst := NewMat()
	defer dst.Close()
	tm := NewMatWithSize(4, 4, MatTypeCV8UC4)
	defer tm.Close()
	Transform(src, &dst, tm)
	if dst.Empty() {
		t.Error("Transform error")
	}
}

func TestMatTranspose(t *testing.T) {
	src := IMRead("images/lut.png", 1)
	defer src.Close()
	dst := NewMat()
	defer dst.Close()
	Transpose(src, &dst)
	if dst.Empty() {
		t.Error("Transpose error")
	}
}

func TestPolarToCart(t *testing.T) {
	magnitude := NewMatWithSize(101, 102, MatTypeCV32F)
	angle := NewMatWithSize(101, 102, MatTypeCV32F)
	x := NewMat()
	y := NewMat()

	PolarToCart(magnitude, angle, &x, &y, false)

	if x.Empty() || y.Empty() {
		t.Error("TestPolarToCart neither x nor y should be empty.")
	}

	x.Close()
	y.Close()
	magnitude.Close()
	angle.Close()
}

func TestMatPow(t *testing.T) {
	src := NewMatWithSize(101, 102, MatTypeCV8U)
	defer src.Close()
	dst := NewMat()
	defer dst.Close()
	power := 2.0
	Pow(src, power, &dst)

	if dst.Empty() {
		t.Error("TestMatPow dest should not be empty.")
	}
}

func TestMatSum(t *testing.T) {
	src := NewMatFromScalar(NewScalar(1, 2, 3, 4), MatTypeCV8UC4)
	defer src.Close()
	sum := src.Sum()
	if sum.Val1 != 1 || sum.Val2 != 2 || sum.Val3 != 3 || sum.Val4 != 4 {
		t.Error("Sum values do not match constructor")
	}
}

func TestTermCriteria(t *testing.T) {
	tc := NewTermCriteria(Count, 50, 2.0)
	if tc.p == nil {
		t.Error("TermCriteria has invalid value")
	}
}

func TestScalar(t *testing.T) {
	s := NewScalar(127.0, 255.0, 64.0, 0.0)
	if s.Val1 != 127.0 || s.Val2 != 255.0 || s.Val3 != 64.0 || s.Val4 != 0.0 {
		t.Error("Scalar has invalid value")
	}
}

func TestToCPoints(t *testing.T) {
	points := []image.Point{
		image.Pt(0, 0),
		image.Pt(1, 1),
	}

	cPoints := toCPoints(points)

	if int(cPoints.length) != len(points) {
		t.Error("Invalid C Points length")
	}
}

func TestToCStrings(t *testing.T) {
	strs := []string{
		"hello",
		"fellow",
		"CStrings",
	}

	cStrs := toCStrings(strs)

	if int(cStrs.length) != len(strs) {
		t.Error("Invalid CStrings length")
	}
}

func TestMatBatchDistance(t *testing.T) {
	src1 := NewMatWithSize(100, 100, MatTypeCV8U)
	src2 := NewMatWithSize(100, 100, MatTypeCV8U)
	mask := NewMatWithSize(100, 100, MatTypeCV8U)
	dist := NewMat()
	nidx := NewMat()
	BatchDistance(src1, src2, dist, -1, nidx, NormL2, 15, mask, 0, false)
	if dist.Empty() {
		t.Error("TestBatchDistance dst should not be empty.")
	}
	src1.Close()
	src2.Close()
	mask.Close()
	dist.Close()
	nidx.Close()
}

func TestMatBorderInterpolate(t *testing.T) {
	n := BorderInterpolate(1, 5, 1)
	if n == 0 {
		t.Error("TestBorderInterpolate dst should not be 0.")
	}
}

func TestMatCalcCovarMatrix(t *testing.T) {
	samples := NewMatWithSize(10, 10, MatTypeCV32F)
	covar := NewMat()
	mean := NewMat()
	CalcCovarMatrix(samples, &covar, &mean, CovarRows, MatTypeCV64F)
	if covar.Empty() {
		t.Error("TestCalcCovarMatrix dst should not be empty.")
	}
	samples.Close()
	covar.Close()
	mean.Close()
}

func TestMatCartToPolar(t *testing.T) {
	x := NewMatWithSize(100, 100, MatTypeCV32F)
	y := NewMatWithSize(100, 100, MatTypeCV32F)
	magnitude := NewMat()
	angle := NewMat()
	CartToPolar(x, y, &magnitude, &angle, false)
	if magnitude.Empty() || angle.Empty() {
		t.Error("TestCartToPolar neither magnitude nor angle should be empty.")
	}
	x.Close()
	y.Close()
	magnitude.Close()
	angle.Close()
}

func TestMatCheckRange(t *testing.T) {
	mat1 := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat1.Close()
	ret := CheckRange(mat1)
	if !ret {
		t.Error("TestCheckRange error.")
	}
}

func TestMatCompleteSymm(t *testing.T) {
	src := NewMatWithSize(100, 100, MatTypeCV32F)
	CompleteSymm(src, false)
	if src.Empty() {
		t.Error("TestCompleteSymm src should not be empty.")
	}
	src.Close()
}

func TestMatConvertScaleAbs(t *testing.T) {
	src := NewMatWithSize(100, 100, MatTypeCV32F)
	dst := NewMat()
	ConvertScaleAbs(src, &dst, 1, 0)
	if dst.Empty() {
		t.Error("TestConvertScaleAbs dst should not be empty.")
	}
	src.Close()
	dst.Close()
}

func TestMatCopyMakeBorder(t *testing.T) {
	src := NewMatWithSize(100, 100, MatTypeCV32F)
	dst := NewMat()
	CopyMakeBorder(src, &dst, 10, 10, 10, 10, BorderReflect, color.RGBA{0, 0, 0, 0})
	if dst.Empty() {
		t.Error("TestCopyMakeBorder dst should not be empty.")
	}
	src.Close()
	dst.Close()
}

func TestMatDeterminant(t *testing.T) {
	mat1 := NewMatWithSize(101, 101, MatTypeCV32F)
	defer mat1.Close()
	ret := Determinant(mat1)
	if ret != 0 {
		t.Error("TestMatDeterminant error.")
	}
}

func TestMatEigen(t *testing.T) {
	src := NewMatWithSize(10, 10, MatTypeCV32F)
	eigenvalues := NewMat()
	eigenvectors := NewMat()
	Eigen(src, &eigenvalues, &eigenvectors)
	if eigenvectors.Empty() || eigenvalues.Empty() {
		t.Error("TestEigen should not have empty eigenvectors or eigenvalues.")
	}
	src.Close()
	eigenvectors.Close()
	eigenvalues.Close()
}

func TestMatEigenNonSymmetric(t *testing.T) {
	src := NewMatWithSizeFromScalar(NewScalar(0.1, 0.1, 0.1, 0.1), 10, 10, MatTypeCV32F)
	eigenvalues := NewMat()
	eigenvectors := NewMat()
	EigenNonSymmetric(src, &eigenvalues, &eigenvectors)
	if eigenvectors.Empty() || eigenvalues.Empty() {
		t.Error("TestEigenNonSymmetric should not have empty eigenvectors or eigenvalues.")
	}
	src.Close()
	eigenvectors.Close()
	eigenvalues.Close()
}

func TestMatExp(t *testing.T) {
	src := NewMatWithSize(10, 10, MatTypeCV32F)
	dst := NewMat()
	Exp(src, &dst)
	if dst.Empty() {
		t.Error("TestExp dst should not be empty.")
	}
	src.Close()
	dst.Close()
}

func TestMatExtractChannel(t *testing.T) {
	src := NewMatWithSize(10, 10, MatTypeCV32F+MatChannels3)
	dst := NewMat()
	ExtractChannel(src, &dst, 1)
	if dst.Empty() {
		t.Error("TestExtractChannel dst should not be empty.")
	}
	src.Close()
	dst.Close()
}

func TestMatFindNonZero(t *testing.T) {
	src := NewMatWithSize(10, 10, MatTypeCV8U)
	defer src.Close()
	src.SetFloatAt(3, 3, 17)
	src.SetFloatAt(4, 4, 17)

	dst := NewMat()
	defer dst.Close()

	FindNonZero(src, &dst)

	if dst.Empty() {
		t.Error("TestMatFindNonZero dst should not be empty.")
	}
	if dst.Rows() != 2*2 {
		t.Error("TestMatFindNonZero didn't find all nonzero locations.")
	}
}

func TestMatFlip(t *testing.T) {
	src := NewMatWithSize(10, 10, MatTypeCV32F)
	defer src.Close()

	dst := NewMat()
	defer dst.Close()

	Flip(src, &dst, 0)

	if dst.Empty() {
		t.Error("TestMatFlip dst should not be empty.")
	}
	if dst.Rows() != src.Rows() {
		t.Error("TestMatFlip src and dst size should be same.")
	}
}

func TestMatPhase(t *testing.T) {
	x := NewMatFromScalar(NewScalar(1.2, 2.3, 3.4, 4.5), MatTypeCV32F)
	defer x.Close()

	y := NewMatFromScalar(NewScalar(5.6, 6.7, 7.8, 8.9), MatTypeCV32F)
	defer y.Close()

	angle := NewMatWithSize(4, 5, MatTypeCV32F)
	defer angle.Close()

	Phase(x, y, &angle, false)

	if angle.Empty() {
		t.Error("TestMatPhase angle should not be empty.")
	}

	if angle.Rows() != x.Rows() {
		t.Error("TestMatPhase x and angle size should be same.")
	}
}

func TestMatGemm(t *testing.T) {
	src1 := NewMatWithSize(3, 4, MatTypeCV32F)
	defer src1.Close()

	src2 := NewMatWithSize(4, 3, MatTypeCV32F)
	defer src2.Close()

	src3 := NewMat()
	defer src3.Close()

	dst := NewMat()
	defer dst.Close()

	Gemm(src1, src2, 1, src3, 0, &dst, 0)

	if dst.Empty() {
		t.Error("Gemm dst should not be empty.")
	}
	if dst.Rows() != src1.Rows() {
		t.Error("Gemm src and dst size should be same.")
	}
}

func TestMatHconcat(t *testing.T) {
	src := NewMatWithSize(10, 10, MatTypeCV32F)
	defer src.Close()

	dst := NewMat()
	defer dst.Close()

	Hconcat(src, src, &dst)

	if dst.Empty() {
		t.Error("TestMatHconcat dst should not be empty.")
	}
	if dst.Cols() != 2*src.Cols() {
		t.Error("TestMatHconcat dst.Cols should be 2 x src.Cols.")
	}
}

func TestMatVconcat(t *testing.T) {
	src := NewMatWithSize(10, 10, MatTypeCV32F)
	defer src.Close()

	dst := NewMat()
	defer dst.Close()

	Vconcat(src, src, &dst)

	if dst.Empty() {
		t.Error("TestMatVconcat dst should not be empty.")
	}
	if dst.Rows() != 2*src.Rows() {
		t.Error("TestMatVconcat dst.Cols should be 2 x src.Rows().")
	}
}

func TestRotate(t *testing.T) {
	src := NewMatWithSize(1, 2, MatTypeCV64F)
	defer src.Close()
	dst := NewMat()
	defer dst.Close()

	Rotate(src, &dst, Rotate90Clockwise)
	if dst.Rows() != 2 {
		t.Errorf("expected rows: %d got %d", src.Cols(), dst.Rows())
	}

	dst2src := NewMat()
	defer dst2src.Close()

	Rotate(dst, &dst2src, Rotate90CounterClockwise)
	if dst2src.Rows() != 1 {
		t.Errorf("expected rows: %d got %d", src.Rows(), dst2src.Rows())
	}
}

func TestMatIdct(t *testing.T) {
	src := NewMatWithSize(4, 4, MatTypeCV32F)
	defer src.Close()

	dst := NewMat()
	defer dst.Close()

	IDCT(src, &dst, 0)
	if dst.Empty() {
		t.Error("Idct dst should not be empty.")
	}
	if dst.Rows() != src.Rows() {
		t.Error("Idct src and dst size should be same.")
	}
}

func TestMatIdft(t *testing.T) {
	src := NewMatWithSize(4, 4, MatTypeCV32F)
	defer src.Close()

	dst := NewMat()
	defer dst.Close()

	IDFT(src, &dst, 0, 0)
	if dst.Empty() {
		t.Error("Idct dst should not be empty.")
	}
	if dst.Rows() != src.Rows() {
		t.Error("Idct src and dst size should be same.")
	}
}

func TestMatInsertChannel(t *testing.T) {
	src := NewMatWithSize(4, 4, MatTypeCV8U)
	defer src.Close()

	dst := NewMatWithSize(4, 4, MatTypeCV8UC3)
	defer dst.Close()

	InsertChannel(src, &dst, 1)
	if dst.Channels() != 3 {
		t.Error("TestMatInsertChannel dst should change the channel count")
	}
}

func TestMatInvert(t *testing.T) {
	src := NewMatWithSize(4, 4, MatTypeCV32F) // only implemented for symm. Mats
	defer src.Close()

	dst := NewMat()
	defer dst.Close()

	Invert(src, &dst, 0)
	if dst.Empty() {
		t.Error("Invert dst should not be empty.")
	}
}

func TestKMeans(t *testing.T) {
	src := NewMatWithSize(4, 4, MatTypeCV32F) // only implemented for symm. Mats
	defer src.Close()

	bestLabels := NewMat()
	defer bestLabels.Close()

	centers := NewMat()
	defer centers.Close()

	criteria := NewTermCriteria(Count, 10, 1.0)
	KMeans(src, 2, &bestLabels, criteria, 2, KMeansRandomCenters, &centers)
	if bestLabels.Empty() {
		t.Error("bla")
	}
}

func TestKMeansPoints(t *testing.T) {
	points := []image.Point{
		image.Pt(0, 0),
		image.Pt(1, 1),
	}
	bestLabels := NewMat()
	defer bestLabels.Close()
	centers := NewMat()
	defer centers.Close()

	criteria := NewTermCriteria(Count, 10, 1.0)
	KMeansPoints(points, 2, &bestLabels, criteria, 2, KMeansRandomCenters, &centers)
	if bestLabels.Empty() || bestLabels.Size()[0] != len(points) {
		t.Error("Labels is not proper")
	}
}

func TestMatLog(t *testing.T) {
	src := NewMatWithSize(4, 3, MatTypeCV32F)
	defer src.Close()

	dst := NewMat()
	defer dst.Close()

	Log(src, &dst)
	if dst.Empty() {
		t.Error("Log dst should not be empty.")
	}
}

func TestMatMagnitude(t *testing.T) {
	src1 := NewMatWithSize(4, 4, MatTypeCV32F)
	defer src1.Close()
	src2 := NewMatWithSize(4, 4, MatTypeCV32F)
	defer src2.Close()

	dst := NewMat()
	defer dst.Close()

	Magnitude(src1, src2, &dst)
	if dst.Empty() {
		t.Error("Magnitude dst should not be empty.")
	}
}

func TestMatMax(t *testing.T) {
	src1 := NewMatWithSize(4, 4, MatTypeCV32F)
	defer src1.Close()
	src2 := NewMatWithSize(4, 4, MatTypeCV32F)
	defer src2.Close()

	dst := NewMat()
	defer dst.Close()

	Max(src1, src2, &dst)
	if dst.Empty() {
		t.Error("Max dst should not be empty.")
	}
}

func TestMatMin(t *testing.T) {
	src1 := NewMatWithSize(4, 4, MatTypeCV32F)
	defer src1.Close()
	src2 := NewMatWithSize(4, 4, MatTypeCV32F)
	defer src2.Close()

	dst := NewMat()
	defer dst.Close()

	Min(src1, src2, &dst)
	if dst.Empty() {
		t.Error("Min dst should not be empty.")
	}
}

func TestMatMinMaxIdx(t *testing.T) {
	src := NewMatWithSize(10, 10, MatTypeCV32F)
	defer src.Close()
	src.SetFloatAt(3, 3, 17)
	src.SetFloatAt(4, 4, 16)

	minVal, maxVal, _, _ := MinMaxIdx(src)

	if minVal != 0 {
		t.Error("TestMatMinMaxIdx minVal should be 0.")
	}
	if maxVal != 17 {
		t.Errorf("TestMatMinMaxIdx maxVal should be 17, was %f", maxVal)
	}
}

func TestMixChannels(t *testing.T) {
	bgra := NewMatWithSizeFromScalar(NewScalar(255, 0, 0, 255), 10, 10, MatTypeCV8UC4)
	defer bgra.Close()
	bgr := NewMatWithSize(bgra.Rows(), bgra.Cols(), MatTypeCV8UC3)
	defer bgr.Close()
	alpha := NewMatWithSize(bgra.Rows(), bgra.Cols(), MatTypeCV8UC1)
	defer alpha.Close()

	dst := []Mat{bgr, alpha}

	// bgra[0] -> bgr[2], bgra[1] -> bgr[1],
	// bgra[2] -> bgr[0], bgra[3] -> alpha[0]
	fromTo := []int{0, 2, 1, 1, 2, 0, 3, 3}

	MixChannels([]Mat{bgra}, dst, fromTo)

	bgrChans := Split(bgr)
	scalarByte := []byte{0, 0, 255}
	for c := 0; c < bgr.Channels(); c++ {
		for i := 0; i < bgr.Rows(); i++ {
			for j := 0; j < bgr.Cols(); j++ {
				if s := bgrChans[c].GetUCharAt(i, j); s != scalarByte[c] {
					t.Errorf("TestMixChannels incorrect bgr scalar: %v\n", s)
				}
			}
		}
	}

	alphaChans := Split(alpha)
	scalarByte = []byte{255}
	for c := 0; c < alpha.Channels(); c++ {
		for i := 0; i < alpha.Rows(); i++ {
			for j := 0; j < alpha.Cols(); j++ {
				if s := alphaChans[c].GetUCharAt(i, j); s != scalarByte[c] {
					t.Errorf("TestMixChannels incorrect alpha scalar: %v\n", s)
				}
			}
		}
	}
}

func TestMatToImage(t *testing.T) {
	mat1 := NewMatWithSize(101, 102, MatTypeCV8UC3)
	defer mat1.Close()

	img, err := mat1.ToImage()
	if err != nil {
		t.Errorf("TestToImage %v.", err)
	}

	if img.Bounds().Dx() != 102 {
		t.Errorf("TestToImage incorrect width got %d.", img.Bounds().Dx())
	}

	if img.Bounds().Dy() != 101 {
		t.Errorf("TestToImage incorrect height got %d.", img.Bounds().Dy())
	}

	mat2 := NewMatWithSize(101, 102, MatTypeCV8UC1)
	defer mat2.Close()

	img, err = mat2.ToImage()
	if err != nil {
		t.Errorf("TestToImage %v.", err)
	}

	mat3 := NewMatWithSize(101, 102, MatTypeCV8UC4)
	defer mat3.Close()

	img, err = mat3.ToImage()
	if err != nil {
		t.Errorf("TestToImage %v.", err)
	}

	matWithUnsupportedType := NewMatWithSize(101, 102, MatTypeCV8S)
	defer matWithUnsupportedType.Close()

	_, err = matWithUnsupportedType.ToImage()
	if err == nil {
		t.Error("TestToImage expected error got nil.")
	}
}

//Tests that image is the same after converting to Mat and back to Image
func TestImageToMatRGBA(t *testing.T) {
	file, err := os.Open("images/gocvlogo.png")
	if err != nil {
		log.Fatal(err)
	}
	defer file.Close()
	img0, _, err := image.Decode(file)
	if err != nil {
		log.Fatal(err)
	}

	mat, err := ImageToMatRGBA(img0)
	if err != nil {
		log.Fatal(err)
	}
	defer mat.Close()
	img1, err := mat.ToImage()
	if err != nil {
		log.Fatal(err)
	}

	if !compareImages(img0, img1) {
		t.Errorf("Image after converting to Mat and back to Image isn't the same")
	}
}

//Tests that image is the same after converting to Mat and back to Image
func TestImageToMatRGB(t *testing.T) {
	file, err := os.Open("images/gocvlogo.jpg")
	if err != nil {
		log.Fatal(err)
	}
	defer file.Close()
	img0, _, err := image.Decode(file)
	if err != nil {
		log.Fatal(err)
	}

	mat, err := ImageToMatRGB(img0)
	if err != nil {
		log.Fatal(err)
	}
	defer mat.Close()
	img1, err := mat.ToImage()
	if err != nil {
		log.Fatal(err)
	}

	if !compareImages(img0, img1) {
		t.Errorf("Image after converting to Mat and back to Image isn't the same")
	}
}

func TestImageGrayToMatGray(t *testing.T) {
	file, err := os.Open("images/gocvlogo.jpg")
	if err != nil {
		log.Fatal(err)
	}
	defer file.Close()
	imgSrc, _, err := image.Decode(file)
	if err != nil {
		log.Fatal(err)
	}
	img0 := image.NewGray(imgSrc.Bounds())
	draw.Draw(img0, imgSrc.Bounds(), imgSrc, image.ZP, draw.Src)

	mat, err := ImageGrayToMatGray(img0)
	if err != nil {
		log.Fatal(err)
	}
	defer mat.Close()
	img1, err := mat.ToImage()
	if err != nil {
		log.Fatal(err)
	}

	if !compareImages(img0, img1) {
		t.Errorf("Image after converting to Mat and back to Image isn't the same")
	}
}

func TestGetVecfAt(t *testing.T) {
	var cases = []struct {
		m            Mat
		expectedSize int
	}{
		{NewMatWithSize(1, 1, MatTypeCV8UC1), 1},
		{NewMatWithSize(1, 1, MatTypeCV8UC2), 2},
		{NewMatWithSize(1, 1, MatTypeCV8UC3), 3},
		{NewMatWithSize(1, 1, MatTypeCV8UC4), 4},
	}

	for _, c := range cases {
		vec := c.m.GetVecfAt(0, 0)
		if len := len(vec); len != c.expectedSize {
			t.Errorf("TestGetVecfAt: expected %d, got: %d.", c.expectedSize, len)
		}
		c.m.Close()
	}
}

func TestGetVeciAt(t *testing.T) {
	var cases = []struct {
		m            Mat
		expectedSize int
	}{
		{NewMatWithSize(1, 1, MatTypeCV8UC1), 1},
		{NewMatWithSize(1, 1, MatTypeCV8UC2), 2},
		{NewMatWithSize(1, 1, MatTypeCV8UC3), 3},
		{NewMatWithSize(1, 1, MatTypeCV8UC4), 4},
	}

	for _, c := range cases {
		vec := c.m.GetVeciAt(0, 0)
		if len := len(vec); len != c.expectedSize {
			t.Errorf("TestGetVeciAt: expected %d, got: %d.", c.expectedSize, len)
		}
		c.m.Close()
	}
}

func TestGetTickFrequencyCount(t *testing.T) {
	freq := GetTickFrequency()
	if freq == 0 {
		t.Error("GetTickFrequency expected non zero.")
	}

	count := GetTickCount()
	if count == 0 {
		t.Error("GetTickCount expected non zero.")
	}
}

func TestMatT(t *testing.T) {
	var q = []float32{1, 3, 2, 4}
	src := NewMatWithSize(2, 2, MatTypeCV32F)
	defer src.Close()
	src.SetFloatAt(0, 0, 1)
	src.SetFloatAt(0, 1, 2)
	src.SetFloatAt(1, 0, 3)
	src.SetFloatAt(1, 1, 4)

	dst := src.T()
	defer dst.Close()

	ret, err := dst.DataPtrFloat32()
	if err != nil {
		t.Error(err)
	}

	for i := 0; i < len(ret); i++ {
		if ret[i] != q[i] {
			t.Errorf("MatT incorrect value: %v\n", ret[i])
		}
	}
}

func compareImages(img0, img1 image.Image) bool {
	bounds0 := img0.Bounds()
	bounds1 := img1.Bounds()
	dx0 := bounds0.Dx()
	dy0 := bounds0.Dy()
	if dx0 != bounds1.Dx() || dy0 != bounds1.Dy() {
		return false
	}
	xMin0 := bounds0.Min.X
	xMin1 := bounds1.Min.X
	yMin0 := bounds0.Min.Y
	yMin1 := bounds1.Min.Y
	for i := 0; i < dx0; i++ {
		for j := 0; j < dy0; j++ {
			point0 := img0.At(xMin0+i, yMin0+j)
			point1 := img1.At(xMin1+i, yMin1+j)
			r0, g0, b0, a0 := point0.RGBA()
			r1, g1, b1, a1 := point1.RGBA()
			r0 >>= 8
			g0 >>= 8
			b0 >>= 8
			a0 >>= 8
			r1 >>= 8
			g1 >>= 8
			b1 >>= 8
			a1 >>= 8
			if r0 != r1 || g0 != g1 || b0 != b1 || a0 != a1 {
				return false
			}
		}
	}

	return true
}

func TestColRowRange(t *testing.T) {
	mat := NewMatWithSize(101, 102, MatTypeCV8U)
	defer mat.Close()
	if mat.Empty() {
		t.Error("TestColRowRange should not be empty")
	}

	if mat.Rows() != 101 {
		t.Errorf("TestColRowRange incorrect row count: %v\n", mat.Rows())
	}

	if mat.Cols() != 102 {
		t.Errorf("TestColRowRange incorrect col count: %v\n", mat.Cols())
	}

	submatRow := mat.RowRange(0, 50)
	defer submatRow.Close()
	if submatRow.Rows() != 50 {
		t.Errorf("TestColRowRange incorrect submatRow count: %v\n", submatRow.Rows())
	}

	submatCols := mat.ColRange(0, 50)
	defer submatCols.Close()
	if submatCols.Cols() != 50 {
		t.Errorf("TestColRowRange incorrect submatCols count: %v\n", submatCols.Cols())
	}
}

func Test_toGoStrings(t *testing.T) {
	goStrings := []string{"foo", "bar"}
	cStrings := toCStrings(goStrings)
	result := toGoStrings(cStrings)
	if len(goStrings) != len(result) {
		t.Errorf("TesttoGoStrings failed: length of converted string is not equal to original \n")
	}
	for i, s := range goStrings {
		if s != result[i] {
			t.Errorf("TesttoGoStrings failed: strings are not equal. expected=%s, actusal=%s", s, result[i])
		}
	}
}