diff --git a/bugs_test.go b/bugs_test.go
index 20d2188..7dade6d 100644
--- a/bugs_test.go
+++ b/bugs_test.go
@@ -2,10 +2,11 @@ package polyclip_test
 
 import (
 	"fmt"
-	"github.com/akavel/polyclip-go"
 	"sort"
 	. "testing"
 	"time"
+
+	"github.com/akavel/polyclip-go"
 )
 
 type sorter polyclip.Polygon
@@ -122,7 +123,7 @@ func TestBug4(t *T) {
 	}
 
 	cases := []struct{ subject, clipping, result polyclip.Polygon }{
-		// original reported github issue #4, resulting in infinte loop
+		// original reported github issue #4, resulting in infinite loop
 		{
 			subject: polyclip.Polygon{{
 				{1.427255375e+06, -2.3283064365386963e-10},
@@ -134,7 +135,6 @@ func TestBug4(t *T) {
 				{1.428e+06, 0},
 				{1.416e+06, 0},
 				{1.416e+06, -12000}}},
-			result: polyclip.Polygon{},
 		},
 	}
 	for _, c := range cases {
@@ -145,17 +145,48 @@ func TestBug4(t *T) {
 			ch <- c.subject.Construct(polyclip.UNION, c.clipping)
 		}()
 
-		var result polyclip.Polygon
 		select {
-		case result = <-ch:
+		case <-ch:
 		case <-time.After(1 * time.Second):
 			// panicking in attempt to get full stacktrace
 			panic(fmt.Sprintf("case UNION:\nsubject:  %v\nclipping: %v\ntimed out.", c.subject, c.clipping))
 		}
-		s := dump(result)
-		if s != dump(c.result) {
-			t.Errorf("case UNION:\nsubject:  %v\nclipping: %v\nexpected: %v\ngot:      %v",
-				c.subject, c.clipping, c.result, s)
+	}
+}
+
+func TestBug5(t *T) {
+	rect := polyclip.Polygon{{{24, 7}, {36, 7}, {36, 23}, {24, 23}}}
+	circle := polyclip.Polygon{{{24, 7}, {24.83622770614123, 7.043824837053814}, {25.66329352654208, 7.174819194129555}, {26.472135954999587, 7.391547869638773}, {27.253893144606412, 7.691636338859195}, {28.00000000000001, 8.071796769724493}, {28.702282018339798, 8.527864045000424}, {29.35304485087088, 9.054841396180851}, {29.94515860381917, 9.646955149129141}, {30.472135954999597, 10.297717981660224}, {30.92820323027553, 11.00000000000001}, {31.308363661140827, 11.746106855393611}, {31.60845213036125, 12.527864045000435}, {31.825180805870467, 13.33670647345794}, {31.95617516294621, 14.16377229385879}, {32.00000000000002, 15.00000000000002}, {31.95617516294621, 15.83622770614125}, {31.825180805870467, 16.6632935265421}, {31.60845213036125, 17.472135954999604}, {31.308363661140827, 18.25389314460643}, {30.92820323027553, 19.00000000000003}, {30.472135954999597, 19.702282018339815}, {29.94515860381917, 20.353044850870898}, {29.35304485087088, 20.945158603819188}, {28.702282018339798, 21.472135954999615}, {28.00000000000001, 21.928203230275546}, {27.253893144606412, 22.308363661140845}, {26.472135954999587, 22.608452130361268}, {25.66329352654208, 22.825180805870485}, {24.83622770614123, 22.956175162946227}, {24, 23.00000000000004}, {23.16377229385877, 22.956175162946227}, {22.33670647345792, 22.825180805870485}, {21.527864045000413, 22.608452130361268}, {20.746106855393588, 22.308363661140845}, {19.99999999999999, 21.928203230275546}, {19.297717981660202, 21.472135954999615}, {18.64695514912912, 20.945158603819188}, {18.05484139618083, 20.353044850870898}, {17.527864045000403, 19.702282018339815}, {17.07179676972447, 19.00000000000003}, {16.691636338859173, 18.25389314460643}, {16.39154786963875, 17.472135954999604}, {16.174819194129533, 16.6632935265421}, {16.04382483705379, 15.83622770614125}, {15.999999999999977, 15.00000000000002}, {16.04382483705379, 14.16377229385879}, {16.174819194129533, 13.33670647345794}, {16.39154786963875, 12.527864045000435}, {16.691636338859173, 11.746106855393611}, {17.07179676972447, 11.00000000000001}, {17.527864045000403, 10.297717981660224}, {18.05484139618083, 9.646955149129141}, {18.64695514912912, 9.054841396180851}, {19.297717981660202, 8.527864045000424}, {19.99999999999999, 8.071796769724493}, {20.746106855393588, 7.691636338859194}, {21.527864045000413, 7.391547869638772}, {22.33670647345792, 7.1748191941295545}, {23.16377229385877, 7.043824837053813}}}
+
+	expected := []struct {
+		op     polyclip.Op
+		result polyclip.Polygon
+	}{
+		{
+			polyclip.UNION,
+			polyclip.Polygon{{{36, 23}, {36, 7}, {24, 7}, {23.16377229385877, 7.043824837053813}, {22.33670647345792, 7.1748191941295545}, {21.527864045000413, 7.391547869638772}, {20.746106855393588, 7.691636338859194}, {19.99999999999999, 8.071796769724493}, {19.297717981660202, 8.527864045000424}, {18.64695514912912, 9.054841396180851}, {18.05484139618083, 9.646955149129141}, {17.527864045000403, 10.297717981660224}, {17.07179676972447, 11.00000000000001}, {16.691636338859173, 11.746106855393611}, {16.39154786963875, 12.527864045000435}, {16.174819194129533, 13.33670647345794}, {16.04382483705379, 14.16377229385879}, {15.999999999999977, 15.00000000000002}, {16.04382483705379, 15.83622770614125}, {16.174819194129533, 16.6632935265421}, {16.39154786963875, 17.472135954999604}, {16.691636338859173, 18.25389314460643}, {17.07179676972447, 19.00000000000003}, {17.527864045000403, 19.702282018339815}, {18.05484139618083, 20.353044850870898}, {18.64695514912912, 20.945158603819188}, {19.297717981660202, 21.472135954999615}, {19.99999999999999, 21.928203230275546}, {20.746106855393588, 22.308363661140845}, {21.527864045000413, 22.608452130361268}, {22.33670647345792, 22.825180805870485}, {23.16377229385877, 22.956175162946227}, {24, 23.00000000000004}, {24.000000000000746, 23}}},
+		},
+		{
+			polyclip.INTERSECTION,
+			polyclip.Polygon{{{31.95617516294621, 15.83622770614125}, {31.825180805870467, 16.6632935265421}, {31.60845213036125, 17.472135954999604}, {31.308363661140827, 18.25389314460643}, {30.92820323027553, 19.00000000000003}, {30.472135954999597, 19.702282018339815}, {29.94515860381917, 20.353044850870898}, {29.35304485087088, 20.945158603819188}, {28.702282018339798, 21.472135954999615}, {28.00000000000001, 21.928203230275546}, {27.253893144606412, 22.308363661140845}, {26.472135954999587, 22.608452130361268}, {25.66329352654208, 22.825180805870485}, {24.83622770614123, 22.956175162946227}, {24.000000000000746, 23}, {24, 23}, {24, 7}, {24.83622770614123, 7.043824837053814}, {25.66329352654208, 7.174819194129555}, {26.472135954999587, 7.391547869638773}, {27.253893144606412, 7.691636338859195}, {28.00000000000001, 8.071796769724493}, {28.702282018339798, 8.527864045000424}, {29.35304485087088, 9.054841396180851}, {29.94515860381917, 9.646955149129141}, {30.472135954999597, 10.297717981660224}, {30.92820323027553, 11.00000000000001}, {31.308363661140827, 11.746106855393611}, {31.60845213036125, 12.527864045000435}, {31.825180805870467, 13.33670647345794}, {31.95617516294621, 14.16377229385879}, {32.00000000000002, 15.00000000000002}}},
+		},
+		{
+			polyclip.DIFFERENCE,
+			polyclip.Polygon{{{24.000000000000746, 23}, {24.83622770614123, 22.956175162946227}, {25.66329352654208, 22.825180805870485}, {26.472135954999587, 22.608452130361268}, {27.253893144606412, 22.308363661140845}, {28.00000000000001, 21.928203230275546}, {28.702282018339798, 21.472135954999615}, {29.35304485087088, 20.945158603819188}, {29.94515860381917, 20.353044850870898}, {30.472135954999597, 19.702282018339815}, {30.92820323027553, 19.00000000000003}, {31.308363661140827, 18.25389314460643}, {31.60845213036125, 17.472135954999604}, {31.825180805870467, 16.6632935265421}, {31.95617516294621, 15.83622770614125}, {32.00000000000002, 15.00000000000002}, {31.95617516294621, 14.16377229385879}, {31.825180805870467, 13.33670647345794}, {31.60845213036125, 12.527864045000435}, {31.308363661140827, 11.746106855393611}, {30.92820323027553, 11.00000000000001}, {30.472135954999597, 10.297717981660224}, {29.94515860381917, 9.646955149129141}, {29.35304485087088, 9.054841396180851}, {28.702282018339798, 8.527864045000424}, {28.00000000000001, 8.071796769724493}, {27.253893144606412, 7.691636338859195}, {26.472135954999587, 7.391547869638773}, {25.66329352654208, 7.174819194129555}, {24.83622770614123, 7.043824837053814}, {24, 7}, {36, 7}, {36, 23}}},
+		},
+		{
+			polyclip.XOR,
+			polyclip.Polygon{
+				{{24.000000000000746, 23}, {24, 23}, {24, 7}, {23.16377229385877, 7.043824837053813}, {22.33670647345792, 7.1748191941295545}, {21.527864045000413, 7.391547869638772}, {20.746106855393588, 7.691636338859194}, {19.99999999999999, 8.071796769724493}, {19.297717981660202, 8.527864045000424}, {18.64695514912912, 9.054841396180851}, {18.05484139618083, 9.646955149129141}, {17.527864045000403, 10.297717981660224}, {17.07179676972447, 11.00000000000001}, {16.691636338859173, 11.746106855393611}, {16.39154786963875, 12.527864045000435}, {16.174819194129533, 13.33670647345794}, {16.04382483705379, 14.16377229385879}, {15.999999999999977, 15.00000000000002}, {16.04382483705379, 15.83622770614125}, {16.174819194129533, 16.6632935265421}, {16.39154786963875, 17.472135954999604}, {16.691636338859173, 18.25389314460643}, {17.07179676972447, 19.00000000000003}, {17.527864045000403, 19.702282018339815}, {18.05484139618083, 20.353044850870898}, {18.64695514912912, 20.945158603819188}, {19.297717981660202, 21.472135954999615}, {19.99999999999999, 21.928203230275546}, {20.746106855393588, 22.308363661140845}, {21.527864045000413, 22.608452130361268}, {22.33670647345792, 22.825180805870485}, {23.16377229385877, 22.956175162946227}, {24, 23.00000000000004}},
+				{{24.000000000000746, 23}, {24.83622770614123, 22.956175162946227}, {25.66329352654208, 22.825180805870485}, {26.472135954999587, 22.608452130361268}, {27.253893144606412, 22.308363661140845}, {28.00000000000001, 21.928203230275546}, {28.702282018339798, 21.472135954999615}, {29.35304485087088, 20.945158603819188}, {29.94515860381917, 20.353044850870898}, {30.472135954999597, 19.702282018339815}, {30.92820323027553, 19.00000000000003}, {31.308363661140827, 18.25389314460643}, {31.60845213036125, 17.472135954999604}, {31.825180805870467, 16.6632935265421}, {31.95617516294621, 15.83622770614125}, {32.00000000000002, 15.00000000000002}, {31.95617516294621, 14.16377229385879}, {31.825180805870467, 13.33670647345794}, {31.60845213036125, 12.527864045000435}, {31.308363661140827, 11.746106855393611}, {30.92820323027553, 11.00000000000001}, {30.472135954999597, 10.297717981660224}, {29.94515860381917, 9.646955149129141}, {29.35304485087088, 9.054841396180851}, {28.702282018339798, 8.527864045000424}, {28.00000000000001, 8.071796769724493}, {27.253893144606412, 7.691636338859195}, {26.472135954999587, 7.391547869638773}, {25.66329352654208, 7.174819194129555}, {24.83622770614123, 7.043824837053814}, {24, 7}, {36, 7}, {36, 23}},
+			},
+		},
+	}
+
+	for _, e := range expected {
+		result := rect.Construct(e.op, circle)
+		if dump(result) != dump(e.result) {
+			t.Errorf("case %d expected:\n%v\ngot:\n%v", e.op, dump(e.result), dump(result))
 		}
 	}
 }