test: write unit tests for timing function

Author: JCPedroza

lib/time.test.js

@@ -0,0 +1,49 @@
+const assert = require('node:assert/strict')
+const { describe, it, test } = require('node:test')
+const { pow } = Math
+
+const { timeRepo } = require('./time')
+
+const mockFun1 = (a, b, c) => a * a * b * b * c * c
+const mockFun2 = (a, b, c) => a ** 2 * b ** 2 * c ** 2
+const mockFun3 = (a, b, c) => pow(a, 2) * pow(b, 2) * pow(c, 2)
+
+const mockAlg1 = { fun: mockFun1, id: 'mock function 1' }
+const mockAlg2 = { fun: mockFun2, id: 'mock function 2' }
+const mockAlg3 = { fun: mockFun3, id: 'mock function 3' }
+
+describe('Mock algorithms', () => {
+  test('return the same value', () => {
+    const a = 4
+    const b = -5
+    const c = 7
+
+    const mock1 = mockAlg1.fun(a, b, c)
+    const mock2 = mockAlg2.fun(a, b, c)
+    const mock3 = mockAlg3.fun(a, b, c)
+
+    assert(mock1 === mock2 && mock2 === mock3)
+  })
+})
+
+describe('Timing function', () => {
+  const algos = [mockAlg1, mockAlg2, mockAlg3]
+  const args = [-3, 6, -9]
+
+  it('sorts results in ascending order', () => {
+    const runs = 20
+    const { sortedTimes } = timeRepo(algos, args, runs, 'unit test order')
+
+    for (let idx = 0; idx < sortedTimes.length - 1; idx++) {
+      assert(sortedTimes[idx][1] <= sortedTimes[idx + 1][1])
+    }
+  })
+
+  it('throws if "runs" is less than 1', () => {
+    const runs = 0
+    assert.throws(
+      () => timeRepo(algos, args, runs, 'unit test throw'),
+      RangeError
+    )
+  })
+})