Add tests for Maths/IsDivisible

Masa-Shin · Masa-Shin · commit cf5ff92ef984 · 2021-05-05T14:23:50.000+09:00
diff --git a/Maths/test/IsDivisible.test.js b/Maths/test/IsDivisible.test.js
@@ -0,0 +1,39 @@
+import { isDivisible } from '../IsDivisible'
+
+describe('isDivisible', () => {
+  const testCases = [
+    [0, 1, true],
+    [0, 2, true],
+    [1, 1, true],
+    [1, 2, false],
+    [2, 1, true],
+    [4, 4, true],
+    [16, 4, true],
+    [36978235, 5, true],
+    [36978235, 4, false],
+    [4.5, 1.5, true],
+    [4.5, 1.2, false],
+    [5, 0, false],
+    [5, -0, false]
+  ]
+
+  test.each(testCases)("if parameters are (%i, %i) it returns %p", (dividend, divisor, expected) => {
+    expect(isDivisible(dividend, divisor)).toBe(expected);
+  })
+
+  const errorCases = [
+    [NaN, NaN],
+    [NaN, 1],
+    [1, NaN],
+    ["1", 1],
+    [1, "1"],
+    [1, true],
+    [false, 2]
+  ]
+
+  test.each(errorCases)("throws an error if parameters are (%p, %p)", (dividend, divisor) => {
+    expect(() => {
+      isDivisible(dividend, divisor)
+    }).toThrow()
+  })
+})
