test: add hexToRGB test (#25)

test/hex-to-rgb.test.ts

@@ -0,0 +1,62 @@
+import { expect } from 'chai'
+
+import { hexToRGB, RGB } from '../src'
+
+describe('hexToRGB', function(): void {
+  const valid = [
+    { color: '#000000', expected: { r: 0x00, g: 0x00, b: 0x00 } },
+    { color: '#0acdc0', expected: { r: 0x0a, g: 0xcd, b: 0xc0 } },
+    { color: '#AC00DC', expected: { r: 0xac, g: 0x00, b: 0xdc } },
+    { color: '#09afAF', expected: { r: 0x09, g: 0xaf, b: 0xaf } },
+    { color: '#000', expected: { r: 0x00, g: 0x00, b: 0x00 } },
+    { color: '#0ac', expected: { r: 0x00, g: 0xaa, b: 0xcc } },
+    { color: '#0DC', expected: { r: 0x00, g: 0xdd, b: 0xcc } },
+    { color: '#09a', expected: { r: 0x00, g: 0x99, b: 0xaa } },
+    { color: '#fAF', expected: { r: 0xff, g: 0xaa, b: 0xff } },
+  ]
+  valid.push(
+    // without #
+    ...valid.map(({ color, expected }): { color: string; expected: RGB } => ({ color: color.slice(1), expected }))
+  )
+
+  const invalid = [
+    // 5 or 2 digits
+    ...valid.map(({ color }): string => color.slice(0, -1)),
+    // 4 or 1 digit
+    ...valid.map(({ color }): string => color.slice(0, -2)),
+    // 7 or 4 digits
+    ...valid.map(({ color }): string => color + '0'),
+    // 8 or 5 digits
+    ...valid.map(({ color }): string => color + 'Fa'),
+    ' #000000',
+    ' ',
+    '##abc',
+    '#000 ',
+    '#ABC is a color',
+    '#abc-ef',
+    '#Ř0AABB',
+    '',
+    '0',
+    'false',
+    'garbage',
+    'orange',
+    'the color is #00AAAA',
+    'true',
+  ]
+
+  describe('Valid', function(): void {
+    valid.forEach(({ color, expected }): void => {
+      it(color, function(): void {
+        expect(hexToRGB(color)).to.be.deep.equal(expected)
+      })
+    })
+  })
+
+  describe('Invalid', function(): void {
+    invalid.forEach((color): void => {
+      it(color, function(): void {
+        expect(hexToRGB(color)).to.be.null
+      })
+    })
+  })
+})