Code files

Chapter02/writing-module-code/modernizing-syntax/hsl-to-hex/test/index.js

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+const hsl = require('../')
+const {test} = require('tap')
+
+test('pure white', ({is, end}) => {
+  const expected = '#ffffff'
+  const actual = hsl(0, 100, 100)
+  const it = `
+    max saturation and luminosity should return pure white
+  `
+  is(actual, expected, it)
+  end()
+})
+
+test('medium gray', ({is, end}) => {
+  const expected = '#808080'
+  const actual = hsl(0, 0, 50)
+  const it = `
+    0% saturation, 50% luminosity should be medium gray
+  `
+  is(actual, expected, it)
+  end()
+})
+
+test('hue', ({is, end}) => {
+  {
+    const expected = '#ff0000'
+    const actual = hsl(0, 100, 50)
+    const it = `
+      0deg should be red
+    `
+    is(actual, expected, it)
+  }
+  {
+    const expected = '#0000ff'
+    const actual = hsl(240, 100, 50)
+    const it = `
+      240deg should be blue
+    `
+    is(actual, expected, it)
+  }
+  {
+    const expected = '#00ffff'
+    const actual = hsl(180, 100, 50)
+    const it = `
+      180deg should be cyan
+    `
+    is(actual, expected, it)
+  }
+  end()
+})
+
+test('degree overflow/underflow', ({is, end}) => {
+  {
+    const expected = hsl(1, 100, 50)
+    const actual = hsl(361, 100, 50)
+    const it = `
+      361deg should be the same as 1deg
+    `
+    is(actual, expected, it)
+  }
+  {
+    const expected = hsl(-1, 100, 50)
+    const actual = hsl(359, 100, 50)
+    const it = `
+      -1deg should be the same as 359deg
+    `
+    is(actual, expected, it)
+  }
+  end()
+})
+
+test('max constraint', ({is, end}) => {
+  {
+    const expected = hsl(0, 101, 50)
+    const actual = hsl(0, 100, 50)
+    const it = `
+      101% should be the same as 100%
+    `
+    is(actual, expected, it)
+  }
+  {
+    const expected = hsl(0, -1, 50)
+    const actual = hsl(0, 0, 50)
+    const it = `
+      -1% should be the same as 0%
+    `
+    is(actual, expected, it)
+  }
+  end()
+})