Add initial test suite for processPlugins

Author: adamwathan

__tests__/processPlugins.test.js

@@ -0,0 +1,252 @@
+import _ from 'lodash'
+import postcss from 'postcss'
+import processPlugins from '../src/util/processPlugins'
+
+function css(nodes) {
+  return postcss.root({ nodes }).toString()
+}
+
+function objectFitPlugin(variants = []) {
+  return function ({ rule, addUtilities }) {
+    addUtilities([
+      rule('.object-fill', {
+        'object-fit': 'fill',
+      }),
+      rule('.object-contain', {
+        'object-fit': 'contain',
+      }),
+      rule('.object-cover', {
+        'object-fit': 'cover',
+      }),
+    ], variants)
+  }
+}
+
+function buttonPlugin() {
+  return function ({ rule, atRule, addComponents }) {
+    addComponents([
+      rule('.btn-blue', {
+        'background-color': 'blue',
+        'color': 'white',
+        'padding': '.5rem 1rem',
+        'border-radius': '.25rem',
+      }),
+      rule('.btn-blue:hover', {
+        'background-color': 'darkblue',
+      }),
+    ])
+  }
+}
+
+function containerPlugin() {
+  return function ({ rule, atRule, addComponents }) {
+    addComponents([
+      rule('.container', {
+        'width': '100%',
+      }),
+      atRule('@media (min-width: 100px)', [
+        rule('.container', {
+          'max-width': '100px',
+        }),
+      ]),
+      atRule('@media (min-width: 200px)', [
+        rule('.container', {
+          'max-width': '200px',
+        }),
+      ]),
+      atRule('@media (min-width: 300px)', [
+        rule('.container', {
+          'max-width': '300px',
+        }),
+      ])
+    ])
+  }
+}
+
+test('plugins can create utilities', () => {
+  const config = {
+    plugins: [
+      objectFitPlugin()
+    ]
+  }
+
+  const [components, utilities] = processPlugins(config)
+
+  expect(components.length).toBe(0)
+  expect(css(utilities)).toMatchCss(`
+    @variants {
+      .object-fill {
+        object-fit: fill
+      }
+      .object-contain {
+        object-fit: contain
+      }
+      .object-cover {
+        object-fit: cover
+      }
+    }
+  `)
+})
+
+test('plugins can create utilities with variants', () => {
+  const config = {
+    plugins: [
+      objectFitPlugin(['responsive', 'hover', 'group-hover', 'focus'])
+    ]
+  }
+
+  const [components, utilities] = processPlugins(config)
+
+  expect(components.length).toBe(0)
+  expect(css(utilities)).toMatchCss(`
+    @variants responsive, hover, group-hover, focus {
+      .object-fill {
+        object-fit: fill
+      }
+      .object-contain {
+        object-fit: contain
+      }
+      .object-cover {
+        object-fit: cover
+      }
+    }
+  `)
+})
+
+test('plugins can create components', () => {
+  const config = {
+    plugins: [
+      buttonPlugin()
+    ]
+  }
+
+  const [components, utilities] = processPlugins(config)
+
+  expect(utilities.length).toBe(0)
+  expect(css(components)).toMatchCss(`
+    .btn-blue {
+      background-color: blue;
+      color: white;
+      padding: .5rem 1rem;
+      border-radius: .25rem
+    }
+    .btn-blue:hover {
+      background-color: darkblue
+    }
+  `)
+})
+
+test('plugins can create components with media queries', () => {
+  const config = {
+    plugins: [
+      containerPlugin()
+    ]
+  }
+
+  const [components, utilities] = processPlugins(config)
+
+  expect(utilities.length).toBe(0)
+  expect(css(components)).toMatchCss(`
+    .container {
+      width: 100%
+    }
+    @media (min-width: 100px) {
+      .container {
+        max-width: 100px
+      }
+    }
+    @media (min-width: 200px) {
+      .container {
+        max-width: 200px
+      }
+    }
+    @media (min-width: 300px) {
+      .container {
+        max-width: 300px
+      }
+    }
+  `)
+})
+
+test('plugins can create rules with escaped selectors', () => {
+  const config = {
+    plugins: [
+      function ({ e, rule, addUtilities }) {
+        addUtilities([
+          rule(`.${e('top-1/4')}`, {
+            top: '25%',
+          })
+        ], [])
+      }
+    ]
+  }
+
+  const [components, utilities] = processPlugins(config)
+
+  expect(components.length).toBe(0)
+  expect(css(utilities)).toMatchCss(`
+    @variants {
+      .top-1\\/4 {
+        top: 25%
+      }
+    }
+  `)
+})
+
+test('plugins can access the current config', () => {
+  const config = {
+    screens: {
+      'sm': '576px',
+      'md': '768px',
+      'lg': '992px',
+      'xl': '1200px',
+    },
+    plugins: [
+      function ({ rule, atRule, addComponents, config }) {
+        const containerClasses = [
+          rule('.container', {
+            'width': '100%',
+          })
+        ]
+
+        _.forEach(config.screens, (breakpoint) => {
+          const mediaQuery = atRule(`@media (min-width: ${breakpoint})`, [
+            rule('.container', { 'max-width': breakpoint })
+          ])
+          containerClasses.push(mediaQuery)
+        })
+
+        addComponents(containerClasses)
+      }
+    ]
+  }
+
+  const [components, utilities] = processPlugins(config)
+
+  expect(utilities.length).toBe(0)
+  expect(css(components)).toMatchCss(`
+    .container {
+      width: 100%
+    }
+    @media (min-width: 576px) {
+      .container {
+        max-width: 576px
+      }
+    }
+    @media (min-width: 768px) {
+      .container {
+        max-width: 768px
+      }
+    }
+    @media (min-width: 992px) {
+      .container {
+        max-width: 992px
+      }
+    }
+    @media (min-width: 1200px) {
+      .container {
+        max-width: 1200px
+      }
+    }
+  `)
+})