tailwindcss/__tests__/applyAtRule.test.js at master · ITACC2018/tailwindcss · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
import postcss from 'postcss'
import plugin from '../src/lib/substituteClassApplyAtRules'

function run(input, opts = () => {}) {
  return postcss([plugin(opts)]).process(input, { from: undefined })
}

test("it copies a class's declarations into itself", () => {
  const output = '.a { color: red; } .b { color: red; }'

  return run('.a { color: red; } .b { @apply .a; }').then(result => {
    expect(result.css).toEqual(output)
    expect(result.warnings().length).toBe(0)
  })
})

test('it removes important from applied classes by default', () => {
  const input = `
    .a { color: red !important; }
    .b { @apply .a; }
  `

  const expected = `
    .a { color: red !important; }
    .b { color: red; }
  `

  return run(input).then(result => {
    expect(result.css).toEqual(expected)
    expect(result.warnings().length).toBe(0)
  })
})

test('applied rules can be made !important', () => {
  const input = `
    .a { color: red; }
    .b { @apply .a !important; }
  `

  const expected = `
    .a { color: red; }
    .b { color: red !important; }
  `

  return run(input).then(result => {
    expect(result.css).toEqual(expected)
    expect(result.warnings().length).toBe(0)
  })
})

test('cssnext custom property sets are preserved', () => {
  const input = `
    .a {
      color: red;
    }
    .b {
      @apply .a --custom-property-set;
    }
  `

  const expected = `
    .a {
      color: red;
    }
    .b {
      color: red;
      @apply --custom-property-set;
    }
  `

  return run(input).then(result => {
    expect(result.css).toEqual(expected)
    expect(result.warnings().length).toBe(0)
  })
})

test('it fails if the class does not exist', () => {
  return run('.b { @apply .a; }').catch(e => {
    expect(e).toMatchObject({ name: 'CssSyntaxError' })
  })
})

test('applying classes that are defined in a media query is not supported', () => {
  const input = `
    @media (min-width: 300px) {
      .a { color: blue; }
    }

    .b {
      @apply .a;
    }
  `
  expect.assertions(1)
  return run(input).catch(e => {
    expect(e).toMatchObject({ name: 'CssSyntaxError' })
  })
})

test('applying classes that are ever used in a media query is not supported', () => {
  const input = `
    .a {
      color: red;
    }

    @media (min-width: 300px) {
      .a { color: blue; }
    }

    .b {
      @apply .a;
    }
  `
  expect.assertions(1)
  return run(input).catch(e => {
    expect(e).toMatchObject({ name: 'CssSyntaxError' })
  })
})

test('it does not match classes that include pseudo-selectors', () => {
  const input = `
    .a:hover {
      color: red;
    }

    .b {
      @apply .a;
    }
  `
  expect.assertions(1)
  return run(input).catch(e => {
    expect(e).toMatchObject({ name: 'CssSyntaxError' })
  })
})

test('it does not match classes that have multiple rules', () => {
  const input = `
    .a {
      color: red;
    }

    .b {
      @apply .a;
    }

    .a {
      color: blue;
    }
  `
  expect.assertions(1)
  return run(input).catch(e => {
    expect(e).toMatchObject({ name: 'CssSyntaxError' })
  })
})