/
no-large-snapshots.test.js
173 lines (157 loc) · 4.41 KB
/
no-large-snapshots.test.js
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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
'use strict';
const RuleTester = require('eslint').RuleTester;
const rule = require('../no-large-snapshots');
const noLargeSnapshots = rule.create;
const ruleTester = new RuleTester({
parserOptions: {
ecmaVersion: 2015,
},
});
ruleTester.run('no-large-snapshots', rule, {
valid: [
{
filename: 'mock.js',
code: `expect(something).toMatchInlineSnapshot(\`\n${'line\n'.repeat(
2
)}\`);`,
},
{
filename: 'mock.js',
code: `expect(something).toThrowErrorMatchingInlineSnapshot(\`\n${'line\n'.repeat(
2
)}\`);`,
},
],
invalid: [
{
filename: 'mock.js',
code: `expect(something).toMatchInlineSnapshot(\`\n${'line\n'.repeat(
50
)}\`);`,
errors: [
{
message:
'Expected Jest snapshot to be smaller than 50 lines but was 51 lines long',
},
],
},
{
filename: 'mock.js',
code: `expect(something).toThrowErrorMatchingInlineSnapshot(\`\n${'line\n'.repeat(
50
)}\`);`,
errors: [
{
message:
'Expected Jest snapshot to be smaller than 50 lines but was 51 lines long',
},
],
},
],
});
// was not able to use https://eslint.org/docs/developer-guide/nodejs-api#ruletester for these because there is no way to configure RuleTester to run non .js files
describe('no-large-snapshots', () => {
it('should return an empty object for non snapshot files', () => {
const mockContext = {
getFilename: () => 'mock-component.jsx',
options: [],
};
const result = noLargeSnapshots(mockContext);
expect(result).toEqual({});
});
it('should return an object with an ExpressionStatement function for snapshot files', () => {
const mockContext = {
getFilename: () => 'mock-component.jsx.snap',
options: [],
};
const result = noLargeSnapshots(mockContext);
expect(result).toMatchObject({
ExpressionStatement: expect.any(Function),
});
});
describe('ExpressionStatement function', () => {
it('should report if node has more than 50 lines of code and no sizeThreshold option is passed', () => {
const mockReport = jest.fn();
const mockContext = {
getFilename: () => 'mock-component.jsx.snap',
options: [],
report: mockReport,
};
const mockNode = {
loc: {
start: {
line: 1,
},
end: {
line: 53,
},
},
};
noLargeSnapshots(mockContext).ExpressionStatement(mockNode);
expect(mockReport).toHaveBeenCalledTimes(1);
expect(mockReport.mock.calls[0]).toMatchSnapshot();
});
it('should report if node has more lines of code than number given in sizeThreshold option', () => {
const mockReport = jest.fn();
const mockContext = {
getFilename: () => 'mock-component.jsx.snap',
options: [{ maxSize: 70 }],
report: mockReport,
};
const mockNode = {
loc: {
start: {
line: 20,
},
end: {
line: 103,
},
},
};
noLargeSnapshots(mockContext).ExpressionStatement(mockNode);
expect(mockReport).toHaveBeenCalledTimes(1);
expect(mockReport.mock.calls[0]).toMatchSnapshot();
});
it('should report if maxSize is zero', () => {
const mockReport = jest.fn();
const mockContext = {
getFilename: () => 'mock-component.jsx.snap',
options: [{ maxSize: 0 }],
report: mockReport,
};
const mockNode = {
loc: {
start: {
line: 1,
},
end: {
line: 2,
},
},
};
noLargeSnapshots(mockContext).ExpressionStatement(mockNode);
expect(mockReport).toHaveBeenCalledTimes(1);
expect(mockReport.mock.calls[0]).toMatchSnapshot();
});
it('should not report if node has fewer lines of code than limit', () => {
const mockReport = jest.fn();
const mockContext = {
getFilename: () => 'mock-component.jsx.snap',
options: [],
report: mockReport,
};
const mockNode = {
loc: {
start: {
line: 1,
},
end: {
line: 18,
},
},
};
noLargeSnapshots(mockContext).ExpressionStatement(mockNode);
expect(mockReport).not.toHaveBeenCalled();
});
});
});