forked from jestjs/jest
/
printSnapshot.test.ts
1417 lines (1244 loc) · 39.5 KB
/
printSnapshot.test.ts
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import ansiRegex = require('ansi-regex');
import styles = require('ansi-styles');
import chalk = require('chalk');
import type {SyncExpectationResult} from 'expect';
import format from 'pretty-format';
import {
Context,
toMatchInlineSnapshot,
toMatchSnapshot,
toThrowErrorMatchingInlineSnapshot,
toThrowErrorMatchingSnapshot,
} from '../';
import type SnapshotState from '../State';
import {
aBackground2,
aBackground3,
aForeground2,
aForeground3,
bBackground2,
bBackground3,
bForeground2,
bForeground3,
} from '../colors';
import {
getReceivedColorForChalkInstance,
getSnapshotColorForChalkInstance,
noColor,
printPropertiesAndReceived,
printSnapshotAndReceived,
} from '../printSnapshot';
import {serialize} from '../utils';
const aOpenForeground1 = styles.magenta.open;
const aOpenBackground1 = styles.bgYellowBright.open;
const bOpenForeground1 = styles.cyan.open;
const bOpenBackground1 = styles.bgWhiteBright.open;
const aOpenForeground2 = styles.color.ansi256(aForeground2);
const bOpenForeground2 = styles.color.ansi256(bForeground2);
const aOpenBackground2 = styles.bgColor.ansi256(aBackground2);
const bOpenBackground2 = styles.bgColor.ansi256(bBackground2);
const aOpenForeground3 = styles.color.ansi16m(
aForeground3[0],
aForeground3[1],
aForeground3[2],
);
const bOpenForeground3 = styles.color.ansi16m(
bForeground3[0],
bForeground3[1],
bForeground3[2],
);
const aOpenBackground3 = styles.bgColor.ansi16m(
aBackground3[0],
aBackground3[1],
aBackground3[2],
);
const bOpenBackground3 = styles.bgColor.ansi16m(
bBackground3[0],
bBackground3[1],
bBackground3[2],
);
const convertAnsi = (val: string): string => {
// Trailing spaces in common lines have yellow background color.
let isYellowBackground = false;
return val.replace(ansiRegex(), match => {
switch (match) {
case styles.inverse.open:
return '<i>';
case styles.inverse.close:
return '</i>';
case styles.bold.open:
return '<b>';
case styles.dim.open:
return '<d>';
case styles.bold.close:
case styles.dim.close:
return '</>';
case styles.green.open:
return '<g>';
case aOpenForeground1:
case aOpenForeground2:
case aOpenForeground3:
return '<m>';
case styles.red.open:
return '<r>';
case bOpenForeground1:
case bOpenForeground2:
case bOpenForeground3:
return '<t>'; // teal/cyan/aqua
case styles.yellow.open:
return '<y>';
case styles.cyan.close:
case styles.green.close:
case styles.magenta.close:
case styles.red.close:
case styles.yellow.close:
return '</>';
case styles.bgYellow.open:
isYellowBackground = true;
return '<Y>';
case aOpenBackground1:
case bOpenBackground1:
case aOpenBackground2:
case bOpenBackground2:
case aOpenBackground3:
case bOpenBackground3:
isYellowBackground = false;
return '';
case styles.bgYellow.close:
// The same code closes any background color.
return isYellowBackground ? '</Y>' : '';
default:
return match;
}
});
};
expect.addSnapshotSerializer({
serialize(val: string): string {
return convertAnsi(val);
},
test(val: unknown): val is string {
return typeof val === 'string';
},
});
describe('chalk', () => {
// Because these tests give code coverage of get functions
// and give confidence that the escape sequences are correct,
// convertAnsi can return same serialization for any chalk level
// so snapshot tests pass in any environment with chalk level >= 1.
// Simulate comparison lines from printSnapshotAndReceived.
const formatLines = (chalkInstance: chalk.Chalk) => {
const aColor = getSnapshotColorForChalkInstance(chalkInstance);
const bColor = getReceivedColorForChalkInstance(chalkInstance);
const cColor = chalkInstance.dim;
const changeLineTrailingSpaceColor = noColor;
const commonLineTrailingSpaceColor = chalkInstance.bgYellow;
return [
aColor(`- delete 1${changeLineTrailingSpaceColor(' ')}`),
cColor(` common 2${commonLineTrailingSpaceColor(' ')}`),
bColor('+ insert 0'),
].join('\n');
};
const expected0 = '- delete 1 \n common 2 \n+ insert 0';
const expected1 =
'<m>- delete 1 </>\n<d> common 2<Y> </Y></>\n<t>+ insert 0</>';
test('level 0', () => {
const chalkInstance = new chalk.Instance({level: 0});
const formatted = formatLines(chalkInstance);
const converted = convertAnsi(formatted);
expect(converted).toBe(expected0);
expect(formatted).toBe(expected0);
});
test('level 1', () => {
const chalkInstance = new chalk.Instance({level: 1});
const formatted = formatLines(chalkInstance);
const converted = convertAnsi(formatted);
expect(converted).toBe(expected1);
expect(formatted).toMatch(`${aOpenForeground1 + aOpenBackground1}-`);
expect(formatted).toMatch(`${bOpenForeground1 + bOpenBackground1}+`);
expect(formatted).not.toMatch(chalkInstance.bgYellow(' ')); // noColor
expect(formatted).toMatch(chalkInstance.bgYellow(' '));
});
test('level 2', () => {
const chalkInstance = new chalk.Instance({level: 2});
const formatted = formatLines(chalkInstance);
const converted = convertAnsi(formatted);
expect(converted).toBe(expected1);
expect(formatted).toMatch(`${aOpenForeground2 + aOpenBackground2}-`);
expect(formatted).toMatch(`${bOpenForeground2 + bOpenBackground2}+`);
expect(formatted).not.toMatch(chalkInstance.bgYellow(' ')); // noColor
expect(formatted).toMatch(chalkInstance.bgYellow(' '));
});
test('level 3', () => {
const chalkInstance = new chalk.Instance({level: 3});
const formatted = formatLines(chalkInstance);
const converted = convertAnsi(formatted);
expect(converted).toBe(expected1);
expect(formatted).toMatch(`${aOpenForeground3 + aOpenBackground3}-`);
expect(formatted).toMatch(`${bOpenForeground3 + bOpenBackground3}+`);
expect(formatted).not.toMatch(chalkInstance.bgYellow(' ')); // noColor
expect(formatted).toMatch(chalkInstance.bgYellow(' '));
});
});
describe('matcher error', () => {
describe('toMatchInlineSnapshot', () => {
const received = {
id: 'abcdef',
text: 'Throw matcher error',
type: 'ADD_ITEM',
};
test('Expected properties must be an object (non-null) without snapshot', () => {
const context = {
isNot: false,
promise: '',
} as Context;
const properties = false;
expect(() => {
// @ts-expect-error: Testing runtime error
toMatchInlineSnapshot.call(context, received, properties);
}).toThrowErrorMatchingSnapshot();
});
test('Expected properties must be an object (null) with snapshot', () => {
const context = {
isNot: false,
promise: '',
} as Context;
const properties = null;
const snapshot = '';
expect(() => {
// @ts-expect-error: Testing runtime error
toMatchInlineSnapshot.call(context, received, properties, snapshot);
}).toThrowErrorMatchingSnapshot();
});
test('Expected properties must be an object (array) with snapshot', () => {
const context = {
isNot: false,
promise: '',
} as Context;
const properties: Array<unknown> = [];
const snapshot = '';
expect(() => {
toMatchInlineSnapshot.call(context, received, properties, snapshot);
}).toThrowErrorMatchingSnapshot();
});
test('Inline snapshot must be a string', () => {
const context = {
isNot: false,
promise: 'resolves',
} as Context;
const properties = {};
const snapshot = Symbol('is not a string');
expect(() => {
// @ts-expect-error: Testing runtime error
toMatchInlineSnapshot.call(context, received, properties, snapshot);
}).toThrowErrorMatchingSnapshot();
});
test('Snapshot matchers cannot be used with not', () => {
const context = {
isNot: true,
promise: '',
} as Context;
const received = -13;
const snapshot = '13';
expect(() => {
toMatchInlineSnapshot.call(context, received, snapshot);
}).toThrowErrorMatchingSnapshot();
});
});
describe('toMatchSnapshot', () => {
const received = {
id: 'abcdef',
text: 'Throw matcher error',
type: 'ADD_ITEM',
};
test('Expected properties must be an object (non-null)', () => {
const context = {
isNot: false,
promise: '',
} as Context;
const properties = () => {};
expect(() => {
toMatchSnapshot.call(context, received, properties);
}).toThrowErrorMatchingSnapshot();
});
test('Expected properties must be an object (null) with hint', () => {
const context = {
isNot: false,
promise: '',
} as Context;
const properties = null;
const hint = 'reminder';
expect(() => {
// @ts-expect-error: Testing runtime error
toMatchSnapshot.call(context, received, properties, hint);
}).toThrowErrorMatchingSnapshot();
});
test('Expected properties must be an object (null) without hint', () => {
const context = {
isNot: false,
promise: '',
} as Context;
const properties = null;
expect(() => {
// @ts-expect-error: Testing runtime error
toMatchSnapshot.call(context, received, properties);
}).toThrowErrorMatchingSnapshot();
});
test('Expected properties must be an object (array)', () => {
const context = {
isNot: false,
promise: '',
} as Context;
const properties: Array<unknown> = [];
expect(() => {
toMatchSnapshot.call(context, received, properties);
}).toThrowErrorMatchingSnapshot();
});
describe('received value must be an object', () => {
const context = {
currentTestName: '',
isNot: false,
promise: '',
snapshotState: {},
} as Context;
const properties = {};
test('(non-null)', () => {
expect(() => {
toMatchSnapshot.call(context, 'string', properties);
}).toThrowErrorMatchingSnapshot();
});
test('(null)', () => {
expect(() => {
toMatchSnapshot.call(context, null, properties);
}).toThrowErrorMatchingSnapshot();
});
});
// Future test: Snapshot hint must be a string
test('Snapshot state must be initialized', () => {
const context = {
isNot: false,
promise: 'resolves',
} as Context;
const hint = 'initialize me';
expect(() => {
toMatchSnapshot.call(context, received, hint);
}).toThrowErrorMatchingSnapshot();
});
});
describe('toThrowErrorMatchingInlineSnapshot', () => {
test('Inline snapshot must be a string', () => {
const context = {
isNot: false,
promise: '',
} as Context;
const received = () => {
throw new Error('Not found');
};
const snapshot = 404;
const fromPromise = false;
expect(() => {
toThrowErrorMatchingInlineSnapshot.call(
context,
received,
// @ts-expect-error: Testing runtime error
snapshot,
fromPromise,
);
}).toThrowErrorMatchingSnapshot();
});
test('Snapshot state must be initialized', () => {
const context = {
isNot: false,
promise: 'rejects',
} as Context;
const received = new Error('404');
const snapshot = '"Not found"';
const fromPromise = true;
expect(() => {
toThrowErrorMatchingInlineSnapshot.call(
context,
received,
snapshot,
fromPromise,
);
}).toThrowErrorMatchingSnapshot();
});
});
describe('toThrowErrorMatchingSnapshot', () => {
test('Received value must be a function', () => {
const context = {
isNot: false,
promise: '',
} as Context;
const received = 13;
const fromPromise = false;
expect(() => {
toThrowErrorMatchingSnapshot.call(
context,
received,
undefined,
fromPromise,
);
}).toThrowErrorMatchingSnapshot();
});
test('Snapshot matchers cannot be used with not', () => {
const context = {
isNot: true,
promise: '',
} as Context;
const received = new Error('received');
const hint = 'reminder';
const fromPromise = true;
expect(() => {
toThrowErrorMatchingSnapshot.call(context, received, hint, fromPromise);
}).toThrowErrorMatchingSnapshot();
});
// Future test: Snapshot hint must be a string
});
});
describe('other error', () => {
describe('toThrowErrorMatchingSnapshot', () => {
test('Received function did not throw', () => {
const context = {
isNot: false,
promise: '',
} as Context;
const received = () => {};
const fromPromise = false;
expect(() => {
toThrowErrorMatchingSnapshot.call(
context,
received,
undefined,
fromPromise,
);
}).toThrowErrorMatchingSnapshot();
});
});
});
describe('pass false', () => {
describe('toMatchInlineSnapshot', () => {
describe('with properties', () => {
const id = 'abcdef';
const properties = {id};
const type = 'ADD_ITEM';
describe('equals false', () => {
const context = {
currentTestName: 'with properties',
equals: () => false,
isNot: false,
promise: '',
snapshotState: {
fail: (fullTestName: string) => `${fullTestName} 1`,
},
utils: {
iterableEquality: () => {},
subsetEquality: () => {},
},
} as unknown as Context;
const received = {
id: 'abcdefg',
text: 'Increase code coverage',
type,
};
test('with snapshot', () => {
const snapshot = '';
const {message, pass} = toMatchInlineSnapshot.call(
context,
received,
properties,
snapshot,
) as SyncExpectationResult;
expect(pass).toBe(false);
expect(message()).toMatchSnapshot();
});
test('without snapshot', () => {
const {message, pass} = toMatchInlineSnapshot.call(
context,
received,
properties,
) as SyncExpectationResult;
expect(pass).toBe(false);
expect(message()).toMatchSnapshot();
});
});
test('equals true', () => {
const context = {
currentTestName: 'with properties',
equals: () => true,
isNot: false,
promise: '',
snapshotState: {
expand: false,
match({inlineSnapshot, received}) {
return {
actual: format(received),
count: 1,
expected: inlineSnapshot,
pass: false,
};
},
} as SnapshotState,
utils: {
iterableEquality: () => {},
subsetEquality: () => {},
},
} as unknown as Context;
const received = {
id,
text: 'received',
type,
};
const snapshot = format({
id,
text: 'inline snapshot',
type,
});
const {message, pass} = toMatchInlineSnapshot.call(
context,
received,
properties,
snapshot,
) as SyncExpectationResult;
expect(pass).toBe(false);
expect(message()).toMatchSnapshot();
});
});
});
describe('toMatchSnapshot', () => {
test('New snapshot was not written (multi line)', () => {
const context = {
currentTestName: 'New snapshot was not written',
isNot: false,
promise: '',
snapshotState: {
match({received}) {
return {
actual: format(received),
count: 1,
expected: undefined,
pass: false,
};
},
},
} as Context;
const received = 'To write or not to write,\nthat is the question.';
const hint = '(CI)';
const {message, pass} = toMatchSnapshot.call(
context,
received,
hint,
) as SyncExpectationResult;
expect(pass).toBe(false);
expect(message()).toMatchSnapshot();
});
test('New snapshot was not written (single line)', () => {
const context = {
currentTestName: 'New snapshot was not written',
isNot: false,
promise: '',
snapshotState: {
match({received}) {
return {
actual: format(received),
count: 2,
expected: undefined,
pass: false,
};
},
},
} as Context;
const received = 'Write me if you can!';
const hint = '(CI)';
const {message, pass} = toMatchSnapshot.call(
context,
received,
hint,
) as SyncExpectationResult;
expect(pass).toBe(false);
expect(message()).toMatchSnapshot();
});
describe('with properties', () => {
const id = 'abcdef';
const properties = {id};
const type = 'ADD_ITEM';
describe('equals false', () => {
const context = {
currentTestName: 'with properties',
equals: () => false,
isNot: false,
promise: '',
snapshotState: {
fail: (fullTestName: string) => `${fullTestName} 1`,
},
utils: {
iterableEquality: () => {},
subsetEquality: () => {},
},
} as unknown as Context;
test('isLineDiffable false', () => {
const {message, pass} = toMatchSnapshot.call(
context,
new RangeError('Invalid array length'),
{name: 'Error'},
) as SyncExpectationResult;
expect(pass).toBe(false);
expect(message()).toMatchSnapshot();
});
test('isLineDiffable true', () => {
const received = {
id: 'abcdefg',
text: 'Increase code coverage',
type,
};
const {message, pass} = toMatchSnapshot.call(
context,
received,
properties,
) as SyncExpectationResult;
expect(pass).toBe(false);
expect(message()).toMatchSnapshot();
});
});
test('equals true', () => {
const context = {
currentTestName: 'with properties',
equals: () => true,
isNot: false,
promise: '',
snapshotState: {
expand: false,
match({received}) {
return {
actual: format(received),
count: 1,
expected: format({
id,
text: 'snapshot',
type,
}),
pass: false,
};
},
} as SnapshotState,
utils: {
iterableEquality: () => {},
subsetEquality: () => {},
},
} as unknown as Context;
const received = {
id,
text: 'received',
type,
};
const hint = 'change text value';
const {message, pass} = toMatchSnapshot.call(
context,
received,
properties,
hint,
) as SyncExpectationResult;
expect(pass).toBe(false);
expect(message()).toMatchSnapshot();
});
});
});
describe('toThrowErrorMatchingInlineSnapshot', () => {
test('with snapshot', () => {
const context = {
currentTestName: 'with snapshot',
isNot: false,
promise: '',
snapshotState: {
expand: false,
match({inlineSnapshot, received}) {
return {
actual: format(received),
count: 1,
expected: inlineSnapshot,
pass: false,
};
},
},
} as Context;
const received = new Error('received');
const snapshot = '"inline snapshot"';
const fromPromise = true;
const {message, pass} = toThrowErrorMatchingInlineSnapshot.call(
context,
received,
snapshot,
fromPromise,
) as SyncExpectationResult;
expect(pass).toBe(false);
expect(message()).toMatchSnapshot();
});
});
});
describe('pass true', () => {
describe('toMatchSnapshot', () => {
test('without properties', () => {
const context = {
isNot: false,
promise: '',
snapshotState: {
match() {
return {
expected: '',
pass: true,
};
},
},
} as unknown as Context;
const received = 7;
const {pass} = toMatchSnapshot.call(
context,
received,
) as SyncExpectationResult;
expect(pass).toBe(true);
});
});
});
describe('printPropertiesAndReceived', () => {
test('omit missing properties', () => {
const received = {
b: {},
branchMap: {},
f: {},
fnMap: {},
// hash is missing
path: '…',
s: {},
statementMap: {},
};
const properties = {
hash: expect.any(String),
path: expect.any(String),
};
expect(
printPropertiesAndReceived(properties, received, false),
).toMatchSnapshot();
});
test('only highlight non passing properties', () => {
const received = {
a: 1,
b: 'some string',
c: 'another string',
};
const properties = {
a: expect.any(Number),
b: expect.any(Number),
};
expect(
printPropertiesAndReceived(properties, received, false),
).toMatchSnapshot();
});
});
describe('printSnapshotAndReceived', () => {
// Simulate default serialization.
const testWithStringify = (
expected: unknown,
received: unknown,
expand: boolean,
): string =>
printSnapshotAndReceived(
serialize(expected),
serialize(received),
received,
expand,
);
// Simulate custom raw string serialization.
const testWithoutStringify = (
expected: string,
received: string,
expand: boolean,
): string => printSnapshotAndReceived(expected, received, received, expand);
describe('backtick', () => {
test('single line expected and received', () => {
const expected = 'var foo = `backtick`;';
const received = 'var foo = tag`backtick`;';
expect(testWithStringify(expected, received, false)).toMatchSnapshot();
});
});
describe('empty string', () => {
test('expected and received single line', () => {
const expected = '';
const received = 'single line string';
expect(testWithStringify(expected, received, false)).toMatchSnapshot();
});
test('received and expected multi line', () => {
const expected = 'multi\nline\nstring';
const received = '';
expect(testWithStringify(expected, received, false)).toMatchSnapshot();
});
});
describe('escape', () => {
test('double quote marks in string', () => {
const expected = 'What does "oobleck" mean?';
const received = 'What does "ewbleck" mean?';
expect(testWithStringify(expected, received, false)).toMatchSnapshot();
});
test('backslash in multi line string', () => {
const expected = 'Forward / slash and back \\ slash';
const received = 'Forward / slash\nBack \\ slash';
expect(testWithStringify(expected, received, false)).toMatchSnapshot();
});
test('backslash in single line string', () => {
const expected = 'forward / slash and back \\ slash';
const received = 'Forward / slash and back \\ slash';
expect(testWithStringify(expected, received, false)).toMatchSnapshot();
});
test('regexp', () => {
const expected = /\\(")/g;
const received = /\\(")/;
expect(testWithStringify(expected, received, false)).toMatchSnapshot();
});
});
describe('expand', () => {
// prettier/pull/5272
const expected = [
'type TypeName<T> =',
'T extends string ? "string" :',
'T extends number ? "number" :',
'T extends boolean ? "boolean" :',
'T extends undefined ? "undefined" :',
'T extends Function ? "function" :',
'"object";',
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~',
'type TypeName<T> = T extends string',
'? "string"',
': T extends number',
'? "number"',
': T extends boolean',
'? "boolean"',
': T extends undefined',
'? "undefined"',
': T extends Function ? "function" : "object";',
'',
].join('\n');
const received = [
'type TypeName<T> =',
'T extends string ? "string" :',
'T extends number ? "number" :',
'T extends boolean ? "boolean" :',
'T extends undefined ? "undefined" :',
'T extends Function ? "function" :',
'"object";',
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~',
'type TypeName<T> = T extends string',
'? "string"',
': T extends number',
'? "number"',
': T extends boolean',
'? "boolean"',
': T extends undefined',
'? "undefined"',
': T extends Function',
'? "function"',
': "object";',
'',
].join('\n');
test('false', () => {
expect(testWithStringify(expected, received, false)).toMatchSnapshot();
});
test('true', () => {
expect(testWithStringify(expected, received, true)).toMatchSnapshot();
});
});
test('fallback to line diff', () => {
const expected = [
'[...a, ...b,];',
'[...a, ...b];',
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~',
'[...a, ...b];',
'[...a, ...b];',
'',
].join('\n');
const received = [
'====================================options=====================================',
'parsers: ["flow", "typescript"]',
'printWidth: 80',
' | printWidth',
'=====================================input======================================',
'[...a, ...b,];',
'[...a, ...b];',
'',
'=====================================output=====================================',
'[...a, ...b];',
'[...a, ...b];',
'',
'================================================================================',
].join('\n');
expect(testWithStringify(expected, received, false)).toMatchSnapshot();
});
describe('has no common after clean up chaff', () => {
test('array', () => {
const expected = ['delete', 'two'];
const received = ['insert', '2'];
expect(testWithStringify(expected, received, false)).toMatchSnapshot();
});
test('string single line', () => {
const expected = 'delete';
const received = 'insert';
expect(testWithStringify(expected, received, false)).toMatchSnapshot();
});