forked from jestjs/jest
/
index.ts
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/
index.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 chalk from 'chalk';
import jestDiff, {DiffOptions} from 'jest-diff';
import getType from 'jest-get-type';
import prettyFormat from 'pretty-format';
const {
AsymmetricMatcher,
DOMCollection,
DOMElement,
Immutable,
ReactElement,
ReactTestComponent,
} = prettyFormat.plugins;
const PLUGINS = [
ReactTestComponent,
ReactElement,
DOMElement,
DOMCollection,
Immutable,
AsymmetricMatcher,
];
export type MatcherHintOptions = {
comment?: string;
isDirectExpectCall?: boolean;
isNot?: boolean;
promise?: string;
secondArgument?: string;
};
export {DiffOptions};
export const EXPECTED_COLOR = chalk.green;
export const RECEIVED_COLOR = chalk.red;
export const INVERTED_COLOR = chalk.inverse;
export const BOLD_WEIGHT = chalk.bold;
const DIM_COLOR = chalk.dim;
const NUMBERS = [
'zero',
'one',
'two',
'three',
'four',
'five',
'six',
'seven',
'eight',
'nine',
'ten',
'eleven',
'twelve',
'thirteen',
];
export const SUGGEST_TO_EQUAL = chalk.dim(
'Note that you are testing for equality with the stricter `toBe` matcher using `Object.is`. For deep equality only, use `toEqual` instead.',
);
export const SUGGEST_TO_CONTAIN_EQUAL = chalk.dim(
'Looks like you wanted to test for object/array equality with the stricter `toContain` matcher. You probably need to use `toContainEqual` instead.',
);
export const stringify = (object: unknown, maxDepth: number = 10): string => {
const MAX_LENGTH = 10000;
let result;
try {
result = prettyFormat(object, {
maxDepth,
min: true,
plugins: PLUGINS,
});
} catch (e) {
result = prettyFormat(object, {
callToJSON: false,
maxDepth,
min: true,
plugins: PLUGINS,
});
}
return result.length >= MAX_LENGTH && maxDepth > 1
? stringify(object, Math.floor(maxDepth / 2))
: result;
};
export const highlightTrailingWhitespace = (text: string): string =>
text.replace(/\s+$/gm, chalk.inverse('$&'));
export const printReceived = (object: unknown) =>
RECEIVED_COLOR(highlightTrailingWhitespace(stringify(object)));
export const printExpected = (value: unknown) =>
EXPECTED_COLOR(highlightTrailingWhitespace(stringify(value)));
export const printWithType = (
name: string, // 'Expected' or 'Received'
value: unknown,
print: (value: unknown) => string, // printExpected or printReceived
) => {
const type = getType(value);
const hasType =
type !== 'null' && type !== 'undefined'
? `${name} has type: ${type}\n`
: '';
const hasValue = `${name} has value: ${print(value)}`;
return hasType + hasValue;
};
export const ensureNoExpected = (
expected: unknown,
matcherName: string,
options?: MatcherHintOptions,
) => {
if (typeof expected !== 'undefined') {
// Prepend maybe not only for backward compatibility.
const matcherString = (options ? '' : '[.not]') + matcherName;
throw new Error(
matcherErrorMessage(
matcherHint(matcherString, undefined, '', options),
// Because expected is omitted in hint above,
// expected is black instead of green in message below.
'this matcher must not have an expected argument',
printWithType('Expected', expected, printExpected),
),
);
}
};
export const ensureActualIsNumber = (
actual: unknown,
matcherName: string,
options?: MatcherHintOptions,
) => {
if (typeof actual !== 'number') {
// Prepend maybe not only for backward compatibility.
const matcherString = (options ? '' : '[.not]') + matcherName;
throw new Error(
matcherErrorMessage(
matcherHint(matcherString, undefined, undefined, options),
`${RECEIVED_COLOR('received')} value must be a number`,
printWithType('Received', actual, printReceived),
),
);
}
};
export const ensureExpectedIsNumber = (
expected: unknown,
matcherName: string,
options?: MatcherHintOptions,
) => {
if (typeof expected !== 'number') {
// Prepend maybe not only for backward compatibility.
const matcherString = (options ? '' : '[.not]') + matcherName;
throw new Error(
matcherErrorMessage(
matcherHint(matcherString, undefined, undefined, options),
`${EXPECTED_COLOR('expected')} value must be a number`,
printWithType('Expected', expected, printExpected),
),
);
}
};
export const ensureNumbers = (
actual: unknown,
expected: unknown,
matcherName: string,
options?: MatcherHintOptions,
) => {
ensureActualIsNumber(actual, matcherName, options);
ensureExpectedIsNumber(expected, matcherName, options);
};
export const ensureExpectedIsNonNegativeInteger = (
expected: unknown,
matcherName: string,
options?: MatcherHintOptions,
) => {
if (
typeof expected !== 'number' ||
!Number.isSafeInteger(expected) ||
expected < 0
) {
// Prepend maybe not only for backward compatibility.
const matcherString = (options ? '' : '[.not]') + matcherName;
throw new Error(
matcherErrorMessage(
matcherHint(matcherString, undefined, undefined, options),
`${EXPECTED_COLOR('expected')} value must be a non-negative integer`,
printWithType('Expected', expected, printExpected),
),
);
}
};
// Sometimes, e.g. when comparing two numbers, the output from jest-diff
// does not contain more information than the `Expected:` / `Received:` already gives.
// In those cases, we do not print a diff to make the output shorter and not redundant.
const shouldPrintDiff = (actual: unknown, expected: unknown) => {
if (typeof actual === 'number' && typeof expected === 'number') {
return false;
}
if (typeof actual === 'boolean' && typeof expected === 'boolean') {
return false;
}
return true;
};
export const diff: typeof jestDiff = (a, b, options) =>
shouldPrintDiff(a, b) ? jestDiff(a, b, options) : null;
export const pluralize = (word: string, count: number) =>
(NUMBERS[count] || count) + ' ' + word + (count === 1 ? '' : 's');
// To display lines of labeled values as two columns with monospace alignment:
// given the strings which will describe the values,
// return function which given each string, returns the label:
// string, colon, space, and enough padding spaces to align the value.
type PrintLabel = (string: string) => string;
export const getLabelPrinter = (...strings: Array<string>): PrintLabel => {
const maxLength = strings.reduce(
(max, string) => (string.length > max ? string.length : max),
0,
);
return string => `${string}: ${' '.repeat(maxLength - string.length)}`;
};
export const matcherErrorMessage = (
hint: string, // assertion returned from call to matcherHint
generic: string, // condition which correct value must fulfill
specific: string, // incorrect value returned from call to printWithType
) => `${hint}\n\n${chalk.bold('Matcher error')}: ${generic}\n\n${specific}`;
// Display assertion for the report when a test fails.
// New format: rejects/resolves, not, and matcher name have black color
// Old format: matcher name has dim color
export const matcherHint = (
matcherName: string,
received: string = 'received',
expected: string = 'expected',
options: MatcherHintOptions = {},
) => {
const {
comment = '',
isDirectExpectCall = false, // seems redundant with received === ''
isNot = false,
promise = '',
secondArgument = '',
} = options;
let hint = '';
let dimString = 'expect'; // concatenate adjacent dim substrings
if (!isDirectExpectCall && received !== '') {
hint += DIM_COLOR(dimString + '(') + RECEIVED_COLOR(received);
dimString = ')';
}
if (promise !== '') {
hint += DIM_COLOR(dimString + '.') + promise;
dimString = '';
}
if (isNot) {
hint += DIM_COLOR(dimString + '.') + 'not';
dimString = '';
}
if (matcherName.includes('.')) {
// Old format: for backward compatibility,
// especially without promise or isNot options
dimString += matcherName;
} else {
// New format: omit period from matcherName arg
hint += DIM_COLOR(dimString + '.') + matcherName;
dimString = '';
}
if (expected === '') {
dimString += '()';
} else {
hint += DIM_COLOR(dimString + '(') + EXPECTED_COLOR(expected);
if (secondArgument) {
hint += DIM_COLOR(', ') + EXPECTED_COLOR(secondArgument);
}
dimString = ')';
}
if (comment !== '') {
dimString += ' // ' + comment;
}
if (dimString !== '') {
hint += DIM_COLOR(dimString);
}
return hint;
};