How to use jest-matchers - 10 common examples
To help you get started, we’ve selected a few jest-matchers examples, based on popular ways it is used in public projects.
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function installJestExpect() {
const expect = require('jest-matchers');
global.expect = expect;
const jasmine = global.jasmine;
jasmine.anything = expect.anything;
jasmine.any = expect.any;
jasmine.objectContaining = expect.objectContaining;
jasmine.arrayContaining = expect.arrayContaining;
jasmine.stringMatching = expect.stringMatching;
jasmine.addMatchers = (jasmineMatchersObject) => {
const jestMatchersObject = Object.create(null);
Object.keys(jasmineMatchersObject).forEach(name => {
jestMatchersObject[name] = function() {
const result = jasmineMatchersObject[name](jasmine.matchersUtil, null);
// if there is no 'negativeCompare', both should be handled by `compare`
const negativeCompare = result.negativeCompare || result.compare;
return this.isNot
? negativeCompare.apply(null, arguments)
: result.compare.apply(null, arguments);
};
});function installJestExpect() {
const expect = require('jest-matchers');
global.expect = expect;
const jasmine = global.jasmine;
jasmine.anything = expect.anything;
jasmine.any = expect.any;
jasmine.objectContaining = expect.objectContaining;
jasmine.arrayContaining = expect.arrayContaining;
jasmine.stringMatching = expect.stringMatching;
jasmine.addMatchers = (jasmineMatchersObject) => {
const jestMatchersObject = Object.create(null);
Object.keys(jasmineMatchersObject).forEach(name => {
jestMatchersObject[name] = function() {
const result = jasmineMatchersObject[name](jasmine.matchersUtil, null);
// if there is no 'negativeCompare', both should be handled by `compare`
const negativeCompare = result.negativeCompare || result.compare;
return this.isNot
? negativeCompare.apply(null, arguments)
: result.compare.apply(null, arguments);
};function installJestExpect() {
const expect = require('jest-matchers');
global.expect = expect;
const jasmine = global.jasmine;
jasmine.anything = expect.anything;
jasmine.any = expect.any;
jasmine.objectContaining = expect.objectContaining;
jasmine.arrayContaining = expect.arrayContaining;
jasmine.stringMatching = expect.stringMatching;
jasmine.addMatchers = (jasmineMatchersObject) => {
const jestMatchersObject = Object.create(null);
Object.keys(jasmineMatchersObject).forEach(name => {
jestMatchersObject[name] = function() {
const result = jasmineMatchersObject[name](jasmine.matchersUtil, null);
// if there is no 'negativeCompare', both should be handled by `compare`
const negativeCompare = result.negativeCompare || result.compare;
return this.isNot
? negativeCompare.apply(null, arguments)
: result.compare.apply(null, arguments);
};
});
const expect = global.expect;function installJestExpect() {
const expect = require('jest-matchers');
global.expect = expect;
const jasmine = global.jasmine;
jasmine.anything = expect.anything;
jasmine.any = expect.any;
jasmine.objectContaining = expect.objectContaining;
jasmine.arrayContaining = expect.arrayContaining;
jasmine.stringMatching = expect.stringMatching;
jasmine.addMatchers = (jasmineMatchersObject) => {
const jestMatchersObject = Object.create(null);
Object.keys(jasmineMatchersObject).forEach(name => {
jestMatchersObject[name] = function() {
const result = jasmineMatchersObject[name](jasmine.matchersUtil, null);
// if there is no 'negativeCompare', both should be handled by `compare`
const negativeCompare = result.negativeCompare || result.compare;
return this.isNot
? negativeCompare.apply(null, arguments)
: result.compare.apply(null, arguments);
};
});function installJestExpect() {
const expect = require('jest-matchers');
global.expect = expect;
const jasmine = global.jasmine;
jasmine.anything = expect.anything;
jasmine.any = expect.any;
jasmine.objectContaining = expect.objectContaining;
jasmine.arrayContaining = expect.arrayContaining;
jasmine.stringMatching = expect.stringMatching;
jasmine.addMatchers = (jasmineMatchersObject) => {
const jestMatchersObject = Object.create(null);
Object.keys(jasmineMatchersObject).forEach(name => {
jestMatchersObject[name] = function() {
const result = jasmineMatchersObject[name](jasmine.matchersUtil, null);
// if there is no 'negativeCompare', both should be handled by `compare`
const negativeCompare = result.negativeCompare || result.compare;
return this.isNot
? negativeCompare.apply(null, arguments)
: result.compare.apply(null, arguments);
};
});
const expect = global.expect;
expect.extend(jestMatchersObject);function compareSnapshot(expect, flags, subjectAdapter, subjectRenderer, subjectOutput) {
const state = matchers.getState();
if (!state.unexpectedSnapshot) {
state.unexpectedSnapshot = new UnexpectedSnapshotState(state.snapshotState);
}
const snapshot = state.unexpectedSnapshot.getSnapshot(state.testPath, state.currentTestName, expect);
if (snapshot === null) {
// Write and save
state.unexpectedSnapshot.saveSnapshot(state.testPath, state.currentTestName, rawAdapter.serialize(subjectAdapter, subjectOutput), expect);
state.snapshotState.added++;
} else {
expect.withError(() => {
if (flags.satisfy) {
expect(subjectRenderer, 'to have rendered', rawAdapter.deserialize(snapshot));
} else {
expect(subjectRenderer, 'to have rendered with all children with all wrappers with all classes with all attributes', rawAdapter.deserialize(snapshot));function assertDeepEqual(actual, expected) {
const result = matchers.toEqual(actual, expected);
if (!result.pass) {
const diff = diffTestMessages(result.actual, result.expected);
throw diff + '\n' + result.message();
}
}snapshotState.removeUncheckedKeys = function () {
const state = matchers.getState();
let isDirty = false;
const snapshot = state.unexpectedSnapshot && state.unexpectedSnapshot._files[state.testPath];
if (snapshot && snapshot.uncheckedKeys.size) {
snapshot.uncheckedKeys.forEach(key => {
const testName = /(.*)\s[0-9]+$/.exec(key)[1];
if (!snapshot.failedTests.has(testName)) {
isDirty = true;
delete snapshot.allTests[key]
}
});
}
if (!snapshot || Object.keys(snapshot.allTests).length === 0) {
const snapshotPath = getSnapshotPath(state.testPath);
try {function injectStateHooks() {
const state = matchers.getState();
const snapshotState = state && state.snapshotState;
if (snapshotState) {
const originalRemoveUncheckedKeys = snapshotState.removeUncheckedKeys;
snapshotState.removeUncheckedKeys = function () {
const state = matchers.getState();
let isDirty = false;
const snapshot = state.unexpectedSnapshot && state.unexpectedSnapshot._files[state.testPath];
if (snapshot && snapshot.uncheckedKeys.size) {
snapshot.uncheckedKeys.forEach(key => {
const testName = /(.*)\s[0-9]+$/.exec(key)[1];
if (!snapshot.failedTests.has(testName)) {
isDirty = true;
delete snapshot.allTests[key]
}import { toEqual } from 'jest-matchers/build/matchers';
import { SubscriptionLog } from 'rxjs/internal/testing/SubscriptionLog';
import { TestMessage } from '../message/TestMessage';
import { constructObservableMarble } from './constructObservableMarble';
import { constructSubscriptionMarble } from './constructSubscriptionMarble';
const { matcherHint, printExpected, printReceived } = require('jest-matcher-utils'); //tslint:disable-line:no-require-imports no-var-requires
const toEqualAssert = toEqual.bind({ expand: false });
const subscriptionMarbleAssert = (source: Array) => (expected: Array) => {
const asserted = toEqualAssert(source, expected);
if (!asserted.pass) {
const length = source.length > expected.length ? source.length : expected.length;
let description = `
${matcherHint(' to equal ')}
`;
for (let idx = 0; idx < length; idx++) {
const sourceMarble = !!source[idx]
? constructSubscriptionMarble(source[idx])
: { marbleString: '', frameString: '' };
const expectedMarble = !!expected[idx]
? constructSubscriptionMarble(expected[idx])
