How to use the expect function from chai
Find comprehensive JavaScript chai.expect code examples handpicked from public code repositorys.
chai.expect is an assertion library that provides a way to write test cases by comparing the actual output with the expected output.
3 4 5 6 7 8 9 10 11 12var chai = require('chai'); var chaiAsPromised = require('chai-as-promised'); chai.use(chaiAsPromised); var expect = chai.expect; describe('admin - members', function() { before(async function(){ browser.get(browser.params.glob.host + 'project/project-0/admin/memberships');
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240 241 242 243 244 245 246 247 248 249When('I increment the variable by {int}', function (number) { this.incrementBy(number); }); Then('the variable should contain {int}', function (number) { expect(this.variable).to.eql(number); }); ``` ### Cypress
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How does chai.expect work?
chai.expect is a function provided by the Chai assertion library in JavaScript, which allows you to make assertions and test for specific behaviors in your code by creating a chain of expressions that evaluate the value of an object or expression. When you use chai.expect to create an assertion, you start by calling the function on the value you want to test, and then you chain together one or more methods that evaluate the value in some way, such as to.be.equal() to check if two values are equal. Finally, you end the chain with a method that throws an error if the assertion fails, such as to.throw() or to.not.throw().
GitHub: flowhub/the-graph
38 39 40 41 42 43 44 45 46 47}) return bluebird.resolve(null).then(() => { //console.log('running', [prog].concat(args).join(' ')); return execFile(prog, args) }).then((out) => { chai.expect(out.stdout).to.include('Written to'); chai.expect(out.stdout).to.include(options.output); return readFile(options.output) }).then((data) => { return data
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107 108 109 110 111 112 113 114 115 116```js const { expect } = require('chai') const allIntsArePositive = property(gen.int, num => { expect(num).to.be.at.least(0); }) const test = check(allIntsArePositive) console.log(test.shrunk.result)
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Ai Example
1 2 3 4 5 6 7 8 9 10 11 12const chai = require("chai"); const expect = chai.expect; describe("Array", function () { describe("#indexOf()", function () { it("should return -1 when the value is not present", function () { const arr = [1, 2, 3]; const val = 4; expect(arr.indexOf(val)).to.equal(-1); }); }); });
In this example, chai is required and expect is assigned to the expect function provided by chai. The test suite then describes an array and its indexOf() method. An expectation is set up that when the value 4 is searched for in the array, the result should be -1.
122 123 124 125 126 127 128 129 130 131Cucumber will automatically load RSpec's matchers and expectation methods to be available in your step definitions. For example: ```ruby Given /^a nice new bike$/ do expect(bike).to be_shiny end ``` If you want to configure RSpec, you'll need to also add the `rspec-core` gem
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14 15 16 17 18 19 20 21 22// the revert reason, otherwise it will be the type of exception (e.g. 'invalid opcode') const actualError = error.message.replace( /Returned error: VM Exception while processing transaction: (revert )?/, '', ); expect(actualError).to.equal(expectedError, 'Wrong kind of exception received'); } return; }
13339822GitHub: ssrwpo/ssr
19 20 21 22 23 24 25 26 27// Combine both jest and chai matchers on expect const originalExpect = global.expect; global.expect = (actual) => { const originalMatchers = originalExpect(actual); const chaiMatchers = chai.expect(actual); const combinedMatchers = Object.assign(chaiMatchers, originalMatchers); return combinedMatchers; };
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26 27 28 29 30 31 32 33 34 35/** * I'm called after any instance of S1T1A is created */ afterCreate(...args) { // I need to check `args` here // chai.expect(args)... } } InstanceGenerator.create(S1T1A, 3); // create 3 instances of S1T1A });
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34 35 36 37 38 39 40 41 42 43traceparent: '00-1111aaaa2222bbbb3333cccc4444dddd-5555eeee6666ffff-01', tracestate: TraceState.fromString('dd=s:-1;o:foo;t.dm:-4;t.usr.id:bar') } const spanContext = new SpanContext(props) expect(spanContext).to.deep.equal({ _traceId: '123', _spanId: '456', _parentId: '789', _name: 'test',
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62 63 64 65 66 67 68 69 70 71expect(config).to.have.property('debug', false) expect(config).to.have.property('protocolVersion', '0.4') expect(config).to.have.nested.property('dogstatsd.hostname', '127.0.0.1') expect(config).to.have.nested.property('dogstatsd.port', '8125') expect(config).to.have.property('flushInterval', 2000) expect(config).to.have.property('flushMinSpans', 1000) expect(config).to.have.property('queryStringObfuscation').with.length(626) expect(config).to.have.property('clientIpEnabled', false) expect(config).to.have.property('clientIpHeader', null) expect(config).to.have.property('sampleRate', 1)
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562 563 564 565 566 567 568 569 570 571const { title, sql } = sqlInfo it(`should support ${title}`, () => { expect(getParsedSql(sql[0])).to.equal(sql[1]) }) it(`should support ${title} in mariadb`, () => { expect(getParsedSql(sql[0], mariadb)).to.equal(sql[1]) }) }) it('should have spaces between keywords', () => {
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9 10 11 12 13 14 15 16 17 18 19const markerPath = path.join(__dirname, 'marker.png'); describe('StaticMap', () => { describe('Initializing ...', () => { it('without any arguments', () => { expect(() => { const options = { width: 600, height: 200, };
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45 46 47 48 49 50 51 52 53 54const authKey = 'authKey'; await firebaseService.connect(options, authKey); expect(firebase.initializeApp).to.have.been.calledWith(options); expect(firebase.signInWithCustomToken).to.have.been.calledWith(authKey); }); it('should not re-initialize firebase if firebase app was already initialized', async () => { firebaseService = new FirebaseService('firebase-service-uut');
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65 66 67 68 69 70 71 72 73 74await page.goto(host); await page.waitForSelector('#btnLoadPosts'); await page.click('text=Load Posts'); await page.waitForSelector('#posts'); expect(isCalled()).to.be.true; }); it('Load Posts', async () => { const data = mockData.blog;
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GitHub: maximkraychev/SoftUni
55 56 57 58 59 60 61 62 63 64await page.click('[type="submit"]'); await page.waitForTimeout(interval); expect(isCalled()).to.be.false; }); it('Register makes correct API call [ 5 Points ]', async () => { const data = mockData.users[0];
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9 10 11 12 13 14 15 16 17 18 19 20 21describe("buildList", () => { const defaultTokenList = buildList(); it("validates", () => { expect(validator(defaultTokenList)).to.equal(true); }); it("contains no duplicate addresses", () => { const map = {};
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7 8 9 10 11 12 13 14 15 16url: 'http://localhost:7865', method: 'GET', }; request(options, function (error, response, body) { expect(response.statusCode).to.equal(200); expect(body).to.equal('Welcome to the payment system'); done(); }); });
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158 159 160 161 162 163 164 165 166onRequest(), page.click("nav >> text=Logout"), ]); const token = request.headers()["x-authorization"]; expect(request.method()).to.equal("GET"); expect(token).to.equal(data.accessToken); }); });
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chai.expect is the most popular function in chai (8749 examples)