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@serenity-js/assertions

3.0.0-rc.3
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  • License Apache-2.0

Screenplay-style assertion library

Package Exports

  • @serenity-js/assertions
  • @serenity-js/assertions/lib/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@serenity-js/assertions) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

Serenity/JS

Serenity/JS is a framework designed to make acceptance and regression testing of modern full-stack applications faster, more collaborative and easier to scale.

Visit serenity-js.org for the latest tutorials and API docs, and follow @SerenityJS and @JanMolak on Twitter for project updates.

Learning Serenity/JS

To learn more about Serenity/JS, check out the video below, read the tutorial, review the examples, and create your own test suite with Serenity/JS template projects.

If you have any questions, join us on Serenity/JS Community Chat.

Full-Stack Acceptance Testing with Serenity/JS and the Screenplay Pattern

Serenity/JS Assertions

@serenity-js/assertions is an assertions library implementing the Screenplay Pattern.

Installation

To install this module, run the following command in your computer terminal:

npm install --save-dev @serenity-js/{core,assertions}

Performing verifications using Ensure

import { actorCalled } from '@serenity-js/core';
import { Ensure, endsWith } from '@serenity-js/assertions';
import { Website } from '@serenity-js/protractor';

const actor = actorCalled('Erica');

actor.attemptsTo(
    Ensure.that(Website.title(), endsWith('Serenity/JS'))
);

Controlling execution flow using Check

import { actorCalled } from '@serenity-js/core';
import { Check } from '@serenity-js/assertions'; 
import { Click, isVisible } from '@serenity-js/protractor';

actorCalled('Erica').attemptsTo(
    Check.whether(NewsletterModal, isVisible())
        .andIfSo(Click.on(CloseModalButton)),
);

Synchronising the test with the System Under Test using Wait

import { actorCalled } from '@serenity-js/core';
import { Click, isVisible, Wait } from '@serenity-js/protractor';

actorCalled('Erica').attemptsTo(
    Wait.until(CloseModalButton, isVisible()),
    Click.on(CloseModalButton)
);

Defining custom expectations using Expectation.thatActualShould

import { actorCalled } from '@serenity-js/core';
import { Expectation, Ensure } from '@serenity-js/assertions';

function isDivisibleBy(expected: Answerable<number>): Expectation<number> {
    return Expectation.thatActualShould<number, number>('have value divisible by', expected)
        .soThat((actualValue, expectedValue) => actualValue % expectedValue === 0);
}

actorCalled('Erica').attemptsTo(
    Ensure.that(4, isDivisibleBy(2)),
);

Composing expectations using Expectation.to

import { actorCalled } from '@serenity-js/core';
import { Expectation, Ensure, and, or, isGreaterThan, isLessThan, equals  } from '@serenity-js/assertions';

function isWithin(lowerBound: number, upperBound: number) {
    return Expectation
        .to(`have value within ${ lowerBound } and ${ upperBound }`)
        .soThatActual(and(
           or(isGreaterThan(lowerBound), equals(lowerBound)),
           or(isLessThan(upperBound), equals(upperBound)),
        ));
}

actorCalled('Erica').attemptsTo(
    Ensure.that(5, isWithin(3, 6)),
);