karma-jasmine

What is karma-jasmine?

The karma-jasmine npm package is a plugin for the Karma test runner that allows you to run and write tests using the Jasmine framework. Jasmine is a behavior-driven development framework for testing JavaScript code. Karma serves as a test environment that can run tests in multiple real browsers, which is useful for integration and unit testing.

What are karma-jasmine's main functionalities?

Testing Framework Integration

Integrates Jasmine with Karma to run tests written in Jasmine style within a browser environment.

module.exports = function(config) {
  config.set({
    frameworks: ['jasmine'],
    files: [
      'src/**/*.js',
      'test/**/*.spec.js'
    ],
    browsers: ['Chrome'],
    singleRun: true
  });
};

Describe and It Blocks

Allows writing test suites and specifications using Jasmine's global functions 'describe' and 'it'.

describe('A suite', function() {
  it('contains a spec with an expectation', function() {
    expect(true).toBe(true);
  });
});

Matchers

Provides a rich set of matchers (assertions) that can be used to test expected outcomes.

describe('Matchers', function() {
  it('allows for using Jasmine matchers', function() {
    expect(1 + 2).toEqual(3);
    expect(true).toBe(true);
    expect([1, 2, 3]).toContain(2);
  });
});

Spies

Supports Jasmine spies to track calls to functions and their arguments.

describe('A spy', function() {
  var foo, bar = null;

  beforeEach(function() {
    foo = {
      setBar: function(value) {
        bar = value;
      }
    };

    spyOn(foo, 'setBar');

    foo.setBar(123);
    foo.setBar(456, 'another param');
  });

  it('tracks that the spy was called', function() {
    expect(foo.setBar).toHaveBeenCalled();
  });
});

Asynchronous Support

Handles asynchronous operations in tests with Jasmine's done function.

describe('Async code', function() {
  var value;
  beforeEach(function(done) {
    setTimeout(function() {
      value = 0;
      done();
    }, 1);
  });

  it('should support async execution of test preparation and expectations', function(done) {
    value++;
    expect(value).toBeGreaterThan(0);
    done();
  });
});

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jest

Jest is a delightful JavaScript Testing Framework with a focus on simplicity. It works out of the box for any React project and is often favored for its snapshot testing feature. Jest provides its own assertion library and test runner, and it can be used as an alternative to the Karma-Jasmine setup.

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tape

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README

The README file is missing