Unit testing using jasmine in Javascript
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The document explains the importance of unit testing in JavaScript using the Jasmine framework, highlighting its ability to improve code quality and detect bugs early. It details Jasmine's setup, syntax for creating test suites and cases, and the use of matchers along with setup and teardown methods. The document also includes examples of how to create and run unit tests effectively.
Unit testing using jasmine in Javascript
- 1. UNIT TESTING USING JASMINE JAVASCRIPT
- 2. IMPORTANCE OF UNIT TEST Makes the process Agile Improves the Quality of Code Finds application issues/bugs early Detect Changes that may break the design contract in refactoring Provide debugging process Provides documentation Reduces cost
- 3. AVAILABLE UNIT TEST FRAMEWORKS Find more unit test frameworks - https://en.wikipedia.org/wiki/List_of_unit_testing_frameworks#JavaScript
- 4. WHY JASMINE FRAMEWORK Behaviour driven development framework, also supports TDD Used for synchronous and asynchronous javascript code Does not rely on DOM or any browser Has built in assertion library and command line utility to run the tests Has simple syntax
- 5. HELLO WORLD EXAMPLE Javascript function – - return ‘Hello World’ String Unit test case for Javascript function – - Calls actual function and matches the output with expected output
- 6. INSTALL JASMINE FRAMEWORK Download latest version of Jasmine framework – click here Extract all the files Open ‘SpecRunner.html’ file
- 7. JASMINE FILE STRUCTURE Boot Js – this file "boots" Jasmine, performing all of the necessary initialization before executing the loaded environment and all of a project's specs. Spec folder - Contains the Javascript tesintg files unit test files Src folder - Contains the Javascript source files Jasmine-html.js – Javascript library which has pure js functions to capture the running statistics of suits / specs Jasmine.js – Jasmine’s core engine which responsible to manage test life cycle SpecRunner.html– Test case runner HTML file
- 8. CREATE TEST AND TEST SUITE describe(string suiteName) - Declare test suites using this function Group of all respective it() /test cases it (string testName) – Declare test case Write multiple it() calls in a single describe() function The string you passed to the describe() as the first parameter will be concatenated with the string passed to the it(), to describe the complete name of the spec. Syntax : describe(‘Suite Name – Scenario name’, function() { it(‘test case 1 name’, function() { ... }; it(‘test case 2 name’, function() { ... }; })
- 9. MATCHERS • Any matcher can evaluate to a negative assertion by chaining the call to expect with a not before calling the matcher • Each matcher implements a boolean comparison between the actual value and the expected value. • It is responsible for reporting to Jasmine if the expectation is true or false. Jasmine will then pass or fail the spec.
- 10. LIST OF MATCHERS
- 11. SETUP AND TEARDOWN METHODS beforeEach() and afterEach() – runs before and after for every suite beforeAll() and afterAll() – runs before and after all the suites before All afterAll beforeEach Test afterEach Test Suits
- 12. TEARDOWN METHODS EXAMPLE beforeEach and afterEach Example beforeAll and afterAll Example
- 13. EXAMPLE - MATH.JS • Create new file in SRC Folder • Set file name as ‘Math.js’ • Create these functions for addition, subtraction • Make an entry in specRunner.html file
- 14. EXAMPLE - MATH-SPEC.JS • Create new file in ‘spec’ Folder • Set file name as ‘Math-spec.js’ • Make an entry in SpecRunner.html file
- 15. JASMINE SPEC-RUNNER DASHBOARD • Open SpecRunner.html file in any browser • Calculator is the name of the ‘Test suite’ • Name start with ‘should’ are the spec /scenario description
- 16. FAILING SPEC The fail () function causes a spec to fail. It can take a failure message or an Error object as a parameter.
- 18. THANK YOU