js-testcat

JavaScript Test Categories

Add test categories to mocha (BDD style) and jasmine tests.

Get started

Install the library

Install the library to your project (usually as a dev dependency).

npm install js-testcat --save-dev

Use the library

To use the library simply import or require it, then use cdescribe or cit instead of describe or it:

TypeScript sample

import { cdescribe, cit } from 'js-testcat';
 
// A regular mocha/jasmine test suite/spec
describe('Some Spec', () => {
    
    // A suite/spec with a single test category
    cdescribe('Spec with test category', 'MyCategory', () => {
        
        it('Test case', () => {
            // .. test code
        });
 
    });
 
    // A test case with multiple test categories.
    cit('Test case with test categories', ['SomeCategory', 'SomeOtherCategory'], () => {
 
    });
 
});

You can find more samples in the js-testcat-samples repo.

The cdescribe specs/suites and cit test cases are executed depending on the test categories you pass to the test run:

• Neither includes nor excludes
  Js-testcat will execute all test suites/specs and test cases as if you had used describe and it instead of cdescribe and cit.
• Includes only
  When you provide only test category includes to the test run, js-testcat only executes test cases and suites/specs that are associated with at least one of the included categories.
• Excludes only
  When passing only test category excludes to the test run, js-testcat executes all suites/specs and test cases that are not associated with any of the excluded categories.
• Includes and excludes
  If you pass both included and excluded test categories to the test run, js-testcat only executes test suites/specs and test cases that are associated with at least one of the included, but not associated with any of the excluded categories.

Note: Test category comparison is done case-sensitive!

APIs

Js-testcat uses the following APIs to let you define and configure test categories:

cdescribe(description, categories, callback)

Use the cdescribe function instead of mocha's or jasmine's describe function to create a test suite/spec that is associated with one or more test categories. In addition to the regular description and callback parameters, js-testcat adds the parameter categories that takes either a single category (string) or a list of categories (string[]) and associates the suite/spec with the given test categories.

cit(description, categories, callback)

Use the cit function instead of mocha's or jasmine's it function to create a test case that is associated with one or more test categories. In addition to the regular description and callback parameters, js-testcat adds the parameter categories that takes either a single category (string) or a list of categories (string[]) and associates the suite/spec with the given test categories.

addTestcatFile(file) / removeTestcatFile(file)

The addTestcatFile and removeTestcatFile functions provide a way of adding or removing test category includes and excludes from a js-testcat file (see below) directly in your test code. Both methods throw an error if the file does not exist.

addIncludes(includes) / removeIncludes(includes) / removeAllIncludes()

The addIncludes, removeIncludes, and removeAllIncludes functions provide a way of adding or removing test category includes directly in your test code. Similar to the categories parameter of the cdescribe and cit functions, you may either pass a single include (string) or a list of includes (string[]);

getIncludes() / getExcludes()

If you want to access the currently included or excluded test categories, you can use the getIncludes and getExcludes functions both of which return a string[].

addExcludes(excludes) / removeExcludes(excludes) / removeAllExcludes()

The addExcludes, removeExcludes, and removeAllExcludes functions provide a way of adding or removing test category excludes directly in your test code. Similar to the categories parameter of the cdescribe and cit functions, you may either pass a single exclude (string) or a list of excludes (string[]);

reset()

Resets js-testcat to its uninitialized state. This forces js-testcat to re-initialize test categories from environment variables.

Environment variables

Since neither mocha nor jasmine provide an easy way of passing arbitrary parameters to the test execution, js-testcat uses the following environment variables to configure included and excluded test categories.

JSTESTCAT_INCLUDE / JSTESTCAT_EXCLUDE

Set JSTESTCAT_INCLUDE to a comma-separated list of category names to include them in the test execution and set JSTESTCAT_EXCLUDE to a comma-separated list of category names to exclude them from the test execution.

JSTESTCAT_FILE

Set JSTESTCAT_FILE to the path to a js-testcat file that contains the test categories you want to include and exclude.

Js-testcat file format

The easiest way to quickly switch between different sets of test categories is to use js-testcat files. A js-testcat file is a simple JSON file containing included and excluded test categories. The below sample file configures js-testcat to run all unit and integration tests but not UI tests.

Js-testcat file sample

{
    "includes": [
        "Unit",
        "Integration"
    ],
    "excludes": [
        "UI"
    ]
}

Building and testing js-testcat

Make sure to have gulp (npm install -g gulp) and typescript (npm install -g typescript) globally installed, then clone the repo and run npm install.

Once all packages have been restored, run npm test to build and test js-testcat or simply run tsc to just transpile the code to JavaScript. With the included launch.json you can also easily debug the tests using Visual Studio Code.