jslib-plugin-unit-jest
unit-jest plugin for create-jslib
Injected Commands
-
jslib-service test:unit
Run unit tests with Jest. Default
testMatch
is<rootDir>/(tests/unit/**/*.spec.(js|jsx|ts|tsx)|**/__tests__/*.(js|jsx|ts|tsx))
which matches:- Any files in
tests/unit
that end in.spec.(js|jsx|ts|tsx)
; - Any js(x)/ts(x) files inside
__tests__
directories.
Usage:
jslib-service test:unit [options] <regexForTestFiles>
All Jest command line options are also supported.
- Any files in
Debugging Tests
Note that directly running jest
will fail because the Babel preset requires hints to make your code work in Node.js, so you must run your tests with jslib-service test:unit
.
If you want to debug your tests via the Node inspector, you can run the following:
# macOS or linux
node --inspect-brk ./node_modules/.bin/jslib-service test:unit
# Windows
node --inspect-brk ./node_modules/jslib-service/bin/jslib-service.js test:unit
Configuration
Jest can be configured via jest.config.js
in your project root, or the jest
field in package.json
.
/node_modules
Transform dependencies from By default, jest doesn't transform anything from /node_modules
.
Since jest runs in node, we also don't have to transpile anything that uses modern ECMAScript features as Node >=8 already supports these features, so it's a sensible default. jslib-plugin-jest also doesn't respect the transpileDependencies
option in jslib.config.js
for the same reason.
However, we have (at least) three cases where we do need to transpile code from /node_modules
in jest:
- Usage of ES6
import
/export
statements, which have to be compiled to commonjsmodule.exports
- Typescript code
To do this, we need to add an exception to the tranformIgnorePatterns
option of jest. This is its default value:
transformIgnorePatterns: ['/node_modules/']
We have to add exceptions to this pattern with a RegExp negative lookahead:
transformIgnorePatterns: ['/node_modules/(?!name-of-lib-o-transform)']
To exclude multiple libraries:
transformIgnorePatterns: ['/node_modules/(?!lib-to-transform|other-lib)']