Commit 6b1e4ad5 authored by Mike Greiling's avatar Mike Greiling Committed by Clement Ho

Fix memory and performance issues in Karma test suite

parent 71d53ebc
var path = require('path'); const path = require('path');
var webpack = require('webpack'); const glob = require('glob');
var argumentsParser = require('commander'); const chalk = require('chalk');
var webpackConfig = require('./webpack.config.js'); const webpack = require('webpack');
var ROOT_PATH = path.resolve(__dirname, '..'); const argumentsParser = require('commander');
const webpackConfig = require('./webpack.config.js');
const ROOT_PATH = path.resolve(__dirname, '..');
function fatalError(message) {
console.error(chalk.red(`\nError: ${message}\n`));
process.exit(1);
}
// remove problematic plugins // remove problematic plugins
if (webpackConfig.plugins) { if (webpackConfig.plugins) {
...@@ -15,33 +23,70 @@ if (webpackConfig.plugins) { ...@@ -15,33 +23,70 @@ if (webpackConfig.plugins) {
}); });
} }
var testFiles = argumentsParser const specFilters = argumentsParser
.option( .option(
'-f, --filter-spec [filter]', '-f, --filter-spec [filter]',
'Filter run spec files by path. Multiple filters are like a logical OR.', 'Filter run spec files by path. Multiple filters are like a logical OR.',
(val, memo) => { (filter, memo) => {
memo.push(val); memo.push(filter, filter.replace(/\/?$/, '/**/*.js'));
return memo; return memo;
}, },
[] []
) )
.parse(process.argv).filterSpec; .parse(process.argv).filterSpec;
webpackConfig.plugins.push( if (specFilters.length) {
new webpack.DefinePlugin({ const specsPath = /^(?:\.[\\\/])?spec[\\\/]javascripts[\\\/]/;
'process.env.TEST_FILES': JSON.stringify(testFiles),
}) // resolve filters
); let filteredSpecFiles = specFilters.map(filter =>
glob
.sync(filter, {
root: ROOT_PATH,
matchBase: true,
})
.filter(path => path.endsWith('spec.js'))
);
// flatten
filteredSpecFiles = Array.prototype.concat.apply([], filteredSpecFiles);
// remove duplicates
filteredSpecFiles = [...new Set(filteredSpecFiles)];
if (filteredSpecFiles.length < 1) {
fatalError('Your filter did not match any test files.');
}
if (!filteredSpecFiles.every(file => specsPath.test(file))) {
fatalError('Test files must be located within /spec/javascripts.');
}
const newContext = filteredSpecFiles.reduce((context, file) => {
const relativePath = file.replace(specsPath, '');
context[file] = `./${relativePath}`;
return context;
}, {});
webpackConfig.plugins.push(
new webpack.ContextReplacementPlugin(
/spec[\\\/]javascripts$/,
path.join(ROOT_PATH, 'spec/javascripts'),
newContext
)
);
}
webpackConfig.devtool = process.env.BABEL_ENV !== 'coverage' && 'cheap-inline-source-map'; webpackConfig.entry = undefined;
webpackConfig.devtool = 'cheap-inline-source-map';
// Karma configuration // Karma configuration
module.exports = function(config) { module.exports = function(config) {
process.env.TZ = 'Etc/UTC'; process.env.TZ = 'Etc/UTC';
var progressReporter = process.env.CI ? 'mocha' : 'progress'; const progressReporter = process.env.CI ? 'mocha' : 'progress';
var karmaConfig = { const karmaConfig = {
basePath: ROOT_PATH, basePath: ROOT_PATH,
browsers: ['ChromeHeadlessCustom'], browsers: ['ChromeHeadlessCustom'],
customLaunchers: { customLaunchers: {
......
...@@ -69,6 +69,9 @@ const config = { ...@@ -69,6 +69,9 @@ const config = {
test: /\.js$/, test: /\.js$/,
exclude: /(node_modules|vendor\/assets)/, exclude: /(node_modules|vendor\/assets)/,
loader: 'babel-loader', loader: 'babel-loader',
options: {
cacheDirectory: path.join(ROOT_PATH, 'tmp/cache/babel-loader'),
},
}, },
{ {
test: /\.vue$/, test: /\.vue$/,
......
...@@ -62,6 +62,7 @@ describe('.methodName', () => { ...@@ -62,6 +62,7 @@ describe('.methodName', () => {
}); });
}); });
``` ```
#### Testing promises #### Testing promises
When testing Promises you should always make sure that the test is asynchronous and rejections are handled. When testing Promises you should always make sure that the test is asynchronous and rejections are handled.
...@@ -69,9 +70,9 @@ Your Promise chain should therefore end with a call of the `done` callback and ` ...@@ -69,9 +70,9 @@ Your Promise chain should therefore end with a call of the `done` callback and `
```javascript ```javascript
// Good // Good
it('tests a promise', (done) => { it('tests a promise', done => {
promise promise
.then((data) => { .then(data => {
expect(data).toBe(asExpected); expect(data).toBe(asExpected);
}) })
.then(done) .then(done)
...@@ -79,10 +80,10 @@ it('tests a promise', (done) => { ...@@ -79,10 +80,10 @@ it('tests a promise', (done) => {
}); });
// Good // Good
it('tests a promise rejection', (done) => { it('tests a promise rejection', done => {
promise promise
.then(done.fail) .then(done.fail)
.catch((error) => { .catch(error => {
expect(error).toBe(expectedError); expect(error).toBe(expectedError);
}) })
.then(done) .then(done)
...@@ -91,38 +92,37 @@ it('tests a promise rejection', (done) => { ...@@ -91,38 +92,37 @@ it('tests a promise rejection', (done) => {
// Bad (missing done callback) // Bad (missing done callback)
it('tests a promise', () => { it('tests a promise', () => {
promise promise.then(data => {
.then((data) => { expect(data).toBe(asExpected);
expect(data).toBe(asExpected); });
})
}); });
// Bad (missing catch) // Bad (missing catch)
it('tests a promise', (done) => { it('tests a promise', done => {
promise promise
.then((data) => { .then(data => {
expect(data).toBe(asExpected); expect(data).toBe(asExpected);
}) })
.then(done) .then(done);
}); });
// Bad (use done.fail in asynchronous tests) // Bad (use done.fail in asynchronous tests)
it('tests a promise', (done) => { it('tests a promise', done => {
promise promise
.then((data) => { .then(data => {
expect(data).toBe(asExpected); expect(data).toBe(asExpected);
}) })
.then(done) .then(done)
.catch(fail) .catch(fail);
}); });
// Bad (missing catch) // Bad (missing catch)
it('tests a promise rejection', (done) => { it('tests a promise rejection', done => {
promise promise
.catch((error) => { .catch(error => {
expect(error).toBe(expectedError); expect(error).toBe(expectedError);
}) })
.then(done) .then(done);
}); });
``` ```
...@@ -139,7 +139,7 @@ documentation for these methods can be found in the [jasmine introduction page]( ...@@ -139,7 +139,7 @@ documentation for these methods can be found in the [jasmine introduction page](
Sometimes you may need to spy on a method that is directly imported by another Sometimes you may need to spy on a method that is directly imported by another
module. GitLab has a custom `spyOnDependency` method which utilizes module. GitLab has a custom `spyOnDependency` method which utilizes
[babel-plugin-rewire](https://github.com/speedskater/babel-plugin-rewire) to [babel-plugin-rewire](https://github.com/speedskater/babel-plugin-rewire) to
achieve this. It can be used like so: achieve this. It can be used like so:
```javascript ```javascript
// my_module.js // my_module.js
...@@ -181,8 +181,8 @@ See this [section][vue-test]. ...@@ -181,8 +181,8 @@ See this [section][vue-test].
`rake karma` runs the frontend-only (JavaScript) tests. `rake karma` runs the frontend-only (JavaScript) tests.
It consists of two subtasks: It consists of two subtasks:
- `rake karma:fixtures` (re-)generates fixtures * `rake karma:fixtures` (re-)generates fixtures
- `rake karma:tests` actually executes the tests * `rake karma:tests` actually executes the tests
As long as the fixtures don't change, `rake karma:tests` (or `yarn karma`) As long as the fixtures don't change, `rake karma:tests` (or `yarn karma`)
is sufficient (and saves you some time). is sufficient (and saves you some time).
...@@ -217,6 +217,14 @@ yarn karma-start --filter-spec profile/account/components/ ...@@ -217,6 +217,14 @@ yarn karma-start --filter-spec profile/account/components/
yarn karma-start -f vue_shared -f vue_mr_widget yarn karma-start -f vue_shared -f vue_mr_widget
``` ```
You can also use glob syntax to match files. Remember to put quotes around the
glob otherwise your shell may split it into multiple arguments:
```bash
# Run all specs named `file_spec` within the IDE subdirectory
yarn karma -f 'spec/javascripts/ide/**/file_spec.js'
```
## RSpec feature integration tests ## RSpec feature integration tests
Information on setting up and running RSpec integration tests with Information on setting up and running RSpec integration tests with
...@@ -231,14 +239,14 @@ supported by the PhantomJS test runner which is used for both Karma and RSpec ...@@ -231,14 +239,14 @@ supported by the PhantomJS test runner which is used for both Karma and RSpec
tests. We polyfill some JavaScript objects for older browsers, but some tests. We polyfill some JavaScript objects for older browsers, but some
features are still unavailable: features are still unavailable:
- Array.from * Array.from
- Array.first * Array.first
- Async functions * Async functions
- Generators * Generators
- Array destructuring * Array destructuring
- For..Of * For..Of
- Symbol/Symbol.iterator * Symbol/Symbol.iterator
- Spread * Spread
Until these are polyfilled appropriately, they should not be used. Please Until these are polyfilled appropriately, they should not be used. Please
update this list with additional unsupported features. update this list with additional unsupported features.
...@@ -295,11 +303,11 @@ Scenario: Developer can approve merge request ...@@ -295,11 +303,11 @@ Scenario: Developer can approve merge request
[jasmine-focus]: https://jasmine.github.io/2.5/focused_specs.html [jasmine-focus]: https://jasmine.github.io/2.5/focused_specs.html
[jasmine-jquery]: https://github.com/velesin/jasmine-jquery [jasmine-jquery]: https://github.com/velesin/jasmine-jquery
[karma]: http://karma-runner.github.io/ [karma]: http://karma-runner.github.io/
[vue-test]:https://docs.gitlab.com/ce/development/fe_guide/vue.html#testing-vue-components [vue-test]: https://docs.gitlab.com/ce/development/fe_guide/vue.html#testing-vue-components
[RSpec]: https://github.com/rspec/rspec-rails#feature-specs [rspec]: https://github.com/rspec/rspec-rails#feature-specs
[Capybara]: https://github.com/teamcapybara/capybara [capybara]: https://github.com/teamcapybara/capybara
[Karma]: http://karma-runner.github.io/ [karma]: http://karma-runner.github.io/
[Jasmine]: https://jasmine.github.io/ [jasmine]: https://jasmine.github.io/
--- ---
......
...@@ -84,21 +84,11 @@ beforeEach(() => { ...@@ -84,21 +84,11 @@ beforeEach(() => {
const axiosDefaultAdapter = getDefaultAdapter(); const axiosDefaultAdapter = getDefaultAdapter();
let testFiles = process.env.TEST_FILES || [];
if (testFiles.length > 0) {
testFiles = testFiles.map(path => path.replace(/^spec\/javascripts\//, '').replace(/\.js$/, ''));
console.log(`Running only tests matching: ${testFiles}`);
} else {
console.log('Running all tests');
}
// render all of our tests // render all of our tests
const testsContext = require.context('.', true, /_spec$/); const testsContext = require.context('.', true, /_spec$/);
testsContext.keys().forEach(function(path) { testsContext.keys().forEach(function(path) {
try { try {
if (testFiles.length === 0 || testFiles.some(p => path.includes(p))) { testsContext(path);
testsContext(path);
}
} catch (err) { } catch (err) {
console.error('[ERROR] Unable to load spec: ', path); console.error('[ERROR] Unable to load spec: ', path);
describe('Test bundle', function() { describe('Test bundle', function() {
......
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