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Use Jasmine to define JavaScript tests, Karma to run them in a browser, and Travis CI to run the same test command in a hosted build. For CI, configure Karma for a single run and make the project’s npm test script invoke it; Karma then exits with a status Travis can use to pass or fail the job.
How Jasmine, Karma, and Travis CI fit together
These tools have separate jobs:
- Jasmine provides the test framework, including specs and expectations. Its documentation describes it as a framework for testing JavaScript in browsers and Node.js.
- Karma is the browser test runner. The
karma-jasmineadapter connects Jasmine to Karma, which loads the configured files into a browser. - Travis CI installs project dependencies and runs the test command in a hosted build job.
The flow is Jasmine specs and expectations → Karma browser execution and reporting → a repeatable Travis job. This separates writing tests from choosing where and how they run.
Install the project dependencies
Karma’s installation guide recommends installing it as a local development dependency. For a Jasmine suite using Chrome, install the runner, adapter, launcher, and Jasmine core:
npm install --save-dev karma karma-jasmine karma-chrome-launcher jasmine-coreThe launcher is a plugin that lets Karma start Chrome. Frameworks, reporters, preprocessors, and launchers are generally separate Karma plugins; install the integrations your configuration uses.
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Configure Karma to load Jasmine tests
Create or update karma.conf.js. This example shows the core settings; adjust the globs and browser name to match your project and installed launcher:
// karma.conf.js
module.exports = function (config) {
config.set({
frameworks: ['jasmine'],
files: ['src/**/*.js', 'spec/**/*.js'],
browsers: ['ChromeHeadless'],
singleRun: true
});
};frameworks: ['jasmine'] selects the adapter, while files tells Karma which source and spec files to load. Check these patterns against the actual directory layout: a spec omitted from the file list will not run, and loading the same file through multiple paths can cause it to be included twice.
Jasmine also has its own configuration model, with runner settings for spec files, helper files, source files, and Node requires. In browser tests, keep Jasmine’s file-loading rules aligned with Karma’s files list so the intended tests and helpers are present exactly once.
Make the Travis job run tests and exit
CI needs a finite command rather than a Karma process that waits for file changes. Set singleRun: true in Karma, as in the example above, or pass --single-run when starting it. Karma defines this mode to start and capture configured browsers, run tests, then exit with status 0 if all pass or 1 if any fail. Travis can use that process status to mark the build.
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Put the command in package.json so the same test entry point can be used locally and in CI:
{
"scripts": {
"test": "karma start --single-run"
}
}A minimal .travis.yml can select Node.js and call that script:
language: node_js
node_js:
- lts/*
script:
- npm testTravis’s JavaScript guide describes dependency installation followed by npm test as the default Node workflow. Use a lockfile so Travis can use npm ci where supported; choose and pin a Node version or matrix deliberately because supported releases and build images change.
Diagnose ChromeHeadless startup failures
ChromeHeadless is a common CI target because it runs without a visible desktop, but Karma still needs both a working browser installation and its launcher. Travis documents a Chrome add-on and headless mode. In some container-based Linux environments, Chrome cannot use its sandbox and may require --no-sandbox. Treat that as an environment-specific workaround, not a universal default, and review its security implications for the runner.
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- Confirm Chrome and the launcher are available. Check the Travis image or add-on configuration and verify that
karma-chrome-launcheris installed. - Read the startup failure in the job log. Look for sandbox errors, browser startup failures, or capture timeouts before changing Karma settings.
- Adjust timeouts only with evidence. Karma provides browser socket and no-activity timeout settings. Increase them only if the CI environment is demonstrably slow; a very long timeout can make a hung browser harder to identify.
Reproduce failures and debug locally
Jasmine randomizes spec order by default to reveal tests that depend on execution order. When a failure appears order-dependent, record the reported seed and rerun with that seed to reproduce the ordering. Jasmine allows randomization to be disabled, but its guide does not recommend that as the default.
For interactive local debugging, run Karma without singleRun and enable watching, or open Karma’s browser URL in a regular browser. Keep the non-interactive single-run command for CI, where verbose logging and the preserved Travis job log help diagnose failures. A passing local watch run does not establish that the headless browser, Node version, and CI environment match.
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