Some links on this page are affiliate links: if you buy through them we may earn a commission, at no extra cost to you.
If describe, it, expect, or beforeEach is undefined, first check how Jasmine’s interface is initialized and whether the files containing your helpers and specs actually load. Treat Chrome’s headless launch as a separate issue: a browser can start successfully while the test page still lacks Jasmine’s functions. The exact fix depends on whether you run Jasmine in Node.js, with jasmine-browser-runner, or through Karma.
Start by identifying where the test runs
Jasmine can run in Node.js or in a browser, and the setup path differs. Before changing Chrome flags or reinstalling packages, identify the runner and runtime from the command used to start tests and the project’s configuration.
- Node.js: The test process runs in Node. In Jasmine 4.0 and later, a Node.js project can deliberately disable global functions and import the Jasmine interface instead.
- Browser runner:
jasmine-browser-runnerruns browser tests and has configuration for source files, helpers, and specs. It also handles.mjsfiles as ES modules. - Karma: Karma serves and runs tests in a browser. Its Jasmine framework integration and loaded test files are separate from the Chrome launcher.
Do not infer the cause from the word “Headless” in the command. ChromeHeadless selects a browser launch mode; it does not, by itself, install Jasmine’s interface into the page.
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Read the first error and identify the missing symbol
Use the earliest relevant error in the test output, not a later cascade of failures. Jasmine’s documented interface includes describe, it, expect, and lifecycle functions such as beforeEach. If one of those names is undefined at the top of a spec, investigate Jasmine initialization and file loading first. If the error instead names an application function called from inside a spec, Jasmine may already be running; debug the application import or setup that defines that function.
#1 Best Overall
- individuals with color vision defect should see a different figure from individuals with normal color vision.
- Makes use of the peculiarity that in red-green blindness, blue and yellow appear remarkably bright compared with red and green
- Diagnostic plates: intended to determine the type of color vision defect
- Ishihara Test Chart Books for Color Deficiency 24 Plates with usar manual
- Copy the first stack trace and note the file and line where the missing name is used.
- Check whether the name is a Jasmine API or a function belonging to your application.
- Confirm which runner executed the spec and whether the run reached the test page.
- Inspect the runner configuration for framework setup and the order and format of source, helper, and spec files.
This separation matters: a launcher error usually means Chrome did not start or could not be reached; an undefined Jasmine API points to the test environment or interface. A successful Chrome launch does not prove that Jasmine loaded correctly.
Fix Node.js tests that intentionally disable globals
Jasmine 4.0 and later supports Node.js use without global functions. If the project creates a Jasmine instance with globals: false, specs cannot assume that describe and it were added to the global scope. Import the interface explicitly, or change the configuration if the project intends to use globals. This is a Node.js configuration, not a general browser fix.
Explicitly import the no-globals interface
The Jasmine guide documents obtaining the interface from jasmine-core. For example, in a CommonJS spec or helper:
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
const { describe, it, expect, beforeEach, jasmine } =
require('jasmine-core').noGlobals();
describe('sum', () => {
it('adds two numbers', () => {
expect(2 + 3).toBe(5);
});
});Use the same interface consistently in the files that need Jasmine APIs. If your project uses ES modules, adapt the imports to its module system rather than mixing CommonJS and ESM blindly.
Alternatively, enable globals intentionally
If the specs were written to use global names, inspect the code that constructs the Jasmine runner and remove the no-globals setting or configure the runner to provide globals. Do not change this setting without checking how other tests and helpers are written; mixing implicit globals in some files with explicit imports in others can make setup harder to follow.
Official reference: Jasmine: using Jasmine without globals.
Check browser-runner configuration and file order
For browser tests, verify that the runner is configured to load the intended source files, helpers, and specs. A missing spec file can look like tests are not running; a helper that should initialize state but never loads can produce undefined names later. Check file paths, filename patterns, module format, and the runner’s startup output.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minutePC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11- Confirm the files are included by the active configuration, not merely present in the repository.
- Check that setup files load before the specs that depend on them.
- If a file uses
.mjs, confirm that the runner treats it as an ES module and that its imports resolve. - Check whether the project expects Jasmine globals or imports an interface explicitly; make the spec style match the runner configuration.
jasmine-browser-runner documents configuration for spec, helper, and source files, as well as the headlessChrome browser choice. Consult its configuration documentation for the syntax appropriate to the version installed: jasmine-browser-runner documentation.
Check Karma’s Jasmine setup separately from Chrome
In a Karma project, confirm both that Jasmine is configured as the test framework and that the browser receives the framework and spec files. Then check whether the Chrome launcher itself starts. These are distinct checks: changing the launcher cannot repair a missing Jasmine interface, and adding Jasmine files cannot fix an executable-path or browser-startup failure.
Karma’s Chrome launcher uses ChromeHeadless as a browser option and documents configuring a Puppeteer executable path. Use the launcher’s instructions for your installed version and environment: karma-chrome-launcher README.
Chrome for Developers describes headless browser testing as a way to execute browser tests in the same environment as site users. Its example uses Karma with Mocha and Chai, not Jasmine, so it should not be copied as Jasmine configuration: Automated testing with Headless Chrome.
Compare the setup paths before changing configuration
| Path | Where Jasmine runs | Interface check | File-loading check | Browser check |
|---|---|---|---|---|
| Jasmine in Node.js | Node.js process | If globals are disabled, obtain the interface with noGlobals() or configure globals as intended. |
Confirm helpers and specs are part of the run and use the expected module format. | Not applicable unless the project separately launches a browser. |
jasmine-browser-runner |
Browser test page | Verify the runner’s Jasmine setup and whether specs expect globals. | Check configured source, helper, and spec files, including ESM handling. | Confirm the configured browser, such as documented headlessChrome, launches. |
| Karma with Jasmine | Browser test page managed by Karma | Verify Jasmine framework integration is active. | Check that framework and test files are included and served in the needed order. | Verify ChromeHeadless and Chrome’s executable or Puppeteer path separately. |
Troubleshoot by symptom
describe or it is undefined at the start of a spec
Likely area to inspect: interface initialization, no-globals configuration, or whether the runner loaded the expected Jasmine setup. In Node.js with globals disabled, import the documented interface. In a browser runner, inspect its configuration and loaded scripts rather than assuming Chrome is responsible.
beforeEach or expect is undefined, while another Jasmine name works
Check for inconsistent imports, shadowed names, or a partial/custom interface setup. Compare the failing file with a working spec and verify that the same setup applies to both.
The spec never appears to execute
Check configured spec paths and filename patterns, then check whether the helper or source files load before the spec. A runner can start without having selected the file you expected.
The error names an application function, not a Jasmine API
Do not “fix” Jasmine globals if describe, it, and expect are already available. Inspect the application module import, setup helper, or source-file inclusion that should define the missing function.
Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Chrome does not launch or connect
Treat this as a launcher problem. Verify the selected browser name and, where relevant, the configured Chrome or Puppeteer executable path against the launcher documentation. Once the browser starts, continue to check Jasmine initialization independently.
Best Value
Reliability and version checks
Check the versions actually installed in the project before applying a configuration example from a different release. Jasmine’s release notes list Chrome 143 as a tested environment for Jasmine 6.0; that is a release-specific tested environment, not a blanket compatibility guarantee for other Jasmine versions, browser versions, or operating systems: Jasmine 6.0 release notes. The available documentation does not establish one universal cause or frequency for missing globals. A project-specific diagnosis needs the first error, runner, package versions, relevant config, and file-loading setup.
For Jasmine’s global API reference, see Jasmine global API.
Or skip the browser setup
ScreenshotNeo is a website screenshot API, not a Jasmine runner or a fix for missing Jasmine functions. If your separate goal is to capture a page without installing and managing a browser locally, it can return an image or PDF from one GET request. Example cURL request:
Free tools Windows power users keep installed
One-click scans. No signup required.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation. It removes cookie and consent banners, newsletter popups, and chat widgets before capture; bot checks, blank pages, and failed loads are not billed. Its MCP server provides screenshot tools for AI agents, and the free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Those are capture-service features, not substitutes for configuring Jasmine in your test runner. Learn more at ScreenshotNeo, or sign up for 1,000 free screenshots a month with no card.
Frequently Asked Questions
Does Headless Chrome remove Jasmine’s global functions?
The documented distinction is that ChromeHeadless selects the browser launch mode, while Jasmine interface setup and test-file loading are separate. Check the runner configuration before attributing undefined Jasmine APIs to Chrome.
Which details are needed to diagnose a particular project?
The first relevant stack trace, Jasmine and runner versions, the command used to run tests, and the configuration that selects framework, browser, helpers, and specs.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
