Test Runner with Instant Actionable Results

Wallaby.js runs your JavaScript and TypeScript tests immediately as you type, displaying results next to your code.

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  • Instant Actionable
    Feedback
  • Time Travel
    Debugger
  • Practical
    Test Insights

Why Wallaby?

Test execution results, including code coverage, are displayed and updated in realtime right where you need to see them β€” in your code editor, next to the line of code that you're editing. Say goodbye to context switching.

The tool is insanely fast because it calculates and runs the absolute minimum set of tests affected by your code changes; often only a single test needs to be run. No other testing tool is capable of operating on this level.

There is no vendor, API or framework lock-in when using Wallaby.js, because the tool is a plugin for your existing testing/UI framework and IDE. You will always be able to run your tests without Wallaby.js if you need to.

Choose your weapons

Code Editor
Application type
Testing tool

For your React application, Wallaby can run your Jest tests in VS Code faster, provide a debugging experience that has been designed for your tests that works more efficiently, and provide realtime granular test results that are more helpful.

efficiency without wallaby

efficiency with wallaby

Show me why
Show me how
Blazingly Fast
Blazingly Fast Test Execution

Tests run immediately as you type, on unsaved changes, in parallel if required; no need to do anything manually. Wallaby knows how your code and tests relate, so after a change only the minimum set of tests need to re-run; no other tool is capable of operating like this. No matter how large your project grows, feedback is almost instant.

Time Travel Debugging
Time Travel Debugging

Move forward and backwards through your code to understand the conditions that led to a specific bug. Wallaby's Time Travel Debugger accelerates your edit, compile and debug loop by allowing you to jump to a specific line of code, view runtime values, edit-and-continue and step into, over and out of your code.

Smart Start
Smart Start

Wallaby's Smart Start and Exclusive Test Run features allow running only the test files that you are currently working on. When opening or editing test files, Wallaby will start running them. Running a limited set of tests is usually many times faster than running all tests within your project and provides a highly productive workflow.

Inline Runtime Values
Inline Runtime Values

See the results of console.log and runtime variables in your editor, right next to your code. Show and copy expression values with editor commands, accessible using keyboard shortcuts. Wallaby's special comment format can also be used to evaluate expressions and includes the ability to measure code execution times.

Inline Error Reporting
Inline Error Reporting

Error messages are displayed right next to the code that caused them. Gutter indicators show if the current line of code is the source of an error, or if it's on the execution path of a failing test or error. Editor commands (with keyboard shortcuts) allow you to quickly navigate to the associated failing test or error source.

Inline Code Coverage
Inline Code Coverage

Indicators in the gutter of your code editor are constantly updated in realtime to display test coverage so you can quickly see which lines of code are fully covered, only partially covered or not covered at all. Editor commands can be used to toggle uncovered regions to see exactly which parts of your code have not been executed.

Test and Coverage Explorer
Test and Coverage Explorer

A strategic-level view of your project's tests and code coverage is available through a comprehensive side view. Open files in your editor from your browser as you explore your tests and code-coverage. Sort and filter by name, duration, passing / failing tests, and code coverage. You can also exclude code from coverage calculations.

Runtime Value Explorer
Runtime Value Explorer

Wallaby's Value Explorer allows non-primitive runtime values to be viewed and explored in an easy-to-navigate real-time treeview. This feature is great for exploring larger objects and makes debugging with Wallaby easier and faster. The tree can be expanded to any depth and paths / values can be copied directly to the clipboard.

Interactive Tests Output
Interactive Tests Output

Test execution results are ergonomically displayed in your editor's output window. All tests that are currently failing are listed, along with errors, diffs/snapshots, error stacks and any console.log calls. The output window's hyperlinks allow you to navigate directly to files in your editor, for example to the exact error line, or to a broken test.

Test Stories
Test Story Viewer

Inspect the code that your test is executing in a single logical view. Wallaby's Test Story Viewer allows you to see your test execution trace without having to jump between multiple functions or code files. It is ideal for both reading and debugging code. Quickly see covered lines of code, step into, over and out of your code, and view runtime values.

Test Profiler
Test Profiler

Wallaby's Test Profiler allows you to quickly record a test's CPU usage profile to analyze its runtime performance. In addition to your own test and code files, your external dependencies code is also profiled. You can quickly navigate to a section of code you want to review by clicking on the hotspot in the profile viewer.

Enhanced Diffs & Snapshots
Enhanced Diffs & Snapshots

When errors contain expected vs. actual values, Wallaby displays compact diffs in editor hover tips and in Wallaby's output window. A command allows you to see the diff in a side-by-side view. Jest snapshot test support includes editor commands to update snapshots for your current test, current file, or your entire project.

How much will Wallaby help me?

We estimate that using Wallaby's basic features alone will make your coding 10.84% more efficient and will save you $2396 per year.

But don't take our word for it. See what our customers have to say below and try it for free to see for yourself.

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10,000+ companies all over the world, including many Fortune 500 companies, have increased their productivity and output by using Wallaby.js.

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