GraalVM JavaScript publishes tests that can be used to verify the correctness of commits. A pull request against our codebase can only be accepted when all tests pass.
Test runners for different externally published test sets are provided.
ECMAScript's official testsuite:
$ mx test262 gate
Tests provided by the V8 project:
$ mx testv8 gate
All test runners should result in 0 (unexpected) failures. Note that we maintain an ignore list of tests we know not to pass currently. A test not expected to pass typically means it tests a feature not yet supported by our engine. The tests runners suggest to automatically update those lists based on the tests results (add or remove known-to-fail tests from those lists).
You can run individual tests with this command:
$ mx test262 single=built-ins/Array/length.js
This allows you to debug problems when working on the engine's codebase.
Use mx -d ... to connect with a debugger to this process.
GraalVM JavaScript is also published with its own unit tests. To execute them use:
$ mx unittest com.oracle.truffle.js
This should result in a passing result as well (e.g. OK (435 tests)).
Consider contributing your own unittests when working on GraalVM JavaScript.