TypeScript uses a large set of compiler testcases to detect unexpected changes in the compiler behavior.

Running the Tests

To run all tests, invoke the runtests target using jake:
jake runtests

This will also include language service tests; to run only the compiler tests, add the flag:
jake runtests tests=--compiler

Adding a Test

To add a new testcase, simply place a .ts file in tests\cases\compiler containing code that exemplifies the bugfix or change you are making.

These files support metadata tags in the format // @name: value . The supported names and values are:
* comments, sourcemap, noimplicitany, declaration: true or false (corresponds to the compiler command-line options of the same name)
* target: ES3 or ES5 (same as compiler)
* out, outDir: path (same as compiler)
* module: local, commonjs, or amd (local corresponds to not passing any compiler --module flag)

Note that if you have a test corresponding to a specific spec compliance item, you can place it in tests\cases\conformance in an appropriately-named subfolder. Note that filenames here must be distinct from all other compiler testcase names, so you may have to work a bit to find a unique name if it’s something common.

Managing the Baselines

Compiler testcases generate baselines that track the emitted .js, the errors produced by the compiler, and the type of each expression in the file. Additionally, some testcases opt in to baselining the source map output.

When a change in the baselines is detected, the test will fail and a diff will be written to the file baseline-report.html. After verifying that the changes in the baselines are correct, run
jake baseline-accept

to establish the new baselines as the desired behavior. This will change the files in tests\baselines\reference, which should be included as part of your commit. It's important to carefully validate changes in the baselines.

Note that baseline-accept should only be run after a full test run! Accepting baselines after running a subset of tests will delete baseline files for the tests that didn't run.

Last edited Mar 24, 2014 at 11:03 PM by RyanCavanaugh, version 1


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