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Document the VS Code extension test framework

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Ryan Cumming 2019-06-26 21:36:40 +10:00
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docs/dev/README.md
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@ -97,6 +97,25 @@ To work on the VS Code extension, launch code inside `editors/code` and use `F5`
to launch/debug. To automatically apply formatter and linter suggestions, use
`npm run fix`.
Tests are located inside `src/test` and are named `*.test.ts`. They use the
[Mocha](https://mochajs.org) test framework and the builtin Node
[assert](https://nodejs.org/api/assert.html) module. Unlike normal Node tests
they must be hosted inside a VS Code instance. This can be done in one of two
ways:
1. When `F5` debugging in VS Code select the `Extension Tests` configuration
from the drop-down at the top of the Debug View. This will launch a temporary
instance of VS Code. The test results will appear in the "Debug Console" tab
of the primary VS Code instance.
2. Run `npm test` from the command line. Although this is initiated from the
command line it is not headless; it will also launch a temporary instance of
VS Code.
Due to the requirements of running the tests inside VS Code they are **not run
on CI**. When making changes to the extension please ensure the tests are not
broken locally before opening a Pull Request.
# Logging
Logging is done by both rust-analyzer and VS Code, so it might be tricky to