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Add missing Compiler Selectors heading #2548

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14 changes: 12 additions & 2 deletions pkgs/test/README.md
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Expand Up @@ -371,6 +371,16 @@ only supports boolean operations. The following identifiers are defined:
* `posix`: Whether the test is running on a POSIX operating system. This is
equivalent to `!windows`.

### Compiler Selectors

Compiler selectors use the [boolean selector syntax] defined in the
[`boolean_selector`] package, which is a subset of Dart's expression syntax that
only supports boolean operations. The following identifiers are defined:

[boolean selector syntax]: https://github.com/dart-lang/boolean_selector/blob/master/README.md

[`boolean_selector`]: https://pub.dev/packages/boolean_selector

* `dart2js`: Whether the test has been compiled with Dart2Js.

* `dart2wasm`: Whether the test has been compiled with Dart2Wasm.
Expand All @@ -379,8 +389,8 @@ only supports boolean operations. The following identifiers are defined:

* `source`: Whether the test has been run with no compiler (from source).

For example, if you wanted to run a test on every browser but Chrome, you would
write `@TestOn('browser && !chrome')`.
For example, if you wanted to run a test on every browser but Chrome, using the Dart2Js compiler, you would
write `@TestOn('browser && !chrome && dart2js')`.

### Running Tests on Node.js

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