Contributor testing docs improvement (#969)

* initial

* Update CONTRIBUTING.md

Co-authored-by: Justin Starry <justin.m.starry@gmail.com>
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yossarian 2020-02-27 01:53:28 +01:00 committed by GitHub
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@ -27,7 +27,9 @@ cargo build --target wasm32-unknown-unknown
```
#### Test
For the tests to work one have to ensure that `wasm-bindgen-cli` is installed.
##### Web Tests
First, ensure that `wasm-bindgen-cli` is installed.
[Instructions](https://rustwasm.github.io/docs/wasm-bindgen/wasm-bindgen-test/usage.html#install-the-test-runner)
Additionally a webdriver must be installed locally and configured to be on the
@ -38,6 +40,13 @@ although more driver support may be added! You can download these at:
* chromedriver - http://chromedriver.chromium.org/downloads
* safaridriver - should be preinstalled on OSX
##### Macro Tests
When adding or updating tests, please make sure you have updated the appropriate `stderr` file, which you can find [here](https://github.com/yewstack/yew/tree/master/tests/macro) for the `html!` macro. These files ensure that macro compilation errors are correct and easy to understand.
To update or generate a new `stderr` file you can run `TRYBUILD=overwrite cargo test --test macro_test` or `TRYBUILD=overwrite cargo test --test derive_props_test`.
##### Running Tests
```bash
./ci/run_tests.sh
```