Make it easy to write embedder unit tests by creating a fixture and config builder. (#8276)
All embedder unit-tests have to setup the Flutter project arguments from scratch before launching the engine. The boilerplate and having to deal with the low level C API during each engine launch is a hinderance to writing tests. This patch introduces an EmbedderTest fixture that sets up all the embedder side snapshots before allowing the unit test to create a FlutterConfigBuilder` that the test can use to incrementally build and edit the Flutter project configuration. From the given state state of a configuration, multiple engines can be launched with their lifecylces managed by appropriate RAII wrappers. This allows the a fully configured Flutter engine to be launched using 4 lines of code in a fixture. ``` EmbedderConfigBuilder builder; builder.SetSoftwareRendererConfig(); builder.SetAssetsPathFromFixture(this); builder.SetSnapshotsFromFixture(this); auto engine = builder.LaunchEngine(); ```
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