Commits on Oct 7, 2018

1. Make `mach test-unit` not recompile components after `mach build` …

   Previously, the `tests` feature flag of the `embedder_traits` crate
   caused it and every crate recursively depending on it to be built twice.
   
   This feature flag was used to provide a specific set of "resources"
   when running tests. Instead, this commits overrides the `main()` function
   of the test harness to change resources at runtime before running any test.
   
   This is done by adding a dependency that has `name = "test"` in its
   `[lib]` section of `Cargo.toml`. This overrides the crate found by
   `extern crate test;` in code generated by `rustc --test`.

   

   SimonSapin committed Oct 7, 2018

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