Fake Font Provider

Have you ever found yourself needing a component that responds to fuchsia.fonts.Provider FIDL requests, but doesn't provide any actual font files? Then fake_fonts is for you!

fake_fonts.cm can serve as a drop-in replacement for fonts.cm in tests and on products that need to satisfy a dependency on fuchsia.fonts.Provider, but don't actually render text or do not care what rendered text looks like.

Usage

In tests

1. Add "//src/fonts/fake:fake-fonts-cm" to the deps parameter of your fuchsia_test_package().

2. Set up the capability routing.

   a. Add a child component:

   {
       name: "fake_fonts",
       url: "fuchsia-pkg://fuchsia.com/<your-test-package>#meta/fake_fonts.cm",
   }
   

   b. Add an offer entry for fake_fonts' dependencies:

   {
       protocol: [ "fuchsia.logger.LogSink" ],
       from: "parent",
       to: [ "#fake_fonts" ],
   }
   

   c. Offer protocol "fuchsia.fonts.Provider" from #fake_fonts to your test.

For an example, see ./meta/fake_fonts_test.cml.

In a product configuration

1. Remove "//src/fonts" and any font collections (e.g. "//src/fonts:open-fonts-collection") from the product definition. If these were added in an inherited product configuration, the removal can be done using legacy_base_package_labels -= [...] in the child product configuration.

2. Add "//src/fonts/fake:pkg" to the product's packages (again, usually legacy_base_package_labels).

3. Add "//src/fonts/fake:core-shard" to core_realm_shards.

Testing

To verify that the fake_fonts component correctly responds to all font queries with empty or error responses:

fx set core.x64 --with //src/fonts/fake:tests
# ...
fx test //src/fonts/fake