FIDL test libraries

This directory contains the FIDL test libraries used for golden files.

Add a new library

To add a new standalone library:

1. Choose a name, e.g. foo_bar.
2. Create a FIDL file with the .test.fidl extension, e.g. foo_bar.test.fidl.
3. Declare the library as test. followed by name without underscores, e.g. library test.foobar;.
4. Add the filename to the standalone_libraries list in BUILD.gn.
5. Add an entry to fidl_testdata_info in info.gni, providing the name and the target that BUILD.gn generates, e.g.:

{
  name = "foo_bar"
  target = "//tools/fidl/fidlc/testdata:test.foobar"
}

Add a new library with dependencies

To add a new library with dependencies, you must create a subdirectory containing multiple FIDL files. This should only be done to accommodate dependencies, not to group together similar standalone libraries.

1. Choose a name, e.g. foo_bar.
2. Create a subdirectory named name containing two or more FIDL files ending in .test.fidl and a BUILD.gn to build them.
3. Ensure one of the libraries is named appropriately, e.g. test.foobar, and that its build target name is the same.
4. Add an entry to fidl_testdata_info in info.gni, providing the name and the target that BUILD.gn generates, e.g.:

{
  name = "foo_bar"
  target = "//tools/fidl/fidlc/testdata/foo_bar:test.foobar"
}

Golden tests

FIDL tools in //tools/fidl use the test libraries as input when defining golden tests with //build/testing/golden_test.gni.

To regenerate all goldens, run fx regen-goldens fidl.

To test goldens, run fx test ${TOOL}_golden_tests for the specific tool, e.g. fx test fidlc_golden_tests.