Diagnostics Streams is an experimental library for writing logs in the log encoding. The library will eventually be merged into the fuchsia_logger library in //sdk/dart and should not be used directly.
Unit tests for Diagnostic Streams are available in the fuchsia-diagnostic-streams-unittests package. To run these tests, include --with //bundles:tests in the fx set invocation and run the following command:
$ fx test fuchsia-diagnostic-streams-unittests
Public members of the library are exposed in lib/streams.dart. Private implementations are in lib/src/*. Unit tests may be found in test/*.