This directory contains common placeholder FIDL protocols and implementations that can be used in tests:

• placeholders.test.fidl: FIDL library containing a simple Echo FIDL protocol definition.
• echo_server_placeholder: Component that implements and serves the test.placeholders.Echo protocol. Available as an individual component or in a single-component package.
• echo_client_placeholder: Component that connects to an implementation of the test.placeholders.Echo protocol. Available as an individual component or in a single-component package.