Add docs to README.md

carbon-language · Aug 22, 2024 · 7adca0a · 7adca0a
1 parent 7c3f8c7
commit 7adca0a
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/testing/file_test/README.md b/testing/file_test/README.md
@@ -123,6 +123,11 @@ Supported comment markers are:
 
         Replaced with `${TEST_TMPDIR}/temp_file`.
 
+    -   `%{identifier}`
+
+        Replaces some implementation-specific identifier with a value. (Mappings
+        provided by way of an optional `MyFileTest::GetArgReplacements`)
+
     ARGS can be specified at most once. If not provided, the FileTestBase child
     is responsible for providing default arguments.