Document the new behavior of ART run-tests' check step.
Adjust `test/README.md` to mention the separate verification of ART
run-tests' standard output and standard error.
Test: n/a (documentation-only change)
Bug: 171865375
Change-Id: Id7cbbb7a16720b9ab05ca7720df4bd9033957c6a
diff --git a/test/README.md b/test/README.md
index 35a82a2..74fbead 100644
--- a/test/README.md
+++ b/test/README.md
@@ -39,9 +39,10 @@
by `test/etc/default-run`.
After the execution of a run-test, the check step's default behavior
-(implemented in `test/etc/default-check`) is to compare its standard output with
-the contents of the `expected-stdout.txt` file contained in the test's directory;
-any mismatch triggers a test failure.
+(implemented in `test/etc/default-check`) is to respectively compare its
+standard output and standard error with the contents of the
+`expected-stdout.txt` and `expected-stderr.txt` files contained in the test's
+directory; any mismatch triggers a test failure.
The `test/run-test` script handles the execution of a single run-test in a given
configuration. The Python script `test/testrunner/testrunner.py` is a convenient
