diff --git a/sbt-app/src/sbt-test/tests/i5609-do-not-discover-testonly/test b/sbt-app/src/sbt-test/tests/i5609-do-not-discover-testonly/test
index f91c91f73..256dbd9f4 100644
--- a/sbt-app/src/sbt-test/tests/i5609-do-not-discover-testonly/test
+++ b/sbt-app/src/sbt-test/tests/i5609-do-not-discover-testonly/test
@@ -1,6 +1,7 @@
 # #5609: When explicitly requested via testOnly, @DoNotDiscover suite should run.
 # First: full test run must exclude @DoNotDiscover (TestSpec2).
 # Second: testOnly with explicit FQN must run TestSpec2.
+# Third: testOnly with a pattern filter (com.test...) — no explicit FQN, so @DoNotDiscover stays excluded.
 
 > clean
 > testFull
@@ -13,3 +14,6 @@ $ absent target/SuiteCompleted-TestSpec2
 > testOnly com.test.TestSpec2
 $ exists target/SuiteStarting-TestSpec2
 $ exists target/SuiteCompleted-TestSpec2
+
+> clean
+> testOnly com.test...