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-rw-r--r--utils/lit/tests/selecting.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/utils/lit/tests/selecting.py b/utils/lit/tests/selecting.py
index 72d6fbabdc93..19ba240f9b0f 100644
--- a/utils/lit/tests/selecting.py
+++ b/utils/lit/tests/selecting.py
@@ -7,6 +7,11 @@
# RUN: %{lit} --filter 'o[a-z]e' %{inputs}/discovery | FileCheck --check-prefix=CHECK-FILTER %s
# CHECK-FILTER: Testing: 2 of 5 tests
+# Check that regex-filtering based on environment variables work.
+#
+# RUN: LIT_FILTER='o[a-z]e' %{lit} %{inputs}/discovery | FileCheck --check-prefix=CHECK-FILTER-ENV %s
+# CHECK-FILTER-ENV: Testing: 2 of 5 tests
+
# Check that maximum counts work
#