diff --git a/install_test/common_functions.bash b/install_test/common_functions.bash
index 97760eb8..8307c026 100644
--- a/install_test/common_functions.bash
+++ b/install_test/common_functions.bash
@@ -107,6 +107,7 @@ run_planemo() {
     then
         galaxy_root_args="--galaxy_root $GALAXY_ROOT"
     fi
-    planemo --verbose test $galaxy_root_args "$@"
+    MARKDOWN_OUTPUT="${GITHUB_STEP_SUMMARY:-tool_test_output.md}"
+    planemo --verbose test --test_output_markdown "$MARKDOWN_OUTPUT" $galaxy_root_args "$@"
     echo "Tests complete."
 }
diff --git a/tox.ini b/tox.ini
index a2df1fcf..38825d1f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -37,6 +37,7 @@ passenv =
     HOME
     USER
     DRMAA_LIBRARY_PATH
+    GITHUB_STEP_SUMMARY
 
 skip_install =
     lint,dist,install_wheel: True