1 files changed, 5 insertions, 0 deletions
diff --git a/testing/web-platform/tests/infrastructure/server/resources/expect-seen-testharness.js b/testing/web-platform/tests/infrastructure/server/resources/expect-seen-testharness.js
new file mode 100644
index 0000000000..29af1fca55
--- /dev/null
+++ b/testing/web-platform/tests/infrastructure/server/resources/expect-seen-testharness.js
@@ -0,0 +1,5 @@
+test(() => {
+  assert_true('add_completion_callback' in self);
+}, 'add_completion_callback exists');
+
+var scripts = ['expect-seen-testharness.js'];