1 files changed, 40 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/microtasks/checkpoint-importScripts.any.js b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/microtasks/checkpoint-importScripts.any.js
new file mode 100644
index 0000000000..8791a099b6
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/microtasks/checkpoint-importScripts.any.js
@@ -0,0 +1,40 @@
+// META: global=dedicatedworker,sharedworker
+
+// The `then` handlers for `Promise.resolve()` are evaluated in the first
+// microtasks checkpoint after `Promise.resolve()`.
+
+// ----------------------------------------------------------------
+// Check when microtasks checkpoint is performed around importScripts().
+
+// The expectation is: the `then` handlers are evaluated after the script
+// calling importScripts() is finished, not immediately after importScripts().
+// Although #clean-up-after-running-script is executed as a part of
+// #run-a-classic-script for importScripts()ed scripts, but at that time
+// microtasks checkpoint is NOT performed because JavaScript execution context
+// stack is not empty.
+
+self.log = [];
+
+// Microtasks should be executed before
+// #run-a-classic-script/#run-a-module-script is completed, and thus before
+// script evaluation scheduled by setTimeout().
+async_test(t => {
+  self.addEventListener('error',
+      t.unreached_func('error event should not be fired'));
+
+  t.step_timeout(() => {
+      assert_array_equals(log, [
+          'importScripts()ed script',
+          'catch',
+          'promise'
+        ]);
+      t.done();
+    },
+    0);
+}, "Promise resolved during importScripts()");
+
+try {
+  importScripts('resources/resolve-then-throw.js');
+} catch (e) {
+  self.log.push('catch');
+}