1 files changed, 56 insertions, 0 deletions
diff --git a/testing/web-platform/tests/eventsource/format-field-id-3.window.js b/testing/web-platform/tests/eventsource/format-field-id-3.window.js
new file mode 100644
index 0000000000..3766fbf7bb
--- /dev/null
+++ b/testing/web-platform/tests/eventsource/format-field-id-3.window.js
@@ -0,0 +1,56 @@
+const ID_PERSISTS = 1,
+ID_RESETS_1 = 2,
+ID_RESETS_2 = 3;
+
+async_test(testPersist, "EventSource: lastEventId persists");
+async_test(testReset(ID_RESETS_1), "EventSource: lastEventId resets");
+async_test(testReset(ID_RESETS_2), "EventSource: lastEventId resets (id without colon)");
+
+function testPersist(t) {
+    const source = new EventSource("resources/last-event-id2.py?type=" + ID_PERSISTS);
+    let counter = 0;
+    t.add_cleanup(() => source.close());
+    source.onmessage = t.step_func(e => {
+      counter++;
+      if (counter === 1) {
+          assert_equals(e.lastEventId, "1");
+          assert_equals(e.data, "1");
+      } else if (counter === 2) {
+          assert_equals(e.lastEventId, "1");
+          assert_equals(e.data, "2");
+      } else if (counter === 3) {
+          assert_equals(e.lastEventId, "2");
+          assert_equals(e.data, "3");
+      } else if (counter === 4) {
+          assert_equals(e.lastEventId, "2");
+          assert_equals(e.data, "4");
+          t.done();
+      } else {
+          assert_unreached();
+      }
+  });
+}
+
+function testReset(type) {
+  return function (t) {
+    const source = new EventSource("resources/last-event-id2.py?type=" + type);
+    let counter = 0;
+    t.add_cleanup(() => source.close());
+    source.onmessage = t.step_func(e => {
+      counter++;
+      if (counter === 1) {
+        assert_equals(e.lastEventId, "1");
+        assert_equals(e.data, "1");
+      } else if (counter === 2) {
+        assert_equals(e.lastEventId, "");
+        assert_equals(e.data, "2");
+      } else if (counter === 3) {
+        assert_equals(e.lastEventId, "");
+        assert_equals(e.data, "3");
+        t.done();
+      } else {
+          assert_unreached();
+      }
+    });
+  }
+}