chore: add test for ws ping/pong (#18204)

This commit adds test for https://github.com/denoland/deno/issues/17761
which was fixed by https://github.com/denoland/deno/pull/17762. Verified
that test fails on Deno 1.30.1

1 files changed, 17 insertions, 0 deletions

diff --git a/cli/tests/unit/websocket_test.ts b/cli/tests/unit/websocket_test.ts
index b0379fac9..6737edc11 100644
--- a/cli/tests/unit/websocket_test.ts
+++ b/cli/tests/unit/websocket_test.ts
@@ -19,3 +19,20 @@ Deno.test(async function websocketConstructorTakeURLObjectAsParameter() {
   };
   await promise;
 });
+
+// https://github.com/denoland/deno/pull/17762
+// https://github.com/denoland/deno/issues/17761
+Deno.test(async function websocketPingPong() {
+  const promise = deferred();
+  const ws = new WebSocket("ws://localhost:4245/");
+  assertEquals(ws.url, "ws://localhost:4245/");
+  ws.onerror = () => fail();
+  ws.onmessage = (e) => {
+    ws.send(e.data);
+  };
+  ws.onclose = () => {
+    promise.resolve();
+  };
+  await promise;
+  ws.close();
+});