Improvements to enablePing() & tests (#506)

https://github.com/nbd-wtf/nostr-tools/pull/506

relay.test.ts

@@ -117,3 +117,34 @@ test('publish timeout', async () => {
     ),
   ).rejects.toThrow('publish timed out')
 })
+
+test('ping-pong timeout', async () => {
+  const mockRelay = new MockRelay()
+  const relay = new Relay(mockRelay.url, { enablePing: true })
+  relay.pingTimeout = 50
+  relay.pingFrequency = 50
+
+  let closed = false
+  const closedPromise = new Promise<void>(resolve => {
+    relay.onclose = () => {
+      closed = true
+      resolve()
+    }
+  })
+
+  await relay.connect()
+  expect(relay.connected).toBeTrue()
+
+  // wait for the first ping to succeed
+  await new Promise(resolve => setTimeout(resolve, 75))
+  expect(closed).toBeFalse()
+
+  // now make it unresponsive
+  mockRelay.unresponsive = true
+
+  // wait for the second ping to fail
+  await closedPromise
+
+  expect(relay.connected).toBeFalse()
+  expect(closed).toBeTrue()
+})