Flakey Realtime test attach_when_channel_in_detaching_state in RealtimeChannelTest

[QuintinWillison]

Seen here at 3d252b6:

-> Test attach_when_channel_in_detaching_state[text_protocol](io.ably.lib.test.realtime.RealtimeChannelTest)

io.ably.lib.test.realtime.RealtimeSuite > io.ably.lib.test.realtime.RealtimeChannelTest.attach_when_channel_in_detaching_state[text_protocol] FAILED
    java.lang.AssertionError: 
    Expected: is <detached>
         but: was <attaching>
        at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
        at org.junit.Assert.assertThat(Assert.java:956)
        at org.junit.Assert.assertThat(Assert.java:923)
        at io.ably.lib.test.realtime.RealtimeChannelTest.attach_when_channel_in_detaching_state(RealtimeChannelTest.java:1062)

More detail from build report:

java.lang.AssertionError: 
Expected: is <detached>
     but: was <attaching>
	at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
	at org.junit.Assert.assertThat(Assert.java:956)
	at org.junit.Assert.assertThat(Assert.java:923)
	at io.ably.lib.test.realtime.RealtimeChannelTest.attach_when_channel_in_detaching_state(RealtimeChannelTest.java:1062)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:298)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:292)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.lang.Thread.run(Thread.java:829)

[sync-by-unito]

➤ Automation for Jira commented:

The link to the corresponding Jira issue is https://ably.atlassian.net/browse/SDK-3233