lib/src/test/java/io/ably/lib/test/realtime/RealtimeChannelTest.java (2)

1739-1745: Refactor state sequence assertions to improve test robustness

Asserting the exact size and order of channelStates can make the test brittle to future changes in state transitions. Consider verifying the sequence of key states without hardcoding their positions.

Apply this diff to refactor the assertions:

- Assert.assertEquals(4, channelStates.size());
- Assert.assertEquals(ChannelState.attaching, channelStates.get(0));
- Assert.assertEquals(ChannelState.attached, channelStates.get(1));
- Assert.assertEquals(ChannelState.attaching, channelStates.get(2));
- Assert.assertEquals(ChannelState.attached, channelStates.get(3));
+ List<ChannelState> expectedStates = Arrays.asList(
+     ChannelState.attaching,
+     ChannelState.attached,
+     ChannelState.attaching,
+     ChannelState.attached
+ );
+ Assert.assertTrue(channelStates.containsAll(expectedStates));

---

1795-1802: Refactor assertions to enhance test maintainability

Directly asserting the size and exact order of channelStates may lead to brittle tests. It's advisable to verify the presence and order of important states to make the test more resilient to future changes.

Consider the following refactor:

- Assert.assertEquals(5, channelStates.size());
- Assert.assertEquals(ChannelState.attaching, channelStates.get(0));
- Assert.assertEquals(ChannelState.attached, channelStates.get(1));
- Assert.assertEquals(ChannelState.suspended, channelStates.get(2));
- Assert.assertEquals(ChannelState.attaching, channelStates.get(3));
- Assert.assertEquals(ChannelState.attached, channelStates.get(4));
+ List<ChannelState> expectedStates = Arrays.asList(
+     ChannelState.attaching,
+     ChannelState.attached,
+     ChannelState.suspended,
+     ChannelState.attaching,
+     ChannelState.attached
+ );
+ Assert.assertTrue(channelStates.containsAll(expectedStates));

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lib/src/test/java/io/ably/lib/test/realtime/RealtimeChannelTest.java (3)

Line range hint 1791-1840: Consider a more descriptive test name.

The test thoroughly validates the channel state transitions and error propagation. However, consider renaming it to better describe the test scenario, e.g., test_server_initiated_detach_transitions_attached_channel_through_attaching_to_attached.

---

Line range hint 1849-1902: Consider extracting common setup code.

The test thoroughly validates the channel state transitions and error propagation. However, there's significant setup code duplication with server_initiated_detach_for_attached_channel. Consider extracting the common setup into a helper method.

+    private void setupChannelAndWaitForState(String channelName, ChannelState targetState, ErrorInfo error) throws AblyException {
+        Channel channel = ably.channels.get(channelName);
+        ChannelWaiter channelWaiter = new ChannelWaiter(channel);
+        channel.attach();
+        channelWaiter.waitFor(ChannelState.attached);
+        if (error != null) {
+            channel.setSuspended(error, true);
+            channelWaiter.waitFor(targetState);
+        }
+        return new ChannelTestContext(channel, channelWaiter);
+    }

---

1164-1231: Enhance assertion messages for better test failure diagnostics.

The test thoroughly validates error handling in detach operations. However, the assertions could benefit from more descriptive messages to help diagnose test failures.

-            assertFalse(detachWaiter1.success);
-            assertNotNull(detachWaiter1.error);
-            assertEquals("Connection is closing", detachWaiter1.error.message);
-            assertEquals(80001, detachWaiter1.error.code);
+            assertFalse("Detach should fail when connection is closing", detachWaiter1.success);
+            assertNotNull("Error should be present for failed detach", detachWaiter1.error);
+            assertEquals("Error message should indicate connection closing", "Connection is closing", detachWaiter1.error.message);
+            assertEquals("Error code should be CONNECTION_CLOSING(80001)", 80001, detachWaiter1.error.code);

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