tests: Make stream assertions robust to chunk splitting

When tty=True the output can be split across multiple stream chunks
instead of aligning on line boundaries, making exact chunk membership
checks unreliable.

Verify that the expected messages are present in the combined stream
output rather than at specific chunk boundaries.

Signed-off-by: Ricardo Branco <rbranco@suse.de>

Author: ricardobranco777

tests/integration/api_exec_test.py

@@ -286,13 +286,9 @@ def test_exec_command_tty_stream_no_demux(self):
         # tty=True, stream=True, demux=False
         res = self.client.exec_create(self.container, self.cmd, tty=True)
         exec_log = list(self.client.exec_start(res, stream=True))
-        assert b'hello out\r\n' in exec_log
-        if len(exec_log) == 2:
-            assert b'hello err\r\n' in exec_log
-        else:
-            assert len(exec_log) == 3
-            assert b'hello err' in exec_log
-            assert b'\r\n' in exec_log
+        merged = b''.join(chunk for chunk in exec_log)
+        assert b'hello out\r\n' in merged
+        assert b'hello err\r\n' in merged
 
     def test_exec_command_tty_no_stream_demux(self):
         # tty=True, stream=False, demux=True
@@ -304,10 +300,6 @@ def test_exec_command_tty_stream_demux(self):
         # tty=True, stream=True, demux=True
         res = self.client.exec_create(self.container, self.cmd, tty=True)
         exec_log = list(self.client.exec_start(res, demux=True, stream=True))
-        assert (b'hello out\r\n', None) in exec_log
-        if len(exec_log) == 2:
-            assert (b'hello err\r\n', None) in exec_log
-        else:
-            assert len(exec_log) == 3
-            assert (b'hello err', None) in exec_log
-            assert (b'\r\n', None) in exec_log
+        merged = b''.join(chunk for chunk, _ in exec_log)
+        assert b'hello out\r\n' in merged
+        assert b'hello err\r\n' in merged