Merge pull request #3705 from reubenmiller/test-improve-log-assertion

tests: improve log assertion by filtering logs by time

Author: reubenmiller

tests/RobotFramework/tests/mqtt/disconnect_from_broker.robot

@@ -14,8 +14,9 @@ Test Tags           theme:mqtt
 Publish Connection Closed after publish
     [Documentation]    Tests that the connection to the MQTT broker is closed after publishing.
     Execute Command    /setup/bootstrap.sh
+    ${log_start}    ThinEdgeIO.Get Unix Timestamp
     Execute Command    tedge mqtt pub test/topic Hello
-    ${MQTT_PUB}    Execute Command    journalctl -u mosquitto -n 30
+    ${MQTT_PUB}    Execute Command    journalctl -u mosquitto --since "@${log_start}" --no-pager
     Should Contain    ${MQTT_PUB}    Received DISCONNECT from tedge-pub
 
 Publish Connection Closed after publish and no error message with TLS
@@ -24,15 +25,17 @@ Publish Connection Closed after publish and no error message with TLS
     Set up broker with server and client authentication
     tedge configure MQTT server authentication
     tedge configure MQTT client authentication
+    ${log_start}    ThinEdgeIO.Get Unix Timestamp
     Execute Command    tedge mqtt pub test/topic Hello
-    ${MQTT_PUB}    Execute Command    journalctl -u mosquitto -n 30
+    ${MQTT_PUB}    Execute Command    journalctl -u mosquitto --since "@${log_start}" --no-pager
     Should Contain    ${MQTT_PUB}    Received DISCONNECT from tedge-pub
 
 Subscribe Connection Closed On Interruption
     [Documentation]    Tests that a subscribe connection to MQTT broker closes upon interruption.
     Execute Command    /setup/bootstrap.sh
+    ${log_start}    ThinEdgeIO.Get Unix Timestamp
     Execute Command    timeout 2 tedge mqtt sub test/topic    ignore_exit_code=True
-    ${MQTT_SUB}    Execute Command    journalctl -u mosquitto -n 30
+    ${MQTT_SUB}    Execute Command    journalctl -u mosquitto --since "@${log_start}" --no-pager
     Should Contain    ${MQTT_SUB}    Received DISCONNECT from tedge-sub
 
 Stop subscription on SIGINT even when broker is not available