Added test to check if many devices are registered

Signed-off-by: Marcel Guzik <[email protected]>

tests/RobotFramework/tests/cumulocity/availability/processes_many_devices.robot

@@ -0,0 +1,36 @@
+*** Settings ***
+Documentation       A separate suite for #3279, because a lot of devices need to be registered, doesn't connect to the
+...                 cloud. Attempt to register many devices and check that messages are still processed.
+
+Resource            ../../../resources/common.resource
+Library             Cumulocity
+Library             ThinEdgeIO
+
+Test Setup          Test Setup
+Test Teardown       Get Logs
+
+Test Tags           theme:c8y    theme:monitoring    \#3279
+
+
+*** Variables ***
+${NUM_ENTITIES}     ${100}
+
+
+*** Test Cases ***
+Processes many devices
+    Stop Service    tedge-mapper-c8y
+
+    Execute Command
+    ...    for i in $(seq 0 ${NUM_ENTITIES}); do tedge mqtt pub --retain "te/device/child$i//" '{"@type":"child-device"}'; done
+
+    Start Service    tedge-mapper-c8y
+
+    FOR    ${index}    IN RANGE    ${NUM_ENTITIES}
+        Should Have MQTT Messages    c8y/s/us    message_pattern=101,*child${index}
+    END
+
+
+*** Keywords ***
+Test Setup
+    ${DEVICE_SN}=    Setup    skip_bootstrap=True
+    Execute Command    ./bootstrap.sh