[VOL-2418]: Disable and Delete the logical device

Change-Id: Ic670f374a1b05c5c2e3778a6f365952395623942
diff --git a/tests/functional/Voltha_ErrorScenarios.robot b/tests/functional/Voltha_ErrorScenarios.robot
index 09db958..abd49ae 100644
--- a/tests/functional/Voltha_ErrorScenarios.robot
+++ b/tests/functional/Voltha_ErrorScenarios.robot
@@ -168,3 +168,38 @@
 	...    ${src['onu']}    onu=True    onu_reason=omci-flows-pushed
     END
     Run Keyword and Ignore Error   Collect Logs
+
+Disable and Delete the logical device directly
+    [Documentation]    Disable and delete the logical device directly is not possible
+    ...    since it is allowed only through OLT device deletion.
+    [Tags]    VOL-2418     DisableDelete_LogicalDevice    notready
+    [Setup]   Delete Device and Verify
+    [Teardown]    None
+    Run Keyword If    ${has_dataplane}    Sleep    180s
+    #create/preprovision OLT device
+    ${olt_device_id}=    Create Device    ${olt_ip}    ${OLT_PORT}
+    Set Suite Variable    ${olt_device_id}
+    #validate olt states
+    Wait Until Keyword Succeeds    ${timeout}    5s    Validate OLT Device    PREPROVISIONED    UNKNOWN    UNKNOWN
+    ...    ${EMPTY}    ${olt_device_id}
+    #Enable the created OLT device
+    Enable Device    ${olt_device_id}
+    Wait Until Keyword Succeeds    ${timeout}    5s    Validate OLT Device    ENABLED    ACTIVE    REACHABLE
+    ...    ${olt_serial_number}
+    #Check whether logical devices are also created
+    ${rc}    ${output}=    Run and Return Rc and Output
+    ...    ${VOLTCTL_CONFIG}; voltctl logicaldevice list
+    Should Be Equal As Integers    ${rc}    0
+    Log    ${output}
+    ${logical_id}=    Get Logical Device ID From SN    ${olt_serial_number}
+    Should Not Be Empty    ${logical_id}
+    ${rc}    ${output}=    Run and Return Rc and Output
+    ...    ${VOLTCTL_CONFIG}; voltctl logicaldevice disable ${logical_id}
+    Should Be Equal As Integers    ${rc}    0
+    Log    ${output}
+    Should Contain     '${output}'     Unknown command
+    ${rc}    ${output1}=    Run and Return Rc and Output
+    ...    ${VOLTCTL_CONFIG}; voltctl logicaldevice delete ${logical_id}
+    Should Be Equal As Integers    ${rc}    0
+    Log    ${output1}
+    Should Contain     '${output1}'     Unknown command