Error Handling in QTP

Error and Exception Handling

Unexpected events, errors, and application crashes during a run session can disrupt the run session and distort results. This is a problem particularly when tests run unattended—the test pauses until one performs the operation needed to recover. To handle such situations, Error and Exception Handling is must while developing script or Automation Framework.

Error and Exception handling can be done by the following ways-

1- Conditional Statement 

2- On Error statement

3- Recovery Scenarios

Error Handling-

Low-level errors in the automation framework are handled using the Error Handling

There are 2 types of Error Handling:-

1-Conditional Statements: Conditionally executes a group of statements, depending on the Run-time QTP error received.

For e.g.- 

2 On error Statements- This causes execution to continue with the statement immediately following the statement that caused the run-time error, or with the statement immediately following the most recent call out of the procedure containing the On Error Resume Next statement. This allows execution to continue despite a run-time error.

Following are error statements: 

1. On Error Resume Next

2. On Error Go to 0

3. err.number

4. err.description

On Error Resume Next: On Error Resume Next statement enables the Error handling in the code. If there is error in the code "On error Resume Next" ignores it and continues with next line of code.

On Error Go to 0: On error got to 0 statement disables error handling we have previously enabled it by using On Error resume Next.

err.number and err.description: Provides the error number and the description of the error.

For e.g.-

 

Exception Handling

Recovery Scenario:

When executing scripts we may get some unexpected errors. To recover the test and continue running script from these unexpected errors we use Recovery Scenarios.

A recovery scenario consists of the following:

Trigger Event: The event that interrupts your run session. For example a window that may pop up on screen.

Recovery Operations: The operations to perform to enable QTP to continue running the test after the trigger event interrupts the run session. For example, clicking an OK button in a pop-up window.

Post-Recovery Test Run Option: The instructions on how QTP should proceed after the recovery operations have been performed, and from which point in the test QTP should continue. For example, you may want to restart a test from the beginning, or skip a step entirely and continue with the next step in the test. Recovery scenarios are saved in recovery scenario files having the extension .qrs. A recovery scenario file is a logical collection of recovery scenarios, grouped according to our specific requirements.

Examples of Recovery scenarios -

1-‘Object Not Found’ Run Time Error

Trigger Event: QTP does not locate an object in the application. 

Recovery Operation: QTP invokes Recovery Scenario ‘objectNotFound’.

Post-Recovery Operation: Recovery Scenario tries to locate for the object till the ‘Time Out’ time specified at the Global Library.

a. If the object is located within the Time Out time, QTP performs the current step and execution resumes.

b. If the object is not found within the Time Out time, QTP Exits the Test with Snapshot of the application.

2- 'Any Error' Run Time Error

Trigger Event: Any run-time QTP error besides 'Cannot find the Object....'

Recovery Operation: QTP invokes the Recovery Scenario ‘anyError’.

Post Recovery Operation: QTP exits the current test with the snapshot of the application.

Steps for Creating a Recovery Scenario-

1-Select “Recovery Scenario Manager” from Resources menu-

2-Click on ‘New’ button-

3-Click on “Next” button-

4-Select the “Trigger Event” and then click on Next button

5-In Case of “Trigger Event” as “Pop-up window”, select the window using Hand and then click on Next button- 

6-Select the “Recovery” operation and click on Next button

  

7-In Case of “Recovery” operation as “Keyboard or mouse operation” select the operation and click on Next button-

8-Select the “Post Recovery” options and click on Next button