Exception/Error Handling using VB Script in QTP

Unexpected errors or events during test run which interrupt test are called Exceptions.

Exception/Error handling ways:

VB script error handling

o   Using Test Settings

o   Using On Error Statement

o   Using Err Object Properties

o   Using Exit Statement

·         Recovery Scenarios

Test settings: Error handling

Exception/Error handling can be defined in Test Settings through FileàSettingsàRun as shown below,

On Error Statement: Error handling

On error statement is used to handle the errors by the tester rather than allowing VB Script engine to display error messages.

On Error Resume Next:

Causes the execution to continue with next line of code when error is occurred.

On Error GoTo 0:

Disable error handling if you have previously enabled error handling using On Error Resume Next.

Err Object: Error Handling:

Err object contains information about run-time errors.

Err object is built in object with global scope.

Properties:

Number: Number is the default property of the Err Object and it contains numeric value specifying error.

If the value of Err. Number is 0, no error has occurred.

Description: Description property returns or sets a descriptive string associated with an error.

When the run-time error occurs, the properties of Err object are filled with information that uniquely identifies the error and information that can be used to handle it.

Methods:

Raise: To generate a run-time error in your code, use the Raise method.

Clear: The Clear method clears all property settings of the Err object.

 Using Exit Statement: Error Handling

Exit Statement can be used in conjunction with err object to exit from a test/action/iteration in case of an error encountered. Following are the exit statements that can be used in QTP to exit from a particular state:

ExitTest: Exits the entire QTP test or Quality Center business process test, regardless of the run-time iteration settings.

ExitAction: Exits the current action.

ExitActionIteration: Exits the current iteration of the action.  

ExitTestIteration:  Exits the current iteration of the QTP test or Quality Center business process test and proceeds to the next iteration.