Remediating Selenium WebDriver Mistakes Through Exception Management Framework – Selenium Guide #19
Errors in automation scripts are frequently seen. The word ‘Error’ basically describes a distinctive or extraordinary circumstance.
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The implementation of automation code may not always be successful due to various issues such as inconsistent network conditions, internet connectivity problems, server instability, and more. Sometimes we may receive errors due to a lack of sufficient waiting time or incorrect code syntax or parameters.
In the last tutorial, we discussed 3 main types of web elements, namely Web Tables, Frames, and Dynamic Elements and how to manage them using a Selenium script.
Before moving on to framework tutorial sessions in this Selenium training series, we will delve into the different types of errors and how to manage these in both Java and Selenium scripts. Developers and testers leverage an exception handling framework to deal with errors in Selenium scripts.
Contents Overview:
What Exactly is an Error?
Errors are situations that abruptly stop a Java program before delivering the expected outcome. Error handling capabilities are provided by Java for user convenience.
Error handling is the practice of dealing with errors.
The importance of handling errors is due to their ability to interrupt the normal execution flow of the program. One main objective of error handling is to minimize this disruption and facilitate the continuation of program execution. Certain actions might need to be performed when specific errors occur.
An error object is generated when an error happens, which is technically known as ‘Throwing an Error’. We typically append ‘Try/Catch’ blocks to address this, as shown below:
try { // Secure code } catch (ErrorType e) { // Catch element }
#1) Code that may potentially trigger an error is encompassed within the try section.
#2) The error is intercepted by the catch clause, which takes it as an argument.
#3) If no error is triggered, the try clause is executed, and the catch clause is bypassed.
An Illustration: If a Selenium script fails due to an incorrect locator, it’s important for the developer to comprehend the cause of the failure. This can be achieved by appropriately managing the error within the program.
In my experience, it’s best to try to steer clear of WebDriver errors whenever possible and reserve catching for genuinely unique scenarios. We should employ try/catch to manage unexpected errors outside of our control.
Eradicate the errors that can be caught; manage the rest!
This approach has proven effective for me.
For instance, imagine a test page that takes unusually long to load on a test server. We might frequently encounter errors while attempting actions on this page. Rather than just catching these errors each time, our response could be to:
- Add a wait command to try to circumvent errors
- Employ ‘try/catch’ to manage genuinely unusual occurrences when they happen
This method can decrease the frequency of error encounters.
Pros and Cons of the Prevent-Handle Method
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