What are the steps to identify the root cause of a functional testing failure?

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Functional testing is a type of software testing that verifies that the system or application performs as expected according to the user requirements and specifications. However, sometimes functional testing may fail due to various reasons, such as defects, errors, misconfigurations, or environmental issues. How can you identify the root cause of a functional testing failure and fix it quickly and effectively? Here are some steps you can follow to troubleshoot and resolve functional testing failures.

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Bryan Zevada

Software QA Automation Engineer

1 Analyze the failure

The first step is to analyze the failure and gather as much information as possible about it. You should review the test results, logs, screenshots, error messages, and any other relevant data that can help you understand what went wrong and where. You should also compare the actual and expected outcomes of the test case and identify the discrepancies. You should also check if the failure is consistent or intermittent, and if it affects other test cases or functionalities.

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Bryan Zevada

Software QA Automation Engineer
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From my experience, before ever analyzing the failure, I think it's important to identify and have a high-level understanding of the components and systems that make up your enterprise's framework. Understanding these beforehand will make it easily identifiable whether it is in the back end or front end. This is, of course, assuming you have a good idea of the monitoring controls within each component. From unit tests to automated functional tests, and the dependencies each one of these may currently have in place.

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Sourav Kuila

MBA | Lead Test Analyst at Oracle Cerner | Accenture | Siemens | Edusys | PRINCE2?| ISTQB? | HFMA CRCR? | ITIL Foundation?
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The root cause analysis is an important step in functional testing. To know the root cause there should be a meeting and consensus between the developers and stakeholders.

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2 Isolate the cause

The next step is to isolate the cause of the failure and narrow down the possible factors that may have contributed to it. You should eliminate any external or environmental factors that may have interfered with the test execution, such as network, hardware, software, or data issues. You should also verify that the test case, the test data, and the test environment are correct and consistent with the user requirements and specifications. You should also reproduce the failure in different scenarios and conditions to see if it persists or changes.

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Bryan Zevada

Software QA Automation Engineer
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Finding the cause, inherently it's important to view traces of the issues. Looking at the cause of the issue can start with determining if it's related to latency, timeouts, or exceptions. Logs will prove to be handy, but running a variety of tests is invaluable. The more data you have behind the executions, the better. These tests can range from simple functional API tests to trying API load tests. There's no one sure way to isolate or connect the dots. However, following proper testing procedures in all steps of the SDLC definitely helps speed up the process of getting to the root cause of any unexpected failure. Taking initiative and staying proactive in the projects helps prevent and better mitigate unexpected failures within projects.

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3 Identify the source

The third step is to identify the source of the failure and locate the specific component, module, or function that is responsible for it. You should use debugging tools, code analysis, breakpoints, or tracing techniques to examine the code and find the exact line or statement that causes the failure. You should also check if the failure is related to any dependencies, integrations, or interactions with other components or systems. You should also consult with the developers, testers, or other stakeholders who may have relevant knowledge or insights about the code or the functionality.

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4 Fix the issue

The fourth step is to fix the issue and resolve the failure. You should apply the appropriate solution, such as correcting the code, modifying the test case, updating the test data, or adjusting the test environment. You should also verify that the solution works and does not introduce any new errors or failures. You should also document the issue, the solution, and the results for future reference and learning.

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5 Re-test and confirm

The final step is to re-test and confirm that the failure is fixed and that the functionality works as expected. You should run the test case again and check if the actual outcome matches the expected outcome. You should also run other test cases or functionalities that may have been affected by the issue or the solution to ensure that there are no side effects or regressions. You should also report the results and update the test status and the defect status accordingly.

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6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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What are the steps to identify the root cause of a functional testing failure?

1

2

3

4

5

6

1 Analyze the failure

2 Isolate the cause

3 Identify the source

4 Fix the issue

5 Re-test and confirm

6 Here’s what else to consider

Functional Training

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What are the steps to identify the root cause of a functional testing failure?

1

2

3

4

5

6

1 Analyze the failure

2 Isolate the cause

3 Identify the source

4 Fix the issue

5 Re-test and confirm

6 Here’s what else to consider

Functional Training

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