Manual vs Automation Testing

Manual testing and automation testing are not competing approaches. They are complementary and can be used together depending on the testing objective, application, and situation.

Manual testing involves a tester performing the testing activities directly, while automation testing uses scripts and tools to execute predefined tests. The right approach depends on what needs to be tested, how often it needs to be tested, and whether the test is suitable for automation.

Manual Testing vs Automation Testing

1. Test Execution

• Manual Testing: A tester performs the test steps manually.

• Automation Testing: A script or automation tool performs the test steps.

2. Human Involvement

• Manual Testing: Requires direct human interaction during test execution.

• Automation Testing: Requires less human interaction once the automated test is set up and running.

3. Best Use Cases

• Manual Testing: Useful for exploratory testing, usability testing, visual checks, and scenarios that require human judgment.

• Automation Testing: Useful for repetitive, predictable, and frequently executed tests.

4. Repeated Testing

• Manual Testing: Repeating the same tests can require significant manual effort.

• Automation Testing: The same automated tests can be executed repeatedly with less manual effort.

5. Initial Effort

• Manual Testing: Usually requires less technical setup to begin testing.

• Automation Testing: Requires time to design, develop, configure, and maintain automation scripts.

6. Test Maintenance

• Manual Testing: Test cases may need to be updated when requirements or functionality change.

• Automation Testing: Both test cases and automation scripts may need to be updated when the application changes.

7. Speed

• Manual Testing: Execution speed depends on the tester.

• Automation Testing: Automated tests can execute repetitive checks quickly.

8. Human Judgment

• Manual Testing: A tester can observe unexpected behavior and make decisions during testing.

• Automation Testing: The automation generally checks the conditions and results that have been programmed into it.

Example

Consider an e-commerce checkout feature.

A tester may manually explore the checkout process to check whether the interface is understandable, whether the messages are clear, and whether unexpected user actions cause problems.

At the same time, an automated test can repeatedly verify that a user can add a product to the cart, enter valid information, and complete checkout after every new build.

Using both approaches can provide broader testing coverage than relying entirely on one.