Manual testing remains a crucial part of app and software development, especially when it comes to identifying real-world usability issues, edge-case bugs, and workflow inconsistencies that automated scripts might miss.
In this guide, I explain manual testing in detail and help you understand:
- When to perform manual testing
- The difference between manual and automation testing
- Top tools to perform manual testing
What is Manual Testing?
Manual testing is the process of evaluating software by executing test cases manually without using automation tools.
In this approach, testers act as end users to interact with the application, validate its functionality, verify that features work as expected, and identify any defects, inconsistencies, or usability issues that automation testing might miss.
When to Choose Manual Testing
Manual testing is a crucial part of the software development process, especially in scenarios where human intuition, real-world validation, and flexibility are needed. Here are some situations where manual testing is the preferred choice:
- Exploratory Testing and more: Manual testing is essential in exploratory testing when you need to explore the app, experiment with its functionality, and discover potential issues that automated scripts might not cover.
- Short-Term Projects: For projects with a limited scope or timeline, where setting up automation tools may not be time-efficient.
- User Interface (UI) and User Experience (UX) Testing: When assessing the user experience, visual design, and interactions on different devices, manual testing allows testers to better mimic real-world usage.
- Ad-hoc Testing: When you need to perform unplanned tests or test features that may change frequently.
- Complex Scenarios: When testing complex workflows, like multi-step forms or user journeys, where human intuition and judgment are required to spot subtle issues.
- Initial Stages of Development: During early development phases when automated tests may not yet be written, and manual tests are needed to validate basic functionality.
- Regression Testing for Small Changes: For quick verification of small bug fixes or changes, manual testing can be faster than writing or running automated scripts.
- Unstable Environments: When the application or environment is unstable and automation might fail, manual testing can be more flexible to adapt and identify issues dynamically.
Types of Manual Testing: Black Box, White Box, and Grey Box
Manual testing can also be categorized based on the tester’s knowledge of the internal workings of the application. Here’s a breakdown of the three main types:
- Black Box Testing: In black box testing, the tester focuses on testing the application’s functionality without any knowledge of the internal code or structure. The tester inputs data and checks whether the software behaves as expected, based solely on its outputs. It’s primarily used for functional, usability, and acceptance testing.
- White Box Testing: Also known as clear-box or glass-box testing, this method involves testing the internal logic and structure of the application. Testers need knowledge of the code and its design to create test cases. White box testing is used to check the application’s internal functioning, such as code coverage, paths, and logic.
- Grey Box Testing: Grey box testing is a combination of black box and white box testing. Testers have partial knowledge of the internal workings of the application but still focus on testing from an end-user perspective. This approach is ideal for finding issues related to both functionality and security.
Manual Testing Process
Here’s how to perform manual testing step by step:
- Requirement Analysis: Before starting the tests, testers need to thoroughly review the software’s requirements to understand its functionalities, features, and performance criteria. This helps in identifying key areas that require testing.
- Test Plan Creation: A test plan outlines the approach for testing, including the scope, objectives, resources, schedule, and test deliverables. It ensures that the testing process is structured and efficient.
- Test Case Design: Testers create detailed test cases based on the requirements. These test cases describe the inputs, actions, expected outcomes, and conditions for testing specific features of the application.
- Test Environment Setup: Testers prepare the necessary hardware, software, and network environments where the testing will take place. This includes configuring browsers, operating systems, and devices for compatibility testing.
- Test Execution: Testers execute the test cases manually by interacting with the application, entering inputs, and verifying outputs. During this step, testers check if the application behaves as expected and whether any issues arise.
- Defect Reporting: If any issues or defects are found during test execution, they are reported in a bug tracking tool. Each defect is documented with clear steps to reproduce, severity, and any other relevant information.
- Retesting: After the defects are fixed, testers retest the application to ensure that the issues have been resolved and that no new problems have been introduced.
- Regression Testing: In cases where new features or fixes have been added, regression testing is performed to ensure that the changes haven’t caused any unintended side effects in the existing functionality.
- Test Closure: Once all tests are completed, the testing process is closed. Testers document the results, including any remaining defects, and provide a final report that summarizes the testing activities and outcomes.
Manual Testing Tools
Some of the popular Manual testing tools are the following:
| Tool Name | Best For Use Case | Key Features | Free or Paid |
|---|---|---|---|
| BrowserStack Live | Manual website testing on real browsers and devices | Real desktop and mobile browsers, cross-browser testing, responsive testing, local testing, screenshots, session debugging | Paid, with free trial |
| BrowserStack App Live | Manual mobile app testing on real Android and iOS devices | Real device access, app upload and install, gesture testing, network simulation, device logs, screenshots, video recording | Paid, with free trial |
| TestRail | Managing manual test cases and test runs | Test case repository, test plans, test runs, execution status, reporting, integrations with issue trackers | Paid, with free trial |
| Jira | Defect tracking and manual testing workflow management | Bug tracking, sprint boards, issue assignment, workflow customization, reporting, integrations with test management tools | Paid, with free plan and free trial |
| Zephyr | Test case management inside Jira | Test planning, test execution, traceability, reporting, Jira-native test workflows | Paid, with free trial |
| qTest | Managing enterprise manual testing cycles | Test case management, test execution tracking, release coverage, defect integration, collaboration dashboards | Paid, with free trial |
| Bugzilla | Tracking and managing defects in manual testing | Bug reporting, issue assignment, status tracking, searchable bug history, comments, attachments | Free and open source |
Why perform Manual Testing on Real Devices?
Performing manual testing on real devices is crucial for ensuring that your app provides an authentic, real-world user experience.
While emulators and simulators can mimic some aspects of a device, they often fail to replicate the true behavior, performance, and limitations of real devices.
Here are some reasons why manual testing on real devices is essential:
- Accurate Performance Testing: Real devices provide accurate performance insights, including response time, app loading speed, and overall responsiveness under varying conditions (network, memory, etc.).
- True Hardware Interaction: Real devices allow testers to check interactions with hardware components like the camera, GPS, accelerometer, and fingerprint sensors, ensuring proper functionality.
- UI/UX Validation: Testing on actual devices ensures that the app’s design adapts well to different screen sizes, resolutions, and orientations, providing a better user experience.
- Real Network Conditions: Real devices simulate actual network conditions, helping you identify connectivity issues, signal loss, or poor performance when switching between Wi-Fi and mobile data.
- Battery and Resource Management: Testing on physical devices helps assess battery consumption and the app’s resource usage, which can differ from emulator-based tests.
- Real-World Scenarios: Manual testing on real devices accounts for factors such as device fragmentation, OS version differences, and user behavior that emulators can’t fully simulate.
Manual testing on real devices is vital for ensuring that the app functions as expected across a wide range of real-world conditions and provides a flawless user experience.
Advantages and Disadvantages of Manual Testing
| Advantages | Disadvantages |
|---|---|
| Human Intuition: Testers can identify issues that automated scripts might miss, especially in complex or dynamic situations. | Time-Consuming: Manual testing requires a lot of time, especially for large-scale or repetitive tests. |
| Flexible: Manual testing is adaptable and can easily handle unexpected changes in the app or test case. | Prone to Human Error: Mistakes can happen due to fatigue or oversight, leading to inaccurate results. |
| Real-World Testing: Provides insights into user experience, UI/UX issues, and usability from a real user perspective. | Limited Test Coverage: The number of tests that can be conducted is limited compared to automated testing. |
| No Setup Cost: It doesn’t require any initial investment in test automation tools or infrastructure. | Scalability Issues: As the app grows, manual testing becomes harder to scale without significantly increasing time and resources. |
| Exploratory Testing: Ideal for ad-hoc, exploratory, or unstructured testing, where human insight is crucial. | Repetitive Tasks: Manual testing is not efficient for repetitive tasks, such as regression testing, which is better suited for automation. |
| Good for Small Projects: Perfect for small projects with limited features or a short testing cycle. | High Long-Term Costs: Over time, manual testing can be more costly due to the need for dedicated resources. |
| Useful for Complex Features: Effective for testing complex features like user interactions, UI behavior, and other non-automatable scenarios. | Resource Intensive: Requires a dedicated testing team to carry out manual tests, which can lead to increased labor costs. |
Manual vs Automation Testing
Both manual and automation testing play essential roles in the software development process, each with its own strengths and best-use scenarios. While manual testing is ideal for scenarios requiring human judgment and flexibility, automation testing excels in repetitive tasks, large-scale tests, and long-term efficiency.
Here’s a comparison to help you choose the right approach based on your needs.
| Aspect | Manual Testing | Automation Testing |
|---|---|---|
| Purpose | Ideal for small-scale, exploratory, or complex test cases. | Best for repetitive, regression, and performance testing. |
| Speed | Slower as tests are executed by a human tester. | Faster, especially for repetitive tasks and large-scale testing. |
| Cost | Typically lower initial cost but can be expensive in the long run due to the need for manual effort. | Higher initial setup cost but cost-effective in the long term due to reduced human intervention. |
| Accuracy | Prone to human error, especially with repetitive testing. | High accuracy, as automated scripts run without human intervention. |
| Test Coverage | Limited to a small number of tests due to manual execution time. | Can cover a large number of test cases across multiple environments in a short time. |
| Flexibility | Highly flexible, great for ad-hoc and exploratory testing. | Less flexible, suited for predefined test cases and scripts. |
| Execution Frequency | Suitable for one-time or infrequent testing. | Best for continuous testing or testing over multiple iterations. |
| Complexity | Effective for complex user interactions and UI/UX testing. | Best for straightforward, repetitive tests such as regression or performance testing. |
| Feedback Time | Immediate feedback during testing. | Immediate feedback, but depends on script execution. |
| Maintenance | Low maintenance as there are no scripts to update. | Requires maintenance of scripts whenever the application changes. |
| Use Cases | Exploratory testing, usability testing, user interface (UI) testing, ad-hoc testing, and acceptance testing. | Regression testing, performance testing, load testing, and smoke testing. |
Both manual and automation testing have their strengths and are often used together in a comprehensive testing strategy to ensure software quality.
Conclusion
Manual testing remains an essential aspect of the software development lifecycle, offering valuable insights into user experience, usability, and real-world app behavior that automation might miss.
While it can be time-consuming and resource-intensive, manual testing is particularly effective for exploratory testing, UI/UX validation, and scenarios that require human intuition and flexibility.
By understanding when and how to apply manual testing, you can ensure that your app delivers a seamless experience to users. Combining manual testing with automated tests in a balanced approach will help achieve comprehensive quality assurance and a robust, reliable application.
