Buddy testing: how developers and testers find bugs together

Most bugs are not caused by missing test cases.

They happen because assumptions are wrong, functionality behaves differently in real environments, or communication gaps appear between the development team and the testing team.

This is where buddy testing becomes useful.

Instead of separating development and testing completely, buddy testing brings two individuals together, usually one developer and one tester, to validate functionality collaboratively before the software moves deeper into the software development lifecycle.

The process is simple:

• one team member drives the software application
• the buddy tester observes, asks questions, and suggests additional test scenarios
• both team members work together to identify defects and validate expected results in real time

This article explains what buddy testing is, how it works in practice, where it fits into the testing process, and why many teams use it to improve quality, increase efficiency, and build stronger collaboration between testers and developers.

What is buddy testing

Simple definition

Buddy testing is a software testing technique where two team members work together to test a software application.

Usually, one person is a tester and the other is a developer or subject matter expert. They work on the same machine, explore functionality together, and identify defects before the software moves further into the testing process.

Unlike approaches that rely only on structured test cases, buddy testing focuses on collaboration, practical validation, and real-time feedback.

Technical definition

Buddy testing refers to a collaborative manual testing technique performed by two individuals, typically from the testing team and development team, working together to validate software functionality.

In most cases:

• the primary tester performs the test scenarios
• the buddy tester observes system behavior, reviews expected results, and suggests additional test cases or edge cases

The technique combines exploratory testing, functional flow validation, and quick knowledge sharing to improve overall quality during the software development lifecycle.

Buddy testing is especially useful for:

• testing complex workflows
• validating functionality with unclear or incomplete proper specification
• identifying bugs early before larger regression or automation testing cycles

Unlike automation testing or highly structured QA approaches, buddy testing depends heavily on communication, domain knowledge, practical expertise, and collaboration between team members.

Where buddy testing fits in the testing process

Buddy testing fits between development and formal QA validation within the testing process.

Teams usually perform buddy testing:

• after a developer finishes functionality
• before the feature reaches the larger testing team
• before regression testing or release validation begins

It is commonly used:

• during manual testing sessions
• for exploratory testing of new features
• when testing complex systems or specific areas of functionality
• when proper specification confuses the testing process or leaves gaps in expected behavior

Buddy testing also supports:

• enhanced collaboration between testers and developers
• quick knowledge transfer to a new tester or team member
• increased confidence before functionality moves into larger testing cycles

In practice, buddy testing complements structured test cases, automation testing, and formal testing plans rather than replacing them.

How buddy testing works step by step

Buddy testing works best when it has enough structure to stay useful, but not so much structure that it becomes just another scripted testing session.

The goal is to bring two team members together, usually one from the development team and one from the testing team, to validate functionality, discuss expected results, and identify defects early.

Define the testing plan and goals

Start by defining what the buddy testing session should cover.

This does not need to be a full testing plan, but both people should know:

• which functionality is being tested
• which test scenarios matter most
• what expected results should look like
• which environment, data, and tools are needed

This keeps the session focused. Without a clear goal, buddy testing can turn into random clicking instead of useful validation.

Pair a developer and tester together

Buddy testing usually works best when a developer pairs with an experienced tester.

The developer brings knowledge of the code, implementation details, and technical constraints. The tester brings testing skills, domain knowledge, and a stronger sense of where bugs usually hide.

This combination is useful because both people see the software from different angles. The developer understands how the functionality was built. The tester understands how it might fail.

Execute test scenarios collaboratively

During the session, one person usually drives while the other observes.

In many cases, the primary tester performs the actions while the buddy tester observes behavior, asks questions, and suggests additional checks.

The team can go through specific test cases first, especially if there are structured test cases linked to the feature. This helps confirm that the basic functional flow works as expected before moving into less predictable areas.

Explore beyond structured test cases

Buddy testing becomes most useful when the pair goes beyond only structured test cases.

Once the main test scenarios are covered, both team members can explore:

• edge cases
• unusual user inputs
• unclear specification areas
• workflows that combine multiple features

This is where many defects are found. A proper specification can still miss real user behavior, and buddy testing gives the team space to challenge assumptions while the context is still fresh.

Review findings and identify defects together

At the end of the session, review what was found.

Document:

• confirmed bugs
• unclear expected results
• questions for the product owner or subject matter expert
• areas that need more testing

Because both the developer and tester saw the issue together, there is usually less back-and-forth later. The defect is easier to explain, reproduce, and fix.

Buddy testing vs pair testing

Buddy testing and pair testing are closely related, but they are not exactly the same. Both involve two people testing together, but the setup and purpose are slightly different.

What buddy testing focuses on

Buddy testing usually focuses on collaboration between different roles.

A tester might work with a developer, product specialist, subject matter expert, or new tester to validate a specific feature or functional flow.

The goal is practical: identify defects, clarify expected behavior, share knowledge, and improve confidence before the software moves further through the testing process.

What pair testing focuses on

Pair testing usually involves two testers working together.

One tester performs the actions while the other observes, questions, documents, or suggests new test ideas. The goal is often to improve test coverage, strengthen testing skills, and explore software behavior more deeply.

Pair testing can be especially helpful for training, onboarding a new tester, or working through testing complex systems where two perspectives are better than one.

Key differences between the two techniques

Buddy testing often brings together people from different roles, usually from the development team and testing team. Pair testing usually happens between two testers.

Buddy testing is often used to validate functionality quickly and improve collaboration around a feature. Pair testing is more focused on testing depth, shared technique, and tester-to-tester learning.

Both methods are useful. The better choice depends on what the team needs: faster cross-team feedback, or deeper testing collaboration between testers.

Key benefits of buddy testing

Buddy testing is popular because it combines technical knowledge, testing expertise, and real-time collaboration. Instead of working in isolation, team members work together to validate functionality, identify defects, and improve software quality before a feature reaches larger testing cycles.

Improved collaboration between testers and developers

One of the biggest benefits of buddy testing is enhanced collaboration between the testing team and the development team.

In many software development environments, testers and developers work on the same functionality but from different perspectives. Buddy testing brings those perspectives together.

The developer understands how the code was implemented and why certain decisions were made. The tester understands how users interact with the software application and where bugs are most likely to appear.

This collaboration helps eliminate misunderstandings, creates stronger communication between teams, and improves the overall testing process.

Faster identification of bugs and functionality issues

Buddy testing often helps teams identify defects earlier than traditional testing approaches.

Because two individuals are reviewing the same functionality together, issues become easier to spot. While the primary tester performs actions, the buddy tester observes behavior, questions assumptions, and suggests additional test scenarios.

This combination frequently uncovers:

• bugs in the functional flow
• missing validation
• incorrect expected results
• edge cases that were not considered during development

Finding issues earlier reduces rework and supports improved quality throughout the software development lifecycle.

Quick knowledge sharing across the team

Buddy testing is one of the fastest ways to transfer knowledge between team members.

An experienced tester can share testing skills, domain expertise, and practical testing techniques. A developer can explain system behavior, architecture decisions, and implementation details.

This makes buddy testing particularly helpful for:

• onboarding a new tester
• introducing team members to new functionality
• sharing knowledge about specific areas of the software
• building stronger understanding across the team

The result is quicker learning and increased confidence when working on future releases.

Increased efficiency during manual testing

Manual testing can sometimes become repetitive or overly focused on predefined test cases.

Buddy testing increases efficiency by allowing two people to validate functionality at the same time. Instead of waiting for bugs to be reported later, developers and testers can discuss issues immediately and validate assumptions together.

This often leads to:

• fewer testing cycles
• faster feedback
• quicker bug reproduction
• more efficient validation of functionality

The collaborative approach helps teams move through testing faster while still maintaining quality.

Better confidence in expected results and releases

Buddy testing helps create alignment around what the software should do.

When developers and testers review functionality together, they build a shared understanding of:

• expected results
• business requirements
• user behavior
• release readiness

This reduces uncertainty and improves confidence before the software moves into broader testing, regression testing, or production environments.

Ultimately, buddy testing helps teams release software with greater confidence because functionality has already been validated from multiple perspectives.

Limitations and challenges of buddy testing

While buddy testing provides significant benefits, it is not suitable for every situation. Like any testing technique, it has limitations that teams should understand before making it a regular part of their process.

Requires strong communication between team members

Buddy testing depends heavily on communication.

If the primary tester and buddy tester do not communicate effectively, the session can quickly lose value. Team members need to ask questions, challenge assumptions, and discuss findings openly.

Without strong collaboration, buddy testing becomes little more than two people watching the same screen.

The technique works best when both individuals are comfortable sharing expertise and providing feedback.

Can become inefficient without a testing plan

Buddy testing is intentionally flexible, but it still needs direction.

Without a basic testing plan, teams can spend time exploring functionality without clear goals or priorities. This can reduce efficiency and make sessions less productive.

A simple plan should define:

• the functionality being tested
• the key test scenarios
• expected outcomes
• areas that require additional attention

Having structure keeps the session focused while still allowing exploratory testing.

Depends heavily on expertise and domain knowledge

The effectiveness of buddy testing often depends on who participates.

A buddy tester with strong domain knowledge can uncover issues quickly. A subject matter expert can provide valuable context about functionality and business requirements.

Without sufficient expertise, important defects may be missed and discussions may remain superficial.

For this reason, selecting the right team members is an important part of the process.

Difficult to scale across large testing teams

Buddy testing works well for small groups, but it becomes harder to scale as organizations grow.

Large testing teams often need:

• structured test cases
• formal testing plans
• automation testing
• repeatable testing processes

Because buddy testing requires two people to focus on the same activity at the same time, it can be resource-intensive when applied across many teams or projects.

Most organizations use it selectively rather than making it their primary testing approach.

Not a replacement for automation testing

Buddy testing is valuable, but it cannot replace automation testing.

Automation testing remains essential for:

• regression testing
• repetitive validation
• large test suites
• continuous integration environments

Buddy testing is best viewed as a complementary technique. It helps uncover issues through collaboration and exploratory validation, while automation handles repeatable testing at scale.

The strongest quality strategies combine buddy testing, manual testing, and automation testing together.

What buddy testing changes for software teams

Buddy testing changes how developers and testers work together during the development process.

Instead of treating testing as a separate activity that happens after development, it encourages collaboration much earlier in the software development lifecycle.

More collaboration between development and testing teams

Buddy testing naturally breaks down barriers between the development team and testing team.

Developers gain visibility into how testers approach functionality. Testers gain access to technical knowledge that may not be available through documentation alone.

This creates stronger collaboration and improves communication throughout the development process.

More focus on practical validation instead of only structured test cases

Structured test cases remain important, but buddy testing encourages teams to go beyond them.

Rather than validating only predefined scenarios, team members explore:

• unusual workflows
• unexpected user behavior
• integration points
• areas where the proper specification may be incomplete

This practical approach often uncovers issues that formal test cases miss.

Faster feedback during the development process

Buddy testing shortens feedback loops.

Instead of waiting for bugs to move through reporting, triage, and reproduction stages, developers and testers can discuss issues immediately.

This leads to:

• quicker bug resolution
• fewer misunderstandings
• faster validation of fixes
• increased efficiency during testing

Better understanding of software functionality across teams

As team members work together, they develop a stronger understanding of the software application.

Developers learn more about testing techniques and user behavior. Testers gain insight into systems, functionality, and technical constraints.

This shared knowledge improves collaboration long after the buddy testing session ends.

Increased support for new testers and knowledge transfer

Buddy testing is particularly effective for training and onboarding.

A new tester can learn quickly by working alongside an experienced tester, developer, or subject matter expert.

The technique provides:

• quick knowledge transfer
• practical training
• exposure to real testing scenarios
• stronger confidence in the testing environment

This makes buddy testing a valuable tool for developing testing skills across the team.

Where buddy testing works best

Buddy testing is most effective when communication, collaboration, and rapid feedback provide more value than highly structured testing approaches.

Testing complex workflows and functional flows

Complex functionality often involves multiple systems, dependencies, and business rules.

Buddy testing helps teams validate these functional flows together and identify defects that may not be visible through individual testing.

New features and unstable functionality

New functionality is often where assumptions break down.

By testing together immediately after development, teams can uncover issues before they become larger problems later in the testing process.

Areas with unclear or incomplete specifications

Sometimes a proper specification does not exist or leaves important questions unanswered.

Buddy testing allows developers and testers to discuss expected behavior in real time and validate functionality collaboratively.

Exploratory testing and edge cases

Buddy testing naturally supports exploratory testing.

Two testers or a tester and developer can explore many different ways users might interact with the software and investigate edge cases beyond specific test cases.

Small teams and fast-moving environments

Small teams often benefit the most from buddy testing.

When resources are limited and development moves quickly, direct collaboration can be more efficient than formal handoffs between team members.

How to perform buddy testing effectively

The success of buddy testing depends on preparation, communication, and choosing the right people.

Choose the right buddy tester and primary tester

The strongest sessions typically pair complementary skills.

For example:

• developer + experienced tester
• new tester + experienced tester
• tester + subject matter expert

Different perspectives create better coverage and stronger discussions.

Define clear goals before testing starts

Before beginning, agree on:

• functionality to test
• test scenarios to cover
• expected results
• areas of concern

This creates focus and improves efficiency.

Use real-world test scenarios and environments

Whenever possible, validate functionality using realistic scenarios.

Testing that reflects actual user behavior often reveals issues that structured test cases miss.

Document bugs and expected results together

Capture findings during the session.

Document:

• identified defects
• unclear behavior
• expected outcomes
• follow-up actions

Shared documentation reduces confusion later and improves communication across the team.

Combine buddy testing with automation testing and formal QA processes

Buddy testing works best as part of a broader quality strategy.

Use it alongside:

• manual testing
• automation testing
• structured test cases
• regression testing
• formal testing plans

This combination provides both the flexibility of collaborative exploration and the consistency of repeatable testing processes.

Better software starts with better conversations

Buddy testing is one of the simplest testing techniques teams can adopt, but it often delivers outsized results.

By bringing together a developer and a tester, or two team members with different expertise, teams can identify defects earlier, validate functionality more thoroughly, and build a stronger understanding of how the software actually behaves.

The value of buddy testing is not just in finding bugs. It is in the conversations that happen while testing.

Developers gain insight into how testers think. Testers gain a deeper understanding of the systems they are validating. New team members learn faster. Complex functionality becomes easier to understand. And issues that might have slipped through structured test cases often surface before they become production problems.

That said, buddy testing is not a replacement for automation testing, regression testing, or a structured testing process. It works best as part of a broader quality strategy that combines collaboration, manual testing, and automated validation.

When used in the right situations, buddy testing helps teams improve quality, increase confidence in releases, and create stronger connections between development and testing.

If you'd like a practical overview of modern software testing techniques, from buddy testing and exploratory testing to automation and regression testing, check out our software testing cheatsheet.

It breaks down the methods, workflows, and testing practices that real teams use to build better software and catch bugs before users do.