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List of Best Functional Regression Testing Service Providers

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Regression Testing vs. Unit Testing: Key Differences

FeatureRegression TestingUnit Testing
DefinitionVerifies that existing functionalities haven't broken due to code changes or new features.Tests individual units of code (functions, modules) in isolation to ensure they work as expected.
FocusSystem behavior after changes, preventing regressions.Individual code units and their correctness.
TimingPerformed after any significant code change (bug fix, new feature) before deployment.Usually conducted early in the development cycle, after code is written.
Test casesDesigned to cover existing functionalities that changes might impact.Focused on specific code units and their expected outputs for various inputs.
Tools usedAutomated testing frameworks and regression testing tools.Automated testing frameworks, mocking frameworks.
OutcomeIdentifies regressions caused by changes and ensures existing functionality remains intact.Determines if individual code units function as expected, catching bugs early in development.
ExampleTesting if a new login feature affects existing user functionalities like profile management.Testing if a function calculating shipping costs produces the correct output for different addresses and weights.
FrequencyConducted regularly, especially after code changes, updates, or system enhancements, to detect regressions.Typically performed whenever a unit of code is written or modified to ensure the correctness of the code.
DependenciesDependent on the accuracy and completeness of the regression test suite to provide reliable results.Dependent on the correctness and effectiveness of the unit test cases to ensure proper functioning of the code.