java-regression-test-generator

Automatically generate regression tests for Java codebases by analyzing changes between old and new code versions. Use when users need to: (1) Generate tests after refactoring or code changes, (2) Ensure previously tested behavior still works in new versions, (3) Cover modified or newly added code paths, (4) Migrate existing tests to work with updated APIs or signatures, (5) Maintain test coverage during code evolution. Supports JUnit and TestNG frameworks with unit tests, parameterized tests, and exception testing patterns.

1.00x

Quality

86%

Does it follow best practices?

Impact

76%

1.00x

Average score across 3 eval scenarios

Securityby

Passed

No known issues

Evaluation results

90%

Math Utility Library: Version Upgrade Test Coverage

Algorithm optimization and error handling test migration

Criteria

Without context

With context

Preserves isPrime small numbers test

100%

Preserves isPrime composite test

100%

Preserves divide normal test

100%

Even number optimization coverage

100%

Large prime test

100%

assertThrows for divide by zero

100%

Exception message verified

100%

Performance test present

Negative/zero isPrime edge case

100%

JUnit 5 imports used

100%

Test method naming convention

100%

62%

-20%

Email Service Refactor: Generate Updated Regression Tests

Dependency injection refactor and new method coverage with Mockito

Criteria

Without context

With context

@ExtendWith(MockitoExtension.class)

100%

@Mock annotations used

100%

@InjectMocks used

send() success test migrated

100%

sendBatch normal case

100%

sendBatch empty list

100%

sendBatch partial failure

100%

logger.log() interaction verified

100%

@BeforeEach or annotation-based setup

100%

JUnit 5 imports used

100%

sendBatch null recipient handling

77%

21%

Pricing Service API Changes: Regression Test Update

Signature migration, return type adaptation, obsolete test removal, and parameterized tests

Criteria

Without context

With context

calculateTotal migrated with 10% rate

100%

@ParameterizedTest for calculateTotal

findProduct Optional.isPresent() check

100%

findProduct empty Optional check

100%

Optional-specific tests added

100%

generateLegacyReport test commented as OBSOLETE

33%

Migration comments in migrated tests

100%

calculateTotal zero tax rate

100%

JUnit 5 imports used

75%

62%

No calls to generateLegacyReport

100%

Test naming convention

100%

Repository: ArabelaTso/Skills-4-SE
Commit: 0f00a4f

Evaluated: 29 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Math Utility Library: Version Upgrade Test Coverage Email Service Refactor: Generate Updated Regression Tests Pricing Service API Changes: Regression Test Update

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