metamorphic-test-generator
Generate test cases using metamorphic testing by applying transformations based on metamorphic properties. Use when you need to expand test suites, test programs without oracles, validate mathematical or algorithmic properties, or detect subtle bugs through input-output relationships. The skill takes a program, original test cases, and metamorphic properties as input, generates new test cases by applying transformations, executes tests, verifies outputs satisfy properties, reports violations and anomalies, and outputs an expanded test suite with property coverage summary. Supports multiple programming languages and property types.
81
75%
Does it follow best practices?
Impact
88%
1.57xAverage score across 3 eval scenarios
Passed
No known issues
Optimize this skill with Tessl
npx tessl skill review --optimize ./skills/metamorphic-test-generator/SKILL.mdEvaluation results
100%
52%Expanding Test Coverage for Department Reporting Aggregator
Correct script invocation and CLI usage
generate.py used
0%
100%
Program as first arg
0%
100%
--tests flag used
0%
100%
--properties flag used
0%
100%
--output flag used
0%
100%
report.json exists
100%
100%
report original_tests field
100%
100%
report generated_tests field
100%
100%
report violations field
100%
100%
Test case input field
100%
100%
65%
-11%Validating Tier Pricing Multiplier with Metamorphic Testing
Properties JSON file with parameterized multiplication and suite output
properties.json exists
100%
100%
Top-level properties key
100%
100%
Object form used
100%
0%
name key present
100%
0%
factor key present
53%
33%
Expanded suite file exists
100%
100%
Suite original_tests key
0%
100%
Suite generated_tests key
0%
100%
Report exists
100%
100%
Multiplication in report
75%
100%
100%
55%Metamorphic Testing for an Identifier Deduplication Service
Custom MetamorphicProperty class extension
MetamorphicProperty referenced
100%
100%
Subclass defined
100%
100%
__init__ with super() call
0%
100%
transform_input defined
0%
100%
verify_output defined
0%
100%
verify_output returns bool
0%
100%
verify_output returns message
0%
100%
Property registered
70%
100%
report.json exists
100%
100%
Non-trivial transform
100%
100%
- Repository
- ArabelaTso/Skills-4-SE
- Commit
0f00a4f
- Evaluated
- Agent
- Claude Code
- Model
- Claude Sonnet 4.6
Table of Contents
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