Generate Test Cases Skill

You will analyze code and generate a list of test cases that should be written for a given method/class.

IMPORTANT: This command should be run BEFORE /generate-tests to ensure test cases follow the rules.

Rules Reference

CRITICAL: You MUST read and apply all rules from the following files before generating test cases:

General Rules (Always Apply)

• ./rules/general/test-case-generation-strategy.md - INCLUDE/EXCLUDE criteria for test cases
• ./rules/general/naming-conventions.md - Test naming format
• ./rules/general/general-principles.md - Core testing principles
• ./rules/general/what-makes-good-test.md - Clarity, Completeness, Conciseness, Resilience
• ./rules/general/keep-tests-focused.md - One scenario per test
• ./rules/general/test-behaviors-not-methods.md - Separate tests for behaviors
• ./rules/general/prefer-public-apis.md - Test public APIs over private methods

Output Format

For each test case, provide:

## Test Cases for {ClassName}.{methodName}

### 1. {testMethodName}
- **Given:** {preconditions/input state}
- **When:** {action being tested}
- **Then:** {expected outcome}
- **Code branch:** {which code path this covers}

### 2. {testMethodName}
...

Naming Convention

Test method name format: {testedMethod}_{givenState}_{expectedOutcome}

Examples:

• calculateTotal_validProducts_returnsSum
• calculateTotal_emptyList_throwsIllegalArgumentException
• getUser_unauthorized_returns401
• getUser_forbidden_returns403

Instructions

When this command is invoked, generate test cases for the specified target:

Target to analyze: $ARGUMENTS

Steps:

1. Read the rules from ./rules/general/ directory
2. Read the source file/class/method specified above
3. Analyze ALL code branches, including:
   • Success paths
   • Error/exception paths
   • Validation logic
   • Private/protected methods called by the target
   • Security annotations (if present)
4. Apply the INCLUDE/EXCLUDE rules strictly
5. Output the list of test cases in the specified format
6. Do NOT generate actual test code - only the test case descriptions

After Generating Test Cases

If the original user request was "generate tests" (not just "generate test cases"):

• After outputting test cases, use the AskUserQuestion tool to ask for permission:

  Question: "Test cases are ready. Proceed with generating test code?"
  Header: "Next step"
  Options:
    - Label: "Yes, generate tests" / Description: "Proceed to run /generate-tests and create test files"
    - Label: "No, stop here" / Description: "Review test cases first, generate tests later manually"

• If user selects "Yes", invoke /generate-tests with the same target
• If user selects "No", STOP

If the original user request was only "generate test cases":

• After outputting test cases, add a helpful note at the end:

  "To generate actual test code from these test cases, run /generate-tests <target>"

• Do NOT use AskUserQuestion - just provide the hint as text