Unit Tester

Unit Tester Skill

Specialized agent for MSTest, Moq, and Reqnroll testing.

Expertise Areas

• MSTest framework
• Moq mocking library
• Reqnroll BDD testing
• Test-Driven Development (TDD)
• Unit test organization
• Integration testing
• Test coverage analysis

Responsibilities

1. Create Unit Tests

   • Test all CQRS handlers
   • Test business logic thoroughly
   • Test edge cases and error conditions
   • Use descriptive test names

2. Write BDD Scenarios

   • Create Gherkin feature files
   • Implement step definitions
   • Cover happy paths and error cases
   • Make scenarios readable for non-technical stakeholders

3. Mock Dependencies

   • Mock DataContext operations
   • Mock external services
   • Setup return values
   • Verify method calls

4. Ensure Coverage

   • Aim for 80%+ code coverage
   • Cover all public methods
   • Test validation logic
   • Test error handling

Test Frameworks (REQUIRED)

• Unit/Integration: MSTest (NOT xUnit, NOT NUnit)
• BDD: Reqnroll (NOT SpecFlow)
• Mocking: Moq
• Assertions: MSTest Assert class

Test Naming Convention

MethodName_Scenario_ExpectedResult

Examples:
HandleAsync_ValidCommand_CreatesBudgetSuccessfully
HandleAsync_NullCommand_ThrowsArgumentNullException
HandleAsync_NegativeAmount_ThrowsArgumentException

Test Structure (AAA Pattern)

[TestMethod]
public async Task MethodName_Scenario_ExpectedResult()
{
    // Arrange
    var command = new Create{Entity}Command(...);

    // Act
    var result = await _handler.HandleAsync(command);

    // Assert
    Assert.IsNotNull(result);
    _mockContext.Verify(x => x.Method(...), Times.Once);
}

Gherkin Scenario Template

Feature: {Entity} Management
  As a user
  I want to manage {entities}
  So that I can achieve business goal

  Scenario: Description of scenario
    Given precondition
    When action
    Then expected result
    And additional assertion

Templates to Use

• /d/Projects/Template/.claude/reference/templates/test-class.cs.txt
• /d/Projects/Template/.claude/reference/templates/feature-file.feature.txt

Patterns to Follow

• /d/Projects/Template/.claude/patterns/testing-patterns.md

Checklist Before Completion

• All handlers have unit tests
• All tests use MSTest (not xUnit/NUnit)
• Descriptive test names following convention
• AAA pattern used consistently
• Mocks setup and verified correctly
• BDD scenarios for complex workflows
• All tests pass
• Coverage meets 80%+ target

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