Tdd Pattern

Follow test-driven development practices with proper test structure and meaningful assertions.

Write Test First

1. Write a failing test that describes the desired behavior
2. Implement the minimal code to make the test pass
3. Refactor while keeping tests green

This ensures code is testable and requirements are clear before implementation.

Arrange-Act-Assert Pattern

Structure tests clearly:

[Fact]
public void ProcessOrder_WithValidInput_ReturnsOrderId()
{
    // Arrange
    var service = new OrderService();
    var order = new Order { CustomerId = 123, Amount = 99.99m };

    // Act
    var result = service.ProcessOrder(order);

    // Assert
    Assert.NotNull(result);
    Assert.True(result.OrderId > 0);
}

Test Behavior Not Implementation

Test meaningful behavior, not just serialization or data transfer: