Unit Testing with RAD Studio

Quality software requires thorough testing. Learn how to write effective unit tests.

Why Unit Test?

Unit testing provides:

• Confidence in code changes
• Documentation of expected behavior
• Faster debugging
• Better design

Getting Started

Test Framework Setup

Configure your testing framework:

program TestProject;

uses
  TestFramework,
  MyUnitTests;

begin
  RegisterTests;
  RunTests;
end.

Writing Your First Test

procedure TestAddition;
begin
  AssertEquals(4, Add(2, 2));
end;

procedure TestSubtraction;
begin
  AssertEquals(0, Subtract(2, 2));
end;

Test Structure

Follow the AAA pattern:

1. Arrange: Set up test data
2. Act: Execute the code
3. Assert: Verify results

procedure TestUserCreation;
var
  User: TUser;
begin
  // Arrange
  User := TUser.Create;

  // Act
  User.Name := 'Test User';
  User.Save;

  // Assert
  AssertTrue(User.ID > 0);

  User.Free;
end;

Best Practices

1. One assertion per test (when practical)
2. Test edge cases
3. Use descriptive test names
4. Keep tests independent
5. Mock external dependencies

Code Coverage

Aim for high coverage but focus on critical paths:

• Business logic: 90%+
• Utilities: 80%+
• UI code: 60%+

Conclusion

Invest in testing. Your future self will thank you!