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of 37What is unit testing and why is it important?
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Unit testing is a software testing technique where individual components or modules of a software application are tested in isolation. It involves testing the smallest testable parts of an application (units) independently from other parts.
Importance:
- Early Bug Detection: Identifies issues during development rather than production
- Code Quality: Ensures code behaves as expected under various conditions
- Refactoring Safety: Provides confidence when modifying existing code
- Documentation: Tests serve as living documentation of how code should behave
- Faster Development: Reduces debugging time and prevents regression bugs
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What is NUnit and what are its key features?
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NUnit is a unit-testing framework for .NET languages, originally ported from JUnit, providing a comprehensive testing solution.
Key Features:
- Rich Assertions: Constraint-based assertion model with
Assert.That() - Attributes: Decorative attributes for test methods, classes, and setup/teardown
- Parameterized Tests:
[TestCase]and[TestCaseSource]for data-driven testing - Parallel Execution: Built-in support for parallel test execution
- Custom Constraints: Extensible constraint system for domain-specific assertions
- Test Categories: Organize and filter tests using
[Category]attribute
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What are the basic attributes used in NUnit for marking test methods?
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Essential NUnit Attributes:
[Test]: Marks a method as a test method[TestFixture]: Marks a class as containing test methods[SetUp]: Method runs before each test method[TearDown]: Method runs after each test method[OneTimeSetUp]: Runs once before all tests in the fixture[OneTimeTearDown]: Runs once after all tests in the fixture
[TestFixture]
public class CalculatorTests
{
[SetUp]
public void Setup() { /* Initialize before each test */ }
[Test]
public void Add_TwoNumbers_ReturnsSum() { /* Test logic */ }
}
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How do you write assertions in NUnit?
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NUnit uses constraint-based assertions with Assert.That() for readable and expressive test validation.
Basic Assertions:
[Test]
public void TestAssertions()
{
int result = Calculator.Add(2, 3);
// Equality
Assert.That(result, Is.EqualTo(5));
// Comparison
Assert.That(result, Is.GreaterThan(0));
Assert.That(result, Is.LessThanOrEqualTo(10));
// Null/Not Null
Assert.That(result, Is.Not.Null);
// Boolean
Assert.That(result > 0, Is.True);
// String assertions
string message = "Hello World";
Assert.That(message, Does.Contain("World"));
Assert.That(message, Does.StartWith("Hello"));
}
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How do you handle collections in NUnit assertions?
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NUnit provides specialized assertions for collections using CollectionAssert and constraint syntax.
Collection Assertions:
[Test]
public void TestCollections()
{
var numbers = new[] { 1, 2, 3, 4, 5 };
var expected = new[] { 1, 2, 3, 4, 5 };
// Collection equality
Assert.That(numbers, Is.EqualTo(expected));
// Contains element
Assert.That(numbers, Contains.Item(3));
// Collection size
Assert.That(numbers, Has.Length(5));
Assert.That(numbers, Has.Count.EqualTo(5));
// All items match condition
Assert.That(numbers, Is.All.GreaterThan(0));
// Using CollectionAssert
CollectionAssert.AreEqual(expected, numbers);
CollectionAssert.Contains(numbers, 3);
CollectionAssert.IsSubsetOf(new[] { 1, 2 }, numbers);
}
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What is the AAA pattern in unit testing?
How do you handle setup and teardown in NUnit vs xUnit?
What are parameterized tests and how do you create them?
What are test categories and how do you use them?
How do you test exceptions in NUnit and xUnit?
What is the difference between Assert, Assume, and CollectionAssert?
How do you create data-driven tests with external data sources?
What are test doubles and when would you use them?
How do you test asynchronous methods?
What is test fixture setup and when should you use it?
How do you organize large test suites effectively?
What are the best practices for writing maintainable unit tests?
How do you handle test data and avoid test data pollution?
What is the difference between integration tests and unit tests?
How do you implement custom assertions and constraint objects?
How do you handle test parallelization and thread safety?
How do you implement advanced mocking scenarios with behavior verification?
How do you test legacy code that was not designed for testing?
How do you implement property-based testing or fuzzing?
How do you implement contract testing for APIs?
How do you handle flaky tests and improve test reliability?
How do you implement comprehensive test reporting and metrics?
How do you test microservices and distributed systems?
How do you implement mutation testing for test quality assessment?
How do you optimize test performance for large test suites?
How do you implement advanced test doubles with state verification?
How do you test performance and implement performance regression detection?
How do you implement comprehensive error handling testing?
How do you test cross-platform compatibility and environment-specific behavior?
How do you implement security testing in unit tests?
How do you implement advanced test lifecycle management and cleanup?
How do you implement behavior-driven development (BDD) style tests?
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