NUnit is a popular unit testing framework for .NET applications. It provides a simple and flexible way to write and execute tests, making it an essential tool for ensuring the correctness of code. NUnit supports various test attributes, assertions, and test runners, making it suitable for both simple and complex test scenarios.
1. Test Fixture: A test fixture is a class or a container for a set of related tests. It is marked with the [TestFixture] attribute in NUnit.
2. Test Case: A test case is a method within a test fixture that represents a specific test scenario. It is marked with the [Test] attribute.
3. Assertions: Assertions are used to verify the expected behavior of the code being tested. NUnit provides various assertion methods, such as Assert.AreEqual and Assert.IsTrue.
4. Test Runners: Test runners are tools or utilities that discover and execute NUnit tests. Examples include the NUnit console runner, NUnit GUI runner, and integration with Visual Studio.
5. SetUp and TearDown: [SetUp] and [TearDown] attributes are used to mark methods that are executed before and after each test case, respectively. They help in setting up and cleaning up test resources.
NUnit is a unit testing framework for .NET applications. It provides a simple and flexible way to write and execute tests to ensure the correctness of code.
A test fixture in NUnit is a class or container for a set of related tests. It is marked with the [TestFixture] attribute and may contain multiple test cases.
A test case in NUnit is a method within a test fixture that represents a specific test scenario. It is marked with the [Test] attribute and contains assertions to verify the expected behavior.
The [SetUp] attribute in NUnit marks a method that is executed before each test case, allowing the setup of necessary resources. The [TearDown] attribute marks a method that is executed after each test case for cleanup.
Assertions in NUnit are used to verify the expected behavior of the code being tested. NUnit provides various assertion methods, such as Assert.AreEqual, Assert.IsTrue, and others.
The [Test] attribute in NUnit marks a method as a test case. When a test runner discovers this attribute, it executes the method as part of the test suite.
Tests in NUnit can be grouped using the [TestFixture] attribute. Each test fixture contains one or more test cases, and the fixtures themselves provide a way to organize and categorize tests.
The NUnit console runner is a command-line tool that discovers and executes NUnit tests. It is particularly useful for automated build processes and continuous integration environments.
Parameterized tests in NUnit allow the execution of the same test logic with different sets of input parameters. This is achieved using the [TestCase] attribute or other attributes supporting parameterization.
NUnit supports asynchronous tests using the [Test] attribute with an async method. The test runner automatically awaits the asynchronous operations, allowing for asynchronous test scenarios.
The Assert.AreEqual method in NUnit is used to verify that two values are equal. It compares the expected and actual values and fails the test if they are not equal.
The NUnit GUI runner is a graphical user interface for discovering and executing NUnit tests. It provides a visual representation of test results and allows developers to interactively run and debug tests.
Expected exceptions in NUnit can be handled using the [Test] attribute with the ExpectedException property or the Assert.Throws method. These approaches allow for specifying and asserting the occurrence of exceptions.
TestCaseSource in NUnit is used to provide sets of test cases from a property, method, or field. It allows for parameterizing tests with various input values.
A test can be marked as ignored in NUnit using the [Ignore] attribute. This signals the test runner to skip the test during execution.
The Assert.IsFalse method in NUnit is used to verify that a specified condition is false. It fails the test if the condition is true.
The TestCase attribute in NUnit is used to define parameterized tests. It allows you to specify different sets of input parameters for a test method.
In NUnit, you can run a subset of tests by using the --test option with the NUnit console runner or by selectively running tests in the GUI runner. Test filtering options allow developers to execute specific tests or test fixtures.
Test categories in NUnit provide a way to categorize tests based on attributes. This allows for the selective execution of tests belonging to specific categories using the test runner.
To write a parameterized test in NUnit using the TestCase attribute, you annotate a test method and provide values for its parameters using the attribute constructor. The test method is then executed for each set of parameter values.
The Assert.IsNull method in NUnit is used to verify that a specified object reference is null. It fails the test if the object reference is not null.
In Visual Studio, NUnit tests can be run using the NUnit Test Adapter. After installing the adapter, the NUnit tests can be discovered and executed through the Visual Studio Test Explorer.
The Assert.Pass method in NUnit is used to explicitly mark a test as passed. The Assert.Fail method is used to explicitly mark a test as failed. These methods provide control over test outcomes.