Test Exceptions in Xunit ()

Test Exceptions in Xunit ()

In Xunit, you can test exceptions in a few different ways:

  • Using the Assert.Throws method, which expects an exception of a specific type to be thrown:
[Fact] public void TestMethod() { Assert.Throws<ArgumentNullException>(() => MyMethod(null)); }
  • Using the Assert.ThrowsAsync method for asynchronous methods:
[Fact] public async Task TestMethodAsync() { await Assert.ThrowsAsync<ArgumentNullException>(async () => await MyMethodAsync(null)); }
  • Using the Record.Exception method, which returns the exception that was thrown (if any):
[Fact] public void TestMethod() { var ex = Record.Exception(() => MyMethod(null)); Assert.IsType<ArgumentNullException>(ex); }

In all of these methods, you can use the exception object to perform additional assertions on the exception message or other properties.

Examples

  1. "XUnit test exception handling"

    • Description: Explore how XUnit handles exceptions during tests and learn best practices for effective exception testing.
    [Fact] public void TestExceptionHandling() { // Arrange // ... // Act Action act = () => { /* Code that should throw an exception */ }; // Assert Assert.Throws<ExceptionType>(() => act()); }

  2. "XUnit Assert.Throws example"

    • Description: Find examples and explanations on using Assert.Throws in XUnit to verify that a specific exception is thrown.
    [Fact] public void TestExceptionWithAssertThrows() { // Arrange // ... // Act & Assert Assert.Throws<ExceptionType>(() => { /* Code that should throw an exception */ }); }

  3. "XUnit exception message testing"

    • Description: Learn how to test specific exception messages using XUnit to ensure accurate error reporting.
    [Fact] public void TestExceptionMessage() { // Arrange // ... // Act & Assert var exception = Assert.Throws<ExceptionType>(() => { /* Code that should throw an exception */ }); Assert.Equal("Expected Exception Message", exception.Message); }

  4. "XUnit exception handling best practices"

    • Description: Find recommended practices for handling and testing exceptions in XUnit to improve the reliability of your test suite.
    [Fact] public void TestExceptionHandlingBestPractices() { // Arrange // ... // Act & Assert Assert.Throws<ExceptionType>(() => { /* Code that should throw an exception */ }); // Additional assertions and cleanup }

  5. "XUnit exception type testing"

    • Description: Discover how to verify the type of exception thrown in XUnit tests for more granular exception handling.
    [Fact] public void TestExceptionType() { // Arrange // ... // Act & Assert var exception = Assert.Throws<ExceptionType>(() => { /* Code that should throw an exception */ }); Assert.IsType<ExceptionType>(exception); }

  6. "XUnit expected exception not thrown"

    • Description: Find solutions for testing scenarios where an exception is expected but not thrown using XUnit.
    [Fact] public void TestExpectedExceptionNotThrown() { // Arrange // ... // Act Action act = () => { /* Code that should not throw an exception */ }; // Assert Assert.DoesNotThrow(() => act()); }

  7. "XUnit exception testing with Theory"

    • Description: Explore how XUnit's Theory attribute can be used for parameterized testing involving exceptions.
    [Theory] [InlineData(/* Test data */)] public void TestExceptionWithTheory(/* Test parameters */) { // Arrange // ... // Act & Assert Assert.Throws<ExceptionType>(() => { /* Code that should throw an exception based on parameters */ }); }

  8. "XUnit custom exception testing"

    • Description: Learn how to test custom exceptions in XUnit to ensure proper handling of application-specific errors.
    [Fact] public void TestCustomException() { // Arrange // ... // Act & Assert Assert.Throws<CustomException>(() => { /* Code that should throw a custom exception */ }); }

  9. "XUnit exception handling in async tests"

    • Description: Discover techniques for handling and testing exceptions in asynchronous XUnit tests.
    [Fact] public async Task TestAsyncExceptionHandling() { // Arrange // ... // Act & Assert await Assert.ThrowsAsync<ExceptionType>(async () => { /* Async code that should throw an exception */ }); }

  10. "XUnit exception handling with IDisposable"

    • Description: Learn how to handle exceptions in XUnit tests that involve IDisposable resources, ensuring proper cleanup.
    public class TestClass : IDisposable { // Implement IDisposable and cleanup logic [Fact] public void TestExceptionHandlingWithDisposable() { // Arrange using (var disposableObject = new TestClass()) { // Act & Assert Assert.Throws<ExceptionType>(() => { /* Code that should throw an exception */ }); } } }

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