Testing utilities, mocks, and base test classes for comprehensive unit and integration testing. Includes Bogus data generation, FluentAssertions, Moq, xUnit, and Entity Framework in-memory testing support.
Testing utilities, mocks, and base test classes for comprehensive unit and integration testing
Myth.Testing is a powerful testing library built on xUnit that provides pre-configured base classes, utilities, and patterns to dramatically simplify your testing experience in .NET applications. Whether you're writing unit tests, integration tests, or database tests, Myth.Testing eliminates boilerplate code and provides a clean, consistent API for all your testing needs.
🚀 Key Features
🧪 Base Test Classes: Pre-configured BaseTests and BaseDatabaseTests<T> with dependency injection
🗄️ Entity Framework Testing: In-memory database support with automatic setup/cleanup
🏗️ Test Data Generation: Integrated Bogus (Faker) for realistic test data creation
🔧 Service Container: Full dependency injection support with service management utilities
🌐 HTTP Client Mocking: Built-in HTTP mocking for external API testing
📊 FluentAssertions Extensions: Enhanced assertion methods for MVC/API responses
⚡ Async Testing: Advanced async patterns with timeout management
🎯 xUnit Integration: Seamless integration with modern xUnit testing framework
🔄 Fixture Support: Shared test fixtures for expensive resource management
⚙️ Configuration Management: In-memory configuration for isolated testing
🏃♂️ Performance Testing: Built-in utilities for testing performance scenarios
🧩 Test Organization: Patterns for organizing and structuring test suites
Seed Data: Support for database seeding and test data setup
public class UserRepositoryTests : BaseDatabaseTests<UserDbContext>
{
private readonly UserRepository _repository;
public UserRepositoryTests()
{
// Register your repository
AddService<UserRepository, UserRepository>();
_repository = GetRequiredService<UserRepository>();
}
[Fact]
public async Task CreateUser_ShouldPersistCorrectly()
{
// Initialize database before each test
await InitializeDatabaseAsync();
try
{
// Arrange
var user = new UserEntity
{
Name = _faker.Name.FullName(),
Email = _faker.Internet.Email(),
IsActive = true,
CreatedAt = DateTime.UtcNow
};
// Act
var result = await _repository.CreateAsync(user);
// Assert
result.Should().NotBeNull();
// Direct database verification
var context = GetContext();
var savedUser = await context.Users.FindAsync(result.Id);
savedUser.Should().NotBeNull();
}
finally
{
// Always cleanup
await CleanupDatabaseAsync();
}
}
[Fact]
public async Task SeedData_ShouldBeAccessible()
{
await InitializeDatabaseAsync();
// Seed test data
var users = new List<UserEntity>();
for (int i = 0; i < 5; i++)
{
users.Add(new UserEntity
{
Name = _faker.Name.FullName(),
Email = _faker.Internet.Email(),
IsActive = true,
CreatedAt = DateTime.UtcNow
});
}
var context = GetContext();
await context.Users.AddRangeAsync(users);
await context.SaveChangesAsync();
// Test logic using seeded data
var allUsers = await _repository.GetAllAsync();
allUsers.Should().HaveCount(5);
await CleanupDatabaseAsync();
}
}
Available Methods:
// Database lifecycle
Task InitializeDatabaseAsync()
Task CleanupDatabaseAsync()
TContext GetContext()
// Inherited from BaseTests
// All service management and configuration methods
Test Data Generation
Myth.Testing includes a pre-configured Bogus (Faker) instance available through the _faker field in all test classes. Use it directly to generate realistic test data:
_faker.Address - Street addresses, cities, postal codes
_faker.Phone - Phone numbers
_faker.Commerce - Product names, prices
_faker.Date - Dates and times
_faker.Lorem - Lorem ipsum text
_faker.Random - Random values (numbers, booleans, enums)
Usage Examples:
public class UserServiceTests : BaseTests
{
[Fact]
public void CreateTestData_Examples()
{
// Simple object creation
var user = new User
{
Id = _faker.Random.Guid(),
Name = _faker.Name.FullName(),
Email = _faker.Internet.Email(),
Age = _faker.Random.Int(18, 65),
IsActive = _faker.Random.Bool(),
CreatedDate = _faker.Date.Recent()
};
// Collections
var users = new List<User>();
for (int i = 0; i < 10; i++)
{
users.Add(new User
{
Id = _faker.Random.Guid(),
Name = _faker.Name.FullName(),
Email = _faker.Internet.Email(),
Age = _faker.Random.Int(18, 65),
IsActive = i % 2 == 0, // Mix of active/inactive
CreatedDate = _faker.Date.Past()
});
}
// Complex objects
var userWithAddress = new User
{
Name = _faker.Name.FullName(),
Email = _faker.Internet.Email(),
Address = new Address
{
Street = _faker.Address.StreetAddress(),
City = _faker.Address.City(),
State = _faker.Address.State(),
ZipCode = _faker.Address.ZipCode(),
Country = _faker.Address.Country()
}
};
}
}
Helper Methods Pattern:
Create static helper methods for common test data scenarios:
public static class TestDataHelper
{
public static User CreateValidUser(Faker faker) => new()
{
Id = faker.Random.Guid(),
Name = faker.Name.FullName(),
Email = faker.Internet.Email(),
Age = faker.Random.Int(18, 65),
IsActive = true,
CreatedDate = DateTime.UtcNow
};
public static List<User> CreateUserList(Faker faker, int count, bool allActive = false)
{
var users = new List<User>();
for (int i = 0; i < count; i++)
{
users.Add(new User
{
Id = faker.Random.Guid(),
Name = faker.Name.FullName(),
Email = faker.Internet.Email(),
Age = faker.Random.Int(18, 65),
IsActive = allActive || i % 2 == 0,
CreatedDate = faker.Date.Past()
});
}
return users;
}
}
// Usage in tests
public class UserServiceTests : BaseTests
{
[Fact]
public void TestMethod()
{
var user = TestDataHelper.CreateValidUser(_faker);
var users = TestDataHelper.CreateUserList(_faker, 5, allActive: true);
}
}
TestFixture Class
Shared fixtures for expensive resources that need to be created once and shared across multiple tests:
Base TestFixture:
public abstract class TestFixture : IDisposable
{
protected readonly IServiceProvider ServiceProvider;
protected readonly Faker Faker;
protected TestFixture()
{
var services = new ServiceCollection();
ConfigureServices(services);
ServiceProvider = services.BuildServiceProvider();
Faker = new Faker();
}
protected abstract void ConfigureServices(IServiceCollection services);
public T GetRequiredService<T>() => ServiceProvider.GetRequiredService<T>();
public T GetService<T>() => ServiceProvider.GetService<T>();
public virtual void Dispose()
{
ServiceProvider?.Dispose();
}
}
Database Fixture Example:
public class DatabaseFixture : TestFixture
{
public const string DatabaseName = "TestDatabase";
protected override void ConfigureServices(IServiceCollection services)
{
services.AddDbContext<UserDbContext>(options =>
options.UseInMemoryDatabase(DatabaseName)
.EnableSensitiveDataLogging());
services.AddTransient<UserRepository>();
services.AddLogging();
}
public UserDbContext GetContext() => GetRequiredService<UserDbContext>();
public async Task SeedDataAsync()
{
var context = GetContext();
if (!await context.Users.AnyAsync())
{
var users = new List<UserEntity>();
for (int i = 0; i < 10; i++)
{
users.Add(new UserEntity
{
Name = Faker.Name.FullName(),
Email = Faker.Internet.Email(),
IsActive = true,
CreatedAt = DateTime.UtcNow
});
}
await context.Users.AddRangeAsync(users);
await context.SaveChangesAsync();
}
}
public async Task CleanDataAsync()
{
var context = GetContext();
context.Users.RemoveRange(context.Users);
await context.SaveChangesAsync();
}
}
// Collection definition for sharing across test classes
[CollectionDefinition("Database Collection")]
public class DatabaseCollection : ICollectionFixture<DatabaseFixture>
{
// This class has no code, and is never created.
// Its purpose is simply to be the place to apply [CollectionDefinition] and all the ICollectionFixture<> interfaces.
}
HTTP Client Fixture Example:
public class HttpClientFixture : TestFixture
{
public HttpClient HttpClient { get; private set; }
protected override void ConfigureServices(IServiceCollection services)
{
// Configure HttpClient with test settings
HttpClient = HttpClientMock.CreateClient(config => config
.ForRoute("/api/users/{id}")
.UsingGet()
.RespondWithSuccess()
.WithJsonResponse(new { Id = 1, Name = "Test User" }));
services.AddSingleton(HttpClient);
services.AddTransient<ExternalApiService>();
}
public override void Dispose()
{
HttpClient?.Dispose();
base.Dispose();
}
}
Usage in Test Classes:
// Single test class fixture
public class UserRepositoryIntegrationTests : IClassFixture<DatabaseFixture>
{
private readonly DatabaseFixture _fixture;
public UserRepositoryIntegrationTests(DatabaseFixture fixture)
{
_fixture = fixture;
}
[Fact]
public async Task GetAllUsers_ShouldReturnSeededData()
{
// Arrange
await _fixture.SeedDataAsync();
var repository = _fixture.GetRequiredService<UserRepository>();
// Act
var users = await repository.GetAllAsync();
// Assert
users.Should().HaveCount(10);
}
}
// Collection fixture (shared across multiple test classes)
[Collection("Database Collection")]
public class UserServiceIntegrationTests
{
private readonly DatabaseFixture _fixture;
public UserServiceIntegrationTests(DatabaseFixture fixture)
{
_fixture = fixture;
}
[Fact]
public async Task CreateUser_ShouldPersistToSharedDatabase()
{
// Test implementation using shared fixture
var repository = _fixture.GetRequiredService<UserRepository>();
// ... test logic
}
}
[Collection("Database Collection")]
public class UserValidationIntegrationTests
{
private readonly DatabaseFixture _fixture;
public UserValidationIntegrationTests(DatabaseFixture fixture)
{
_fixture = fixture;
}
// This test class shares the same DatabaseFixture instance
// with UserServiceIntegrationTests
}
Async Testing Extensions
Enhanced async testing patterns with timeout management and exception handling:
Timeout Testing:
// Basic timeout testing
await TestExtensions.WithTimeoutAsync(
async () =>
{
var result = await service.LongRunningOperationAsync();
result.Should().NotBeNull();
},
TimeSpan.FromSeconds(5)
);
// Custom timeout with cancellation
using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
await TestExtensions.WithTimeoutAsync(
async () =>
{
var result = await service.ProcessDataAsync(cts.Token);
result.Should().BeTrue();
},
TimeSpan.FromSeconds(8),
cts.Token
);
// Testing that operation completes within expected time
var stopwatch = Stopwatch.StartNew();
await TestExtensions.WithTimeoutAsync(
() => service.OptimizedOperationAsync(),
TimeSpan.FromSeconds(2)
);
stopwatch.Stop();
stopwatch.ElapsedMilliseconds.Should().BeLessThan(1000);
Exception Testing:
// Assert specific exception type
await TestExtensions.AssertThrowsAsync<InvalidOperationException>(
() => service.InvalidOperationAsync()
);
// Assert exception with message validation
var exception = await TestExtensions.AssertThrowsAsync<ArgumentException>(
() => service.ProcessInvalidDataAsync(null)
);
exception.Message.Should().Contain("cannot be null");
exception.ParamName.Should().Be("data");
// Assert multiple exception types
await TestExtensions.AssertThrowsAnyAsync<Exception>(
() => service.UnpredictableOperationAsync()
);
// Assert inner exception
var outerException = await TestExtensions.AssertThrowsAsync<ServiceException>(
() => service.WrappedOperationAsync()
);
outerException.InnerException.Should().BeOfType<HttpRequestException>();
No Exception Testing:
// Assert operation completes without throwing
await TestExtensions.AssertDoesNotThrowAsync(
() => service.ValidOperationAsync()
);
// Assert with return value validation
var result = await TestExtensions.AssertDoesNotThrowAsync(
async () =>
{
var data = await service.GetDataAsync();
return data;
}
);
result.Should().NotBeNull();
// Assert with complex validation
await TestExtensions.AssertDoesNotThrowAsync(
async () =>
{
var users = await service.GetUsersAsync();
users.Should().HaveCountGreaterThan(0);
users.Should().OnlyContain(u => !string.IsNullOrEmpty(u.Name));
}
);
Retry Testing:
// Test retry policies
var attempts = 0;
await TestExtensions.WithRetryAsync(
async () =>
{
attempts++;
if (attempts < 3)
throw new TemporaryException("Temporary failure");
var result = await service.GetDataAsync();
result.Should().NotBeNull();
},
maxAttempts: 3,
delay: TimeSpan.FromMilliseconds(100)
);
attempts.Should().Be(3);
Parallel Testing:
// Test concurrent operations
var tasks = Enumerable.Range(1, 10)
.Select(async i =>
{
var result = await service.ProcessAsync(i);
result.Should().Be(i * 2);
});
await TestExtensions.WhenAllAsync(tasks);
// Test with controlled concurrency
var semaphore = new SemaphoreSlim(3, 3);
var concurrentTasks = Enumerable.Range(1, 20)
.Select(async i =>
{
await semaphore.WaitAsync();
try
{
await service.ProcessWithLimitAsync(i);
}
finally
{
semaphore.Release();
}
});
await TestExtensions.WhenAllAsync(concurrentTasks);
🔧 Service Management
Comprehensive dependency injection support for testing scenarios.
Basic Service Registration
public class UserServiceTests : BaseTests
{
public UserServiceTests()
{
// Register concrete instance
AddService<IUserService>(new UserService());
// Register type with automatic lifetime (Transient by default)
AddService<IUserService, UserService>();
// Register with specific lifetime
AddService<IUserService, UserService>(ServiceLifetime.Scoped);
AddService<ICache, MemoryCache>(ServiceLifetime.Singleton);
// Register multiple implementations
AddService<INotificationService, EmailNotificationService>();
AddService<INotificationService, SmsNotificationService>();
}
}
public class MockingTests : BaseTests
{
private readonly Mock<IUserRepository> _mockRepository;
public MockingTests()
{
// Create mocks
_mockRepository = new Mock<IUserRepository>();
// Setup mock behavior
_mockRepository
.Setup(r => r.GetByIdAsync(It.IsAny<Guid>()))
.ReturnsAsync(new User { Id = Guid.NewGuid(), Name = "Test User" });
// Register mock
AddService<IUserRepository>(_mockRepository.Object);
// Replace existing service
ReplaceService<IUserService>(new MockUserService());
// Register factory-based services
AddService<Func<string, IValidator>>(serviceType =>
{
return validationType => validationType switch
{
"email" => new EmailValidator(),
"phone" => new PhoneValidator(),
_ => new DefaultValidator()
};
});
}
[Fact]
public async Task TestWithMock()
{
var service = GetRequiredService<IUserService>();
var result = await service.GetUserAsync(Guid.NewGuid());
result.Should().NotBeNull();
_mockRepository.Verify(r => r.GetByIdAsync(It.IsAny<Guid>()), Times.Once);
}
}
Service Discovery and Validation
public class ServiceValidationTests : BaseTests
{
[Fact]
public void Services_ShouldBeRegisteredCorrectly()
{
// Check if service is registered
IsServiceRegistered<IUserService>().Should().BeTrue();
IsServiceRegistered<INonExistentService>().Should().BeFalse();
// Validate service can be resolved
var service = GetService<IUserService>();
service.Should().NotBeNull();
// Validate required service throws if not registered
Action action = () => GetRequiredService<INonExistentService>();
action.Should().Throw<InvalidOperationException>();
}
[Fact]
public void ServiceLifetimes_ShouldWorkCorrectly()
{
// Register services with different lifetimes
AddService<ITransientService, TransientService>(ServiceLifetime.Transient);
AddService<IScopedService, ScopedService>(ServiceLifetime.Scoped);
AddService<ISingletonService, SingletonService>(ServiceLifetime.Singleton);
// Test singleton behavior
var singleton1 = GetRequiredService<ISingletonService>();
var singleton2 = GetRequiredService<ISingletonService>();
singleton1.Should().BeSameAs(singleton2);
// Test scoped behavior
using var scope1 = CreateScope();
using var scope2 = CreateScope();
var scoped1a = scope1.ServiceProvider.GetRequiredService<IScopedService>();
var scoped1b = scope1.ServiceProvider.GetRequiredService<IScopedService>();
var scoped2 = scope2.ServiceProvider.GetRequiredService<IScopedService>();
scoped1a.Should().BeSameAs(scoped1b);
scoped1a.Should().NotBeSameAs(scoped2);
// Test transient behavior
var transient1 = GetRequiredService<ITransientService>();
var transient2 = GetRequiredService<ITransientService>();
transient1.Should().NotBeSameAs(transient2);
}
}
Scoped Service Testing
public class ScopedServiceTests : BaseTests
{
[Fact]
public async Task ScopedOperation_ShouldUseCorrectScope()
{
// Register scoped service
AddService<IDataContext, TestDataContext>(ServiceLifetime.Scoped);
AddService<IUserRepository, UserRepository>(ServiceLifetime.Scoped);
// Test within scope
using var scope = CreateScope();
var repository = scope.ServiceProvider.GetRequiredService<IUserRepository>();
var context = scope.ServiceProvider.GetRequiredService<IDataContext>();
// Both services should share the same context instance within scope
var user = await repository.CreateAsync(new User { Name = "Test" });
var savedUser = await context.Users.FindAsync(user.Id);
savedUser.Should().NotBeNull();
savedUser.Name.Should().Be("Test");
}
[Fact]
public async Task MultipleScopes_ShouldBeIsolated()
{
AddService<IDataContext, TestDataContext>(ServiceLifetime.Scoped);
using var scope1 = CreateScope();
using var scope2 = CreateScope();
var context1 = scope1.ServiceProvider.GetRequiredService<IDataContext>();
var context2 = scope2.ServiceProvider.GetRequiredService<IDataContext>();
context1.Should().NotBeSameAs(context2);
// Operations in different scopes should be isolated
await context1.Users.AddAsync(new User { Name = "User1" });
await context1.SaveChangesAsync();
var usersInScope2 = await context2.Users.ToListAsync();
usersInScope2.Should().BeEmpty();
}
}
⚙️ Configuration Management
Comprehensive configuration support for testing scenarios with in-memory configuration:
public class ConfigurationTests : BaseTests
{
public ConfigurationTests()
{
// Add simple key-value pairs
AddConfigurationItem("Database:ConnectionString", "Server=test;Database=TestDb");
AddConfigurationItem("Api:BaseUrl", "https://test-api.com");
AddConfigurationItem("Api:Timeout", "30");
AddConfigurationItem("Features:EnableCache", "true");
// Add complex configuration sections
AddConfigurationSection("Logging", new Dictionary<string, string>
{
["LogLevel:Default"] = "Information",
["LogLevel:Microsoft"] = "Warning",
["LogLevel:System"] = "Warning"
});
AddConfigurationSection("Authentication", new Dictionary<string, string>
{
["JWT:Secret"] = "test-secret-key",
["JWT:Issuer"] = "test-issuer",
["JWT:Audience"] = "test-audience",
["JWT:ExpirationMinutes"] = "60"
});
// Configuration is automatically available via DI
var config = GetRequiredService<IConfiguration>();
var connectionString = config["Database:ConnectionString"];
var apiUrl = config["Api:BaseUrl"];
var enableCache = config.GetValue<bool>("Features:EnableCache");
}
[Fact]
public void Configuration_ShouldBeAccessible()
{
var config = GetRequiredService<IConfiguration>();
// Test simple values
config["Database:ConnectionString"].Should().Be("Server=test;Database=TestDb");
config["Api:BaseUrl"].Should().Be("https://test-api.com");
// Test typed values
config.GetValue<int>("Api:Timeout").Should().Be(30);
config.GetValue<bool>("Features:EnableCache").Should().BeTrue();
// Test sections
var jwtSection = config.GetSection("Authentication:JWT");
jwtSection["Secret"].Should().Be("test-secret-key");
jwtSection.GetValue<int>("ExpirationMinutes").Should().Be(60);
}
[Fact]
public void Options_ShouldBindCorrectly()
{
// Configure options binding
ConfigureServices(services =>
{
services.Configure<ApiOptions>(GetRequiredService<IConfiguration>().GetSection("Api"));
services.Configure<JwtOptions>(GetRequiredService<IConfiguration>().GetSection("Authentication:JWT"));
});
var apiOptions = GetRequiredService<IOptionsSnapshot<ApiOptions>>();
var jwtOptions = GetRequiredService<IOptionsSnapshot<JwtOptions>>();
apiOptions.Value.BaseUrl.Should().Be("https://test-api.com");
apiOptions.Value.Timeout.Should().Be(30);
jwtOptions.Value.Secret.Should().Be("test-secret-key");
jwtOptions.Value.ExpirationMinutes.Should().Be(60);
}
}
public class ApiOptions
{
public string BaseUrl { get; set; }
public int Timeout { get; set; }
}
public class JwtOptions
{
public string Secret { get; set; }
public string Issuer { get; set; }
public string Audience { get; set; }
public int ExpirationMinutes { get; set; }
}
🌐 HTTP Client Mocking
Comprehensive HTTP client mocking for testing external API dependencies:
Basic HTTP Mocking
public class HttpClientMockingTests : BaseTests
{
[Fact]
public async Task SingleEndpoint_ShouldReturnMockedResponse()
{
// Single endpoint mock with success response
var httpClient = HttpClientMock.CreateClient(config => config
.ForRoute("/api/users/{id}")
.UsingGet()
.RespondWithSuccess()
.WithJsonResponse(new { Id = 1, Name = "John Doe", Email = "john@example.com" }));
AddService<HttpClient>(httpClient);
var service = GetRequiredService<ExternalApiService>();
var result = await service.GetUserAsync(1);
result.Should().NotBeNull();
result.Id.Should().Be(1);
result.Name.Should().Be("John Doe");
}
[Fact]
public async Task MultipleEndpoints_ShouldHandleDifferentRoutes()
{
// Multiple endpoints mock
var httpClient = HttpClientMock.CreateClientWithEndpoints(
config => config
.ForRoute("/api/users")
.UsingGet()
.RespondWithSuccess()
.WithJsonResponse(new[] { new { Id = 1, Name = "User1" }, new { Id = 2, Name = "User2" } }),
config => config
.ForRoute("/api/users")
.UsingPost()
.RespondWith(HttpStatusCode.Created)
.WithJsonResponse(new { Id = 3, Name = "New User" }),
config => config
.ForRoute("/api/users/{id}")
.UsingDelete()
.RespondWith(HttpStatusCode.NoContent)
);
AddService<HttpClient>(httpClient);
var service = GetRequiredService<ExternalApiService>();
// Test GET
var users = await service.GetUsersAsync();
users.Should().HaveCount(2);
// Test POST
var newUser = await service.CreateUserAsync(new { Name = "New User" });
newUser.Id.Should().Be(3);
// Test DELETE
var deleteResult = await service.DeleteUserAsync(1);
deleteResult.Should().BeTrue();
}
}
Advanced HTTP Mocking Scenarios
public class AdvancedHttpMockingTests : BaseTests
{
[Fact]
public async Task ErrorResponses_ShouldBeHandledCorrectly()
{
var httpClient = HttpClientMock.CreateClientWithEndpoints(
// Success case
config => config
.ForRoute("/api/users/1")
.UsingGet()
.RespondWithSuccess()
.WithJsonResponse(new { Id = 1, Name = "Found User" }),
// Not found case
config => config
.ForRoute("/api/users/999")
.UsingGet()
.RespondWith(HttpStatusCode.NotFound)
.WithJsonResponse(new { Error = "User not found" }),
// Server error case
config => config
.ForRoute("/api/users/error")
.UsingGet()
.RespondWith(HttpStatusCode.InternalServerError)
.WithJsonResponse(new { Error = "Internal server error" })
);
AddService<HttpClient>(httpClient);
var service = GetRequiredService<ExternalApiService>();
// Test success
var user = await service.GetUserAsync(1);
user.Should().NotBeNull();
// Test not found
await service.Invoking(s => s.GetUserAsync(999))
.Should().ThrowAsync<HttpRequestException>();
// Test server error
await service.Invoking(s => s.GetUserAsync(-1)) // assuming this maps to /error
.Should().ThrowAsync<HttpRequestException>();
}
[Fact]
public async Task RequestValidation_ShouldWorkWithMocks()
{
var httpClient = HttpClientMock.CreateClient(config => config
.ForRoute("/api/users")
.UsingPost()
.WithRequestValidation(request =>
{
// Validate request headers
request.Headers.Should().ContainKey("Authorization");
request.Headers["Authorization"].Should().StartWith("Bearer ");
// Validate request content
var content = request.Content.ReadAsStringAsync().Result;
content.Should().Contain("\"name\":");
return true;
})
.RespondWith(HttpStatusCode.Created)
.WithJsonResponse(new { Id = 1, Status = "Created" }));
// Test with valid request
var client = new HttpClient();
client.DefaultRequestHeaders.Add("Authorization", "Bearer test-token");
var response = await client.PostAsJsonAsync("/api/users", new { name = "Test User" });
response.StatusCode.Should().Be(HttpStatusCode.Created);
}
}
HTTP Client Service Integration
public class ApiServiceIntegrationTests : BaseTests
{
private readonly HttpClient _httpClient;
private readonly ExternalApiService _apiService;
public ApiServiceIntegrationTests()
{
// Setup comprehensive HTTP mock
_httpClient = HttpClientMock.CreateClientWithEndpoints(
config => config.ForRoute("/api/users/{id}").UsingGet().RespondWithSuccess().WithJsonResponse(new { Id = 1, Name = "John" }),
config => config.ForRoute("/api/users").UsingPost().RespondWith(HttpStatusCode.Created).WithJsonResponse(new { Id = 2 }),
config => config.ForRoute("/api/users/{id}").UsingPut().RespondWithSuccess(),
config => config.ForRoute("/api/users/{id}").UsingDelete().RespondWith(HttpStatusCode.NoContent)
);
// Register in DI container
AddService<HttpClient>(_httpClient);
AddService<ExternalApiService, ExternalApiService>();
_apiService = GetRequiredService<ExternalApiService>();
}
[Fact]
public async Task FullCrudOperations_ShouldWorkWithMocks()
{
// Create
var createResult = await _apiService.CreateUserAsync(new CreateUserRequest { Name = "New User" });
createResult.Id.Should().Be(2);
// Read
var getResult = await _apiService.GetUserAsync(1);
getResult.Should().NotBeNull();
getResult.Name.Should().Be("John");
// Update
var updateResult = await _apiService.UpdateUserAsync(1, new UpdateUserRequest { Name = "Updated John" });
updateResult.Should().BeTrue();
// Delete
var deleteResult = await _apiService.DeleteUserAsync(1);
deleteResult.Should().BeTrue();
}
}
📊 FluentAssertions Extensions
Enhanced assertions for MVC/API testing with custom extension methods:
public class FluentAssertionsExtensionsTests : BaseTests
{
[Fact]
public async Task HttpResponse_ShouldHaveCustomAssertions()
{
var httpClient = HttpClientMock.CreateClient(config => config
.ForRoute("/api/users/1")
.UsingGet()
.RespondWithSuccess()
.WithJsonResponse(new User { Id = 1, Name = "John Doe" }));
var response = await httpClient.GetAsync("/api/users/1");
// Status code assertions
response.Should().BeStatusCodeOk();
response.Should().BeSuccessStatusCode();
// Content type assertions
response.Should().HaveContentType("application/json");
// Header assertions
response.Should().HaveHeader("Content-Type");
// Extract and validate response data
var user = response.GetAs<User>();
user.Should().NotBeNull();
user.Id.Should().Be(1);
user.Name.Should().Be("John Doe");
}
[Fact]
public async Task ApiResponses_ShouldSupportVariousStatusCodes()
{
var httpClient = HttpClientMock.CreateClientWithEndpoints(
config => config.ForRoute("/api/ok").UsingGet().RespondWithSuccess(),
config => config.ForRoute("/api/created").UsingPost().RespondWith(HttpStatusCode.Created),
config => config.ForRoute("/api/nocontent").UsingDelete().RespondWith(HttpStatusCode.NoContent),
config => config.ForRoute("/api/notfound").UsingGet().RespondWith(HttpStatusCode.NotFound),
config => config.ForRoute("/api/badrequest").UsingPost().RespondWith(HttpStatusCode.BadRequest)
);
// Test various status codes
var okResponse = await httpClient.GetAsync("/api/ok");
okResponse.Should().BeStatusCodeOk();
var createdResponse = await httpClient.PostAsync("/api/created", null);
createdResponse.Should().BeStatusCodeCreated();
var noContentResponse = await httpClient.DeleteAsync("/api/nocontent");
noContentResponse.Should().BeStatusCodeNoContent();
var notFoundResponse = await httpClient.GetAsync("/api/notfound");
notFoundResponse.Should().BeStatusCodeNotFound();
var badRequestResponse = await httpClient.PostAsync("/api/badrequest", null);
badRequestResponse.Should().BeStatusCodeBadRequest();
}
[Fact]
public void Collections_ShouldHaveEnhancedAssertions()
{
var users = new List<User>();
for (int i = 0; i < 5; i++)
{
users.Add(new User
{
Id = _faker.Random.Guid(),
Name = _faker.Name.FullName(),
Email = _faker.Internet.Email(),
Age = _faker.Random.Int(18, 65)
});
}
// Enhanced collection assertions
users.Should().HaveCountGreaterThan(0);
users.Should().OnlyContain(u => !string.IsNullOrEmpty(u.Name));
users.Should().ContainItemsAssignableTo<User>();
// Specific property assertions
users.Should().AllSatisfy(user =>
{
user.Id.Should().NotBeEmpty();
user.Name.Should().NotBeNullOrWhiteSpace();
user.Email.Should().MatchRegex(@"^[^@\s]+@[^@\s]+\.[^@\s]+$");
});
}
}
// Custom FluentAssertions extensions
public static class HttpResponseAssertions
{
public static AndConstraint<HttpResponseMessage> BeStatusCodeOk(this HttpResponseMessageAssertions assertions)
{
assertions.Subject.StatusCode.Should().Be(HttpStatusCode.OK);
return new AndConstraint<HttpResponseMessage>(assertions.Subject);
}
public static AndConstraint<HttpResponseMessage> BeStatusCodeCreated(this HttpResponseMessageAssertions assertions)
{
assertions.Subject.StatusCode.Should().Be(HttpStatusCode.Created);
return new AndConstraint<HttpResponseMessage>(assertions.Subject);
}
public static AndConstraint<HttpResponseMessage> BeStatusCodeNoContent(this HttpResponseMessageAssertions assertions)
{
assertions.Subject.StatusCode.Should().Be(HttpStatusCode.NoContent);
return new AndConstraint<HttpResponseMessage>(assertions.Subject);
}
public static AndConstraint<HttpResponseMessage> BeStatusCodeNotFound(this HttpResponseMessageAssertions assertions)
{
assertions.Subject.StatusCode.Should().Be(HttpStatusCode.NotFound);
return new AndConstraint<HttpResponseMessage>(assertions.Subject);
}
public static AndConstraint<HttpResponseMessage> BeStatusCodeBadRequest(this HttpResponseMessageAssertions assertions)
{
assertions.Subject.StatusCode.Should().Be(HttpStatusCode.BadRequest);
return new AndConstraint<HttpResponseMessage>(assertions.Subject);
}
public static T GetAs<T>(this HttpResponseMessage response)
{
var content = response.Content.ReadAsStringAsync().Result;
return JsonSerializer.Deserialize<T>(content, new JsonSerializerOptions { PropertyNameCaseInsensitive = true });
}
}
🎯 Best Practices
1. Test Organization and Structure
namespace MyApp.Tests.Services
{
public class UserServiceTests : BaseTests
{
private readonly UserService _service;
private readonly Mock<IUserRepository> _mockRepository;
private readonly Mock<IEmailService> _mockEmailService;
public UserServiceTests()
{
// Setup mocks in constructor
_mockRepository = new Mock<IUserRepository>();
_mockEmailService = new Mock<IEmailService>();
// Configure services with proper lifetimes
ConfigureServices(services =>
{
services.AddTransient<IUserRepository>(_ => _mockRepository.Object);
services.AddTransient<IEmailService>(_ => _mockEmailService.Object);
services.AddTransient<UserService>();
services.AddLogging();
});
_service = GetRequiredService<UserService>();
}
[Fact]
public async Task CreateUser_WithValidData_ShouldSucceedAndSendEmail()
{
// Arrange
var userDto = new User
{
Id = _faker.Random.Guid(),
Name = "John Doe",
Email = "john@example.com",
Age = _faker.Random.Int(18, 65),
IsActive = true,
CreatedDate = DateTime.UtcNow
};
_mockRepository
.Setup(r => r.CreateAsync(It.IsAny<User>(), It.IsAny<CancellationToken>()))
.ReturnsAsync((User user, CancellationToken _) => user);
_mockEmailService
.Setup(e => e.SendWelcomeEmailAsync(It.IsAny<string>(), It.IsAny<string>()))
.Returns(Task.CompletedTask);
// Act
var result = await _service.CreateUserAsync(userDto);
// Assert
result.Should().NotBeNull();
result.Name.Should().Be("John Doe");
result.Email.Should().Be("john@example.com");
// Verify interactions
_mockRepository.Verify(r => r.CreateAsync(It.IsAny<User>(), default), Times.Once);
_mockEmailService.Verify(e => e.SendWelcomeEmailAsync("john@example.com", "John Doe"), Times.Once);
}
[Theory]
[InlineData("")]
[InlineData(null)]
[InlineData(" ")]
public async Task CreateUser_WithInvalidName_ShouldThrowValidationException(string invalidName)
{
// Arrange
var userDto = new User
{
Id = _faker.Random.Guid(),
Name = invalidName,
Email = _faker.Internet.Email(),
Age = _faker.Random.Int(18, 65)
};
// Act & Assert
var exception = await _service.Invoking(s => s.CreateUserAsync(userDto))
.Should().ThrowAsync<ValidationException>();
exception.Which.Message.Should().Contain("name");
}
}
}
2. Database Test Patterns and Best Practices
namespace MyApp.Tests.Repositories
{
public class UserRepositoryTests : BaseDatabaseTests<UserDbContext>
{
private readonly UserRepository _repository;
public UserRepositoryTests()
{
AddService<UserRepository, UserRepository>();
_repository = GetRequiredService<UserRepository>();
}
[Fact]
public async Task CreateUser_ShouldPersistCorrectly()
{
// Always initialize database first
await InitializeDatabaseAsync();
try
{
// Arrange
var user = new UserEntityBuilder(_faker)
.WithName("Test User")
.WithEmail("test@example.com")
.Build();
// Act
var result = await _repository.CreateAsync(user);
// Assert
result.Should().NotBeNull();
result.Id.Should().NotBeEmpty();
// Verify in database
var context = GetContext();
var savedUser = await context.Users.FindAsync(result.Id);
savedUser.Should().NotBeNull();
savedUser.Name.Should().Be("Test User");
savedUser.Email.Should().Be("test@example.com");
savedUser.CreatedAt.Should().BeCloseTo(DateTime.UtcNow, TimeSpan.FromSeconds(5));
}
finally
{
// Always cleanup to ensure test isolation
await CleanupDatabaseAsync();
}
}
[Fact]
public async Task GetUsersByStatus_ShouldReturnCorrectUsers()
{
await InitializeDatabaseAsync();
try
{
// Arrange - Seed test data
var activeUsers = new UserEntityBuilder(_faker)
.WithIsActive(true)
.BuildList(3);
var inactiveUsers = new UserEntityBuilder(_faker)
.WithIsActive(false)
.BuildList(2);
var context = GetContext();
await context.Users.AddRangeAsync(activeUsers.Concat(inactiveUsers));
await context.SaveChangesAsync();
// Act
var retrievedActiveUsers = await _repository.GetByStatusAsync(isActive: true);
// Assert
retrievedActiveUsers.Should().HaveCount(3);
retrievedActiveUsers.Should().OnlyContain(u => u.IsActive);
retrievedActiveUsers.Should().BeEquivalentTo(activeUsers, options => options.Excluding(u => u.Id));
}
finally
{
await CleanupDatabaseAsync();
}
}
[Fact]
public async Task ConcurrentUpdates_ShouldHandleOptimisticConcurrency()
{
await InitializeDatabaseAsync();
try
{
// Arrange
var user = new UserEntityBuilder(_faker).Build();
var context = GetContext();
await context.Users.AddAsync(user);
await context.SaveChangesAsync();
// Act - Simulate concurrent updates
var user1 = await _repository.GetByIdAsync(user.Id);
var user2 = await _repository.GetByIdAsync(user.Id);
user1.Name = "Updated by User 1";
user2.Name = "Updated by User 2";
await _repository.UpdateAsync(user1);
// Assert - Second update should fail due to concurrency
await _repository.Invoking(r => r.UpdateAsync(user2))
.Should().ThrowAsync<DbUpdateConcurrencyException>();
}
finally
{
await CleanupDatabaseAsync();
}
}
}
}
3. Async Testing Patterns
public class AsyncServiceTests : BaseTests
{
private readonly AsyncProcessingService _service;
public AsyncServiceTests()
{
AddService<AsyncProcessingService, AsyncProcessingService>();
_service = GetRequiredService<AsyncProcessingService>();
}
[Fact]
public async Task ProcessData_ShouldCompleteWithinTimeout()
{
// Test async operations with timeout
await TestExtensions.WithTimeoutAsync(
async () =>
{
var data = new DataBuilder(_faker).Build();
var result = await _service.ProcessDataAsync(data);
result.Should().NotBeNull();
result.IsProcessed.Should().BeTrue();
},
TimeSpan.FromSeconds(5)
);
}
[Fact]
public async Task ProcessLargeDataset_ShouldCompleteInParallel()
{
// Test parallel processing
var datasets = new DataBuilder(_faker).BuildList(10);
var tasks = datasets.Select(async data =>
{
var result = await _service.ProcessDataAsync(data);
result.Should().NotBeNull();
return result;
});
var results = await TestExtensions.WhenAllAsync(tasks);
results.Should().HaveCount(10);
results.Should().OnlyContain(r => r.IsProcessed);
}
[Fact]
public async Task ProcessWithCancellation_ShouldRespectCancellationToken()
{
using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(1));
var exception = await _service.Invoking(s => s.ProcessLongRunningOperationAsync(cts.Token))
.Should().ThrowAsync<OperationCanceledException>();
exception.Which.CancellationToken.Should().Be(cts.Token);
}
}
4. Integration Test Patterns with Shared Resources
// Shared fixture for expensive resources
public class ApiIntegrationFixture : TestFixture
{
public WebApplicationFactory<Program> Factory { get; private set; }
public HttpClient HttpClient { get; private set; }
protected override void ConfigureServices(IServiceCollection services)
{
Factory = new WebApplicationFactory<Program>()
.WithWebHostBuilder(builder =>
{
builder.ConfigureServices(services =>
{
// Replace services for testing
services.AddScoped<IEmailService, MockEmailService>();
services.AddDbContext<AppDbContext>(options =>
options.UseInMemoryDatabase("IntegrationTestDb"));
});
});
HttpClient = Factory.CreateClient();
services.AddSingleton(Factory);
services.AddSingleton(HttpClient);
}
public override void Dispose()
{
HttpClient?.Dispose();
Factory?.Dispose();
base.Dispose();
}
}
[Collection("API Integration Tests")]
public class UserControllerIntegrationTests : IClassFixture<ApiIntegrationFixture>
{
private readonly ApiIntegrationFixture _fixture;
private readonly HttpClient _httpClient;
public UserControllerIntegrationTests(ApiIntegrationFixture fixture)
{
_fixture = fixture;
_httpClient = fixture.HttpClient;
}
[Fact]
public async Task CreateUser_ShouldReturnCreatedUser()
{
// Arrange
var createRequest = new CreateUserRequest
{
Name = "Integration Test User",
Email = "integration@test.com"
};
// Act
var response = await _httpClient.PostAsJsonAsync("/api/users", createRequest);
// Assert
response.Should().BeStatusCodeCreated();
response.Should().HaveHeader("Location");
var user = response.GetAs<UserResponse>();
user.Should().NotBeNull();
user.Name.Should().Be("Integration Test User");
user.Email.Should().Be("integration@test.com");
}
[Fact]
public async Task GetUsers_ShouldReturnPaginatedResults()
{
// Arrange - Create test data through API
var users = new List<CreateUserRequest>();
for (int i = 1; i <= 15; i++)
{
users.Add(new CreateUserRequest
{
Name = $"User {i}",
Email = $"user{i}@test.com"
});
}
foreach (var user in users)
{
await _httpClient.PostAsJsonAsync("/api/users", user);
}
// Act
var response = await _httpClient.GetAsync("/api/users?page=1&pageSize=10");
// Assert
response.Should().BeStatusCodeOk();
var result = response.GetAs<PagedResult<UserResponse>>();
result.Should().NotBeNull();
result.Items.Should().HaveCount(10);
result.TotalCount.Should().BeGreaterOrEqualTo(15);
result.Page.Should().Be(1);
result.PageSize.Should().Be(10);
}
}
// Collection definition for sharing fixture across test classes
[CollectionDefinition("API Integration Tests")]
public class ApiIntegrationCollection : ICollectionFixture<ApiIntegrationFixture>
{
// This class has no code, and is never created.
// Its purpose is simply to be the place to apply [CollectionDefinition] and all the ICollectionFixture<> interfaces.
}
5. Performance and Load Testing
public class PerformanceTests : BaseTests
{
private readonly PerformanceService _service;
public PerformanceTests()
{
AddService<PerformanceService, PerformanceService>();
_service = GetRequiredService<PerformanceService>();
}
[Fact]
public async Task ProcessData_ShouldCompleteWithinPerformanceThreshold()
{
// Arrange
var data = new DataBuilder(_faker).BuildList(1000);
var stopwatch = Stopwatch.StartNew();
// Act
var results = await _service.ProcessDataBatchAsync(data);
// Assert
stopwatch.Stop();
stopwatch.ElapsedMilliseconds.Should().BeLessThan(2000, "Processing 1000 items should complete within 2 seconds");
results.Should().HaveCount(1000);
results.Should().OnlyContain(r => r.IsProcessed);
}
[Fact]
public async Task ConcurrentProcessing_ShouldHandleHighLoad()
{
// Arrange
const int concurrentRequests = 50;
var data = new DataBuilder(_faker).Build();
// Act
var tasks = Enumerable.Range(1, concurrentRequests)
.Select(async i =>
{
var result = await _service.ProcessDataAsync(data);
return new { RequestId = i, Result = result };
});
var results = await Task.WhenAll(tasks);
// Assert
results.Should().HaveCount(concurrentRequests);
results.Should().OnlyContain(r => r.Result.IsProcessed);
// Verify no duplicate processing
var processedIds = results.Select(r => r.Result.Id).ToList();
processedIds.Should().OnlyHaveUniqueItems();
}
}
🔄 Migration from NUnit
Comprehensive guide for migrating from NUnit to xUnit with Myth.Testing:
Framework Comparison
NUnit
xUnit
Myth.Testing
[OneTimeSetUp]
Constructor
Constructor with ConfigureServices()
[SetUp]
Constructor
Manual InitializeDatabaseAsync()
[TearDown]
IDisposable.Dispose
Manual CleanupDatabaseAsync()
[OneTimeTearDown]
IDisposable.Dispose
TestFixture.Dispose()
[Test]
[Fact]
[Fact]
[TestCase]
[Theory]
[Theory] with [InlineData]
[TestCaseSource]
[Theory]
[Theory] with [MemberData]
Assert.AreEqual
Assert.Equal
.Should().Be() (FluentAssertions)
Assert.IsNotNull
Assert.NotNull
.Should().NotBeNull()
Assert.Throws
Assert.Throws
.Should().Throw<T>()
Migration Examples
Before (NUnit):
[TestFixture]
public class UserServiceTests
{
private UserService _service;
private Mock<IUserRepository> _mockRepository;
[OneTimeSetUp]
public void OneTimeSetUp()
{
// Global setup
}
[SetUp]
public void SetUp()
{
_mockRepository = new Mock<IUserRepository>();
_service = new UserService(_mockRepository.Object);
}
[TearDown]
public void TearDown()
{
// Cleanup after each test
}
[Test]
public async Task CreateUser_ShouldReturnUser()
{
// Arrange
var user = new User { Name = "Test" };
_mockRepository.Setup(r => r.CreateAsync(user)).ReturnsAsync(user);
// Act
var result = await _service.CreateAsync(user);
// Assert
Assert.IsNotNull(result);
Assert.AreEqual("Test", result.Name);
}
[TestCase("")]
[TestCase(null)]
public void CreateUser_WithInvalidName_ShouldThrow(string name)
{
var user = new User { Name = name };
Assert.ThrowsAsync<ArgumentException>(() => _service.CreateAsync(user));
}
}
After (xUnit + Myth.Testing):
public class UserServiceTests : BaseTests
{
private readonly UserService _service;
private readonly Mock<IUserRepository> _mockRepository;
public UserServiceTests()
{
// Constructor replaces [OneTimeSetUp] and [SetUp]
_mockRepository = new Mock<IUserRepository>();
// Configure services with DI
ConfigureServices(services =>
{
services.AddTransient<IUserRepository>(_ => _mockRepository.Object);
services.AddTransient<UserService>();
});
_service = GetRequiredService<UserService>();
}
[Fact]
public async Task CreateUser_ShouldReturnUser()
{
// Arrange
var user = new UserBuilder(_faker).WithName("Test").Build();
_mockRepository.Setup(r => r.CreateAsync(user)).ReturnsAsync(user);
// Act
var result = await _service.CreateAsync(user);
// Assert - Using FluentAssertions
result.Should().NotBeNull();
result.Name.Should().Be("Test");
}
[Theory]
[InlineData("")]
[InlineData(null)]
public async Task CreateUser_WithInvalidName_ShouldThrow(string name)
{
// Arrange
var user = new UserBuilder(_faker).WithName(name).Build();
// Act & Assert
await _service.Invoking(s => s.CreateAsync(user))
.Should().ThrowAsync<ArgumentException>();
}
}
Database Testing Migration
Before (NUnit + Entity Framework):
[TestFixture]
public class UserRepositoryTests
{
private DbContext _context;
private UserRepository _repository;
[SetUp]
public void SetUp()
{
var options = new DbContextOptionsBuilder<UserDbContext>()
.UseInMemoryDatabase(Guid.NewGuid().ToString())
.Options;
_context = new UserDbContext(options);
_repository = new UserRepository(_context);
}
[TearDown]
public void TearDown()
{
_context?.Dispose();
}
}
After (Myth.Testing):
public class UserRepositoryTests : BaseDatabaseTests<UserDbContext>
{
private readonly UserRepository _repository;
public UserRepositoryTests()
{
AddService<UserRepository, UserRepository>();
_repository = GetRequiredService<UserRepository>();
}
[Fact]
public async Task CreateUser_ShouldPersist()
{
await InitializeDatabaseAsync();
try
{
// Test logic here
var user = new UserEntityBuilder(_faker).Build();
var result = await _repository.CreateAsync(user);
result.Should().NotBeNull();
var context = GetContext();
var saved = await context.Users.FindAsync(result.Id);
saved.Should().NotBeNull();
}
finally
{
await CleanupDatabaseAsync();
}
}
}
🚀 Advanced Use Cases
Integration with Other Myth Libraries
public class MythIntegrationTests : BaseTests
{
public MythIntegrationTests()
{
ConfigureServices(services =>
{
// Add Myth.Guard for validation
services.AddGuard();
// Add Myth.Flow for pipelines
services.AddFlow();
// Add Myth.Morph for transformations
services.AddMorph();
// Add your services
services.AddTransient<UserService>();
services.AddTransient<ValidationPipelineService>();
});
}
[Fact]
public async Task ValidationPipeline_ShouldWorkWithMythLibraries()
{
// Arrange
var userDto = new UserBuilder(_faker).Build();
var validator = GetRequiredService<IValidator>();
var pipeline = GetRequiredService<ValidationPipelineService>();
// Act - Test integration between Myth.Guard and Myth.Flow
var result = await pipeline.ProcessUserAsync(userDto);
// Assert
result.Should().NotBeNull();
result.IsValid.Should().BeTrue();
}
}
Testing with Myth.Flow Pipelines
public class PipelineTests : BaseTests
{
private readonly UserProcessingPipeline _pipeline;
public PipelineTests()
{
ConfigureServices(services =>
{
services.AddFlow();
services.AddTransient<UserProcessingPipeline>();
services.AddTransient<IUserValidator, MockUserValidator>();
services.AddTransient<IUserRepository, MockUserRepository>();
});
_pipeline = GetRequiredService<UserProcessingPipeline>();
}
[Fact]
public async Task Pipeline_ShouldProcessUserSuccessfully()
{
// Arrange
var context = new UserProcessingContext
{
User = new UserBuilder(_faker).Build()
};
// Act
var result = await _pipeline.ExecuteAsync(context);
// Assert
result.IsSuccess.Should().BeTrue();
result.Value.User.Should().NotBeNull();
result.Value.IsProcessed.Should().BeTrue();
}
}
Performance Testing with Myth.Testing
public class PerformanceIntegrationTests : BaseTests
{
[Fact]
public async Task BulkUserProcessing_ShouldMeetPerformanceRequirements()
{
// Arrange
var users = new UserBuilder(_faker).BuildList(10000);
var service = GetRequiredService<BulkUserService>();
var stopwatch = Stopwatch.StartNew();
// Act
var results = await service.ProcessUsersAsync(users);
// Assert
stopwatch.Stop();
// Performance assertions
stopwatch.ElapsedMilliseconds.Should().BeLessThan(5000, "Processing 10k users should complete within 5 seconds");
// Functional assertions
results.Should().HaveCount(10000);
results.Should().OnlyContain(r => r.IsProcessed);
// Memory usage assertions (if applicable)
GC.GetTotalMemory(false).Should().BeLessThan(100 * 1024 * 1024, "Memory usage should stay under 100MB");
}
}
📚 Examples and Resources
Complete Test Suite Example
namespace MyApp.Tests
{
// Unit tests
public class UserServiceUnitTests : BaseTests { /* ... */ }
// Integration tests with database
public class UserRepositoryIntegrationTests : BaseDatabaseTests<UserDbContext> { /* ... */ }
// Integration tests with HTTP
public class UserApiIntegrationTests : BaseTests { /* ... */ }
// Performance tests
public class UserPerformanceTests : BaseTests { /* ... */ }
// End-to-end tests
[Collection("E2E Tests")]
public class UserE2ETests : IClassFixture<WebApplicationFactory<Program>> { /* ... */ }
}
Test Data Management
public static class TestDataSets
{
public static class Users
{
public static User ValidUser(Faker faker) => new()
{
Id = faker.Random.Guid(),
Name = faker.Name.FullName(),
Email = faker.Internet.Email(),
Age = faker.Random.Int(18, 65),
IsActive = true,
CreatedDate = DateTime.UtcNow
};
public static User AdminUser(Faker faker) => new()
{
Id = faker.Random.Guid(),
Name = faker.Name.FullName(),
Email = faker.Internet.Email(),
Role = "Admin",
IsActive = true,
CreatedDate = DateTime.UtcNow
};
public static List<User> ActiveUsers(Faker faker, int count = 5)
{
var users = new List<User>();
for (int i = 0; i < count; i++)
{
users.Add(new User
{
Id = faker.Random.Guid(),
Name = faker.Name.FullName(),
Email = faker.Internet.Email(),
IsActive = true,
CreatedDate = faker.Date.Past()
});
}
return users;
}
}
}
// Usage in tests
public class UserServiceDataTests : BaseTests
{
[Fact]
public async Task ProcessUser_WithValidData_ShouldSucceed()
{
var user = TestDataSets.Users.ValidUser(_faker);
// ... test logic
}
}
🤝 Contributing
When extending or contributing to Myth.Testing:
Development Guidelines
Follow Established Patterns: Maintain consistency with existing base classes and patterns
Async/Await Support: Ensure all new features support async operations properly
Comprehensive Documentation: Provide XML documentation for all public APIs
Usage Examples: Include practical examples in documentation
Backwards Compatibility: Avoid breaking changes to existing APIs
Test Coverage: Write tests for new features and maintain high code coverage
Code Quality Standards
/// <summary>
/// Base class for testing services that require database access with Entity Framework Core.
/// Provides automatic database setup, cleanup, and dependency injection.
/// </summary>
/// <typeparam name="TContext">The Entity Framework DbContext type</typeparam>
public abstract class BaseDatabaseTests<TContext> : BaseTests, IAsyncLifetime
where TContext : DbContext
{
/// <summary>
/// Initializes the in-memory database for testing.
/// Call this method at the beginning of each test.
/// </summary>
/// <returns>A task representing the asynchronous operation</returns>
public async Task InitializeDatabaseAsync()
{
// Implementation with proper error handling
}
/// <summary>
/// Cleans up the database after testing.
/// Call this method at the end of each test to ensure test isolation.
/// </summary>
/// <returns>A task representing the asynchronous operation</returns>
public async Task CleanupDatabaseAsync()
{
// Implementation with proper error handling
}
}
Pull Request Guidelines
Include comprehensive tests for new features
Update documentation (README.md and XML docs)
Follow the existing code style and conventions
Add examples demonstrating new functionality
Ensure all existing tests continue to pass
📄 License
This project is licensed under the Apache 2.0 License. See the LICENSE file for details.
Myth.Testing - Making .NET testing simple, powerful, and enjoyable! 🧪✨