public void CreateCallSite_CreatesInstanceCallSite_IfTypeHasDefaultOrPublicParameterlessConstructor(Type type)
{
// Arrange
var descriptor = new ServiceDescriptor(type, type, ServiceLifetime.Transient);
var service = new Service(descriptor);
var serviceProvider = new ServiceProvider(new[] { descriptor });
// Act
var callSite = service.CreateCallSite(serviceProvider, new HashSet<Type>());
// Assert
Assert.IsType<CreateInstanceCallSite>(callSite);
}
public void CreateCallSite_Throws_IfTypeHasNoPublicConstructors()
{
// Arrange
var type = typeof(TypeWithNoPublicConstructors);
var expectedMessage = $"A suitable constructor for type '{type}' could not be located. " +
"Ensure the type is concrete and services are registered for all parameters of a public constructor.";
var descriptor = new ServiceDescriptor(type, type, ServiceLifetime.Transient);
var service = new Service(descriptor);
var serviceProvider = new ServiceProvider(new[] { descriptor });
// Act and Assert
var ex = Assert.Throws<InvalidOperationException>(() => service.CreateCallSite(serviceProvider, new HashSet<Type>()));
Assert.Equal(expectedMessage, ex.Message);
}
public void CreateCallSite_UsesNullaryConstructorIfServicesCannotBeInjectedIntoOtherConstructors()
{
// Arrange
var type = typeof(TypeWithParameterizedAndNullaryConstructor);
var descriptor = new ServiceDescriptor(type, type, ServiceLifetime.Transient);
var service = new Service(descriptor);
var serviceProvider = new ServiceProvider(new[] { descriptor });
// Act
var callSite = service.CreateCallSite(serviceProvider, new HashSet<Type>());
// Assert
Assert.IsType<CreateInstanceCallSite>(callSite);
}
public void CreateCallSite_CreatesConstructorCallSite_IfTypeHasConstructorWithInjectableParameters(Type type)
{
// Arrange
var descriptor = new ServiceDescriptor(type, type, ServiceLifetime.Transient);
var service = new Service(descriptor);
var serviceProvider = GetServiceProvider(
descriptor,
new ServiceDescriptor(typeof(IFakeService), new FakeService())
);
// Act
var callSite = service.CreateCallSite(serviceProvider, new HashSet<Type>());
// Assert
var constructorCallSite = Assert.IsType<ConstructorCallSite>(callSite);
Assert.Equal(new[] { typeof(IFakeService) }, GetParameters(constructorCallSite));
}
public void CreateCallSite_ThrowsIfMultipleNonOverlappingConstructorsForGenericTypesCanBeResolved()
{
// Arrange
var type = typeof(TypeWithGenericServices);
var expectedMessage = $"Unable to activate type '{type}'. The following constructors are ambigious:";
var descriptor = new ServiceDescriptor(type, type, ServiceLifetime.Transient);
var serviceProvider = GetServiceProvider(
new ServiceDescriptor(typeof(IFakeService), typeof(FakeService), ServiceLifetime.Transient),
new ServiceDescriptor(typeof(IFakeMultipleService), typeof(FakeService), ServiceLifetime.Transient),
new ServiceDescriptor(typeof(IFakeOpenGenericService<>), typeof(FakeOpenGenericService<>), ServiceLifetime.Transient)
);
var service = new Service(descriptor);
// Act and Assert
var ex = Assert.Throws<InvalidOperationException>(
() => service.CreateCallSite(serviceProvider, new HashSet<Type>()));
Assert.StartsWith(expectedMessage, ex.Message);
}
public void CreateCallSite_ThrowsIfMultipleNonOverlappingConstructorsCanBeResolved(
Type type,
IServiceProvider serviceProvider,
Type[][] expectedConstructorParameterTypes)
{
// Arrange
var expectedMessage =
string.Join(
Environment.NewLine,
$"Unable to activate type '{type}'. The following constructors are ambigious:",
GetConstructor(type, expectedConstructorParameterTypes[0]),
GetConstructor(type, expectedConstructorParameterTypes[1]));
var descriptor = new ServiceDescriptor(type, type, ServiceLifetime.Transient);
var service = new Service(descriptor);
// Act and Assert
var ex = Assert.Throws<InvalidOperationException>(
() => service.CreateCallSite((ServiceProvider)serviceProvider, new HashSet<Type>()));
Assert.Equal(expectedMessage, ex.Message);
}
public void CreateCallSite_ThrowsIfTypeHasNoConstructurWithResolvableParameters(Type type)
{
// Arrange
var descriptor = new ServiceDescriptor(type, type, ServiceLifetime.Transient);
var service = new Service(descriptor);
var serviceProvider = GetServiceProvider(
new ServiceDescriptor(typeof(IFakeMultipleService), typeof(FakeService), ServiceLifetime.Transient),
new ServiceDescriptor(typeof(IFakeScopedService), typeof(FakeService), ServiceLifetime.Transient)
);
// Act and Assert
var ex = Assert.Throws<InvalidOperationException>(
() => service.CreateCallSite(serviceProvider, new HashSet<Type>()));
Assert.Equal($"No constructor for type '{type}' can be instantiated using services from the service container and default values.",
ex.Message);
}
public void CreateCallSite_ThrowsIfTypeHasSingleConstructorWithUnresolvableParameters()
{
// Arrange
var type = typeof(TypeWithParameterizedConstructor);
var descriptor = new ServiceDescriptor(type, type, ServiceLifetime.Transient);
var service = new Service(descriptor);
var serviceProvider = GetServiceProvider();
// Act and Assert
var ex = Assert.Throws<InvalidOperationException>(
() => service.CreateCallSite(serviceProvider, new HashSet<Type>()));
Assert.Equal($"Unable to resolve service for type '{typeof(IFakeService)}' while attempting to activate '{type}'.",
ex.Message);
}
public void CreateCallSite_ConsidersConstructorsWithDefaultValues(
IServiceProvider serviceProvider,
Type[] expectedConstructorParameters)
{
// Arrange
var type = typeof(TypeWithDefaultConstructorParameters);
var descriptor = new ServiceDescriptor(type, type, ServiceLifetime.Transient);
var service = new Service(descriptor);
// Act
var callSite = service.CreateCallSite((ServiceProvider)serviceProvider, new HashSet<Type>());
// Assert
var constructorCallSite = Assert.IsType<ConstructorCallSite>(callSite);
Assert.Equal(expectedConstructorParameters, GetParameters(constructorCallSite));
}
public void CreateCallSite_PicksConstructorWithTheMostNumberOfResolvedParameters(
Type type,
IServiceProvider serviceProvider,
Type[] expectedConstructorParameters)
{
// Arrange
var descriptor = new ServiceDescriptor(type, type, ServiceLifetime.Transient);
var service = new Service(descriptor);
// Act
var callSite = service.CreateCallSite((ServiceProvider)serviceProvider, new HashSet<Type>());
// Assert
var constructorCallSite = Assert.IsType<ConstructorCallSite>(callSite);
Assert.Equal(expectedConstructorParameters, GetParameters(constructorCallSite));
}