public void InstantiateComponent_ThrowsForNullInstance()
{
// Arrange
var componentType = typeof(EmptyComponent);
var factory = new ComponentFactory(new NullResultComponentActivator());
// Act
var ex = Assert.Throws<InvalidOperationException>(() => factory.InstantiateComponent(GetServiceProvider(), componentType));
Assert.Equal($"The component activator returned a null value for a component of type {componentType.FullName}.", ex.Message);
}
public void InstantiateComponent_CreatesInstance_NonComponent()
{
// Arrange
var componentType = typeof(List<string>);
var factory = new ComponentFactory(new DefaultComponentActivator());
// Assert
var ex = Assert.Throws<ArgumentException>(() => factory.InstantiateComponent(GetServiceProvider(), componentType));
Assert.StartsWith($"The type {componentType.FullName} does not implement {nameof(IComponent)}.", ex.Message);
}
public void InstantiateComponent_CreatesInstance()
{
// Arrange
var componentType = typeof(EmptyComponent);
var factory = new ComponentFactory();
// Act
var instance = factory.InstantiateComponent(GetServiceProvider(), componentType);
// Assert
Assert.NotNull(instance);
Assert.IsType <EmptyComponent>(instance);
}
public void InstantiateComponent_IgnoresPropertiesWithoutInjectAttribute()
{
// Arrange
var componentType = typeof(ComponentWithNonInjectableProperties);
var factory = new ComponentFactory(new DefaultComponentActivator());
// Act
var instance = factory.InstantiateComponent(GetServiceProvider(), componentType);
// Assert
Assert.NotNull(instance);
var component = Assert.IsType<ComponentWithNonInjectableProperties>(instance);
// Public, and non-public properties, and properties with non-public setters should get assigned
Assert.NotNull(component.Property1);
Assert.Null(component.Property2);
}
public void InstantiateComponent_AssignsPropertiesWithInjectAttribute()
{
// Arrange
var componentType = typeof(ComponentWithInjectProperties);
var factory = new ComponentFactory();
// Act
var instance = factory.InstantiateComponent(GetServiceProvider(), componentType);
// Assert
Assert.NotNull(instance);
var component = Assert.IsType <ComponentWithInjectProperties>(instance);
// Public, and non-public properties, and properties with non-public setters should get assigned
Assert.NotNull(component.Property1);
Assert.NotNull(component.GetProperty2());
Assert.NotNull(component.Property3);
Assert.NotNull(component.Property4);
}
public void InstantiateComponent_CreatesInstance_WithCustomActivator()
{
// Arrange
var componentType = typeof(EmptyComponent);
var factory = new ComponentFactory(new CustomComponentActivator<ComponentWithInjectProperties>());
// Act
var instance = factory.InstantiateComponent(GetServiceProvider(), componentType);
// Assert
Assert.NotNull(instance);
var component = Assert.IsType<ComponentWithInjectProperties>(instance); // Custom activator returns a different type
// Public, and non-public properties, and properties with non-public setters should get assigned
Assert.NotNull(component.Property1);
Assert.NotNull(component.GetProperty2());
Assert.NotNull(component.Property3);
Assert.NotNull(component.Property4);
}
public void InstantiateComponent_AssignsPropertiesWithInjectAttributeOnBaseType()
{
// Arrange
var componentType = typeof(DerivedComponent);
var factory = new ComponentFactory(new CustomComponentActivator<DerivedComponent>());
// Act
var instance = factory.InstantiateComponent(GetServiceProvider(), componentType);
// Assert
Assert.NotNull(instance);
var component = Assert.IsType<DerivedComponent>(instance);
Assert.NotNull(component.Property1);
Assert.NotNull(component.GetProperty2());
Assert.NotNull(component.Property3);
// Property on derived type without [Inject] should not be assigned
Assert.Null(component.Property4);
// Property on the base type with the [Inject] attribute should
Assert.NotNull(((ComponentWithInjectProperties)component).Property4);
}