/// <summary>
/// Creates a new array based on a request.
/// </summary>
/// <param name="request">The request that describes what to create.</param>
/// <param name="context">A context that can be used to create other specimens.</param>
/// <returns>
/// An array of the requested type if possible; otherwise a <see cref="NoSpecimen"/>
/// instance.
/// </returns>
/// <remarks>
/// <para>
/// If <paramref name="request"/> is a request for an array and <paramref name="context"/>
/// can satisfy a <see cref="MultipleRequest"/> for the element type, the return value is a
/// populated array of the requested type. If not, the return value is a
/// <see cref="NoSpecimen"/> instance.
/// </para>
/// </remarks>
public object Create(object request, ISpecimenContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
// This is performance-sensitive code when used repeatedly over many requests.
// See discussion at https://github.com/AutoFixture/AutoFixture/pull/218
var type = request as Type;
if (type == null)
{
return(new NoSpecimen(request));
}
if (!type.IsArray)
{
return(new NoSpecimen(request));
}
var elementType = type.GetElementType();
var elements = context.Resolve(new MultipleRequest(elementType)) as IEnumerable;
if (elements == null)
{
return(new NoSpecimen(request));
}
return(ArrayRelay.ToArray(elements, elementType));
}
public void SutIsSpecimenBuilder()
{
// Fixture setup
// Exercise system
var sut = new ArrayRelay();
// Verify outcome
Assert.IsAssignableFrom<ISpecimenBuilder>(sut);
// Teardown
}
public void CreateWithNullContextThrows()
{
// Fixture setup
var sut = new ArrayRelay();
var dummyRequest = new object();
// Exercise system and verify outcome
Assert.Throws<ArgumentNullException>(() =>
sut.Create(dummyRequest, null));
// Teardown
}
public void CreateWithNoneArrayRequestReturnsCorrectResult(object request)
{
// Fixture setup
var sut = new ArrayRelay();
// Exercise system
var dummyContext = new DelegatingSpecimenContext();
var result = sut.Create(request, dummyContext);
// Verify outcome
var expectedResult = new NoSpecimen(request);
Assert.Equal(expectedResult, result);
// Teardown
}
public void CreateWithArrayRequestReturnsCorrectResult(Type request, Type itemType)
{
// Fixture setup
var expectedRequest = new MultipleRequest(itemType);
object expectedResult = Array.CreateInstance(itemType, 0);
var context = new DelegatingSpecimenContext { OnResolve = r => expectedRequest.Equals(r) ? expectedResult : new NoSpecimen(r) };
var sut = new ArrayRelay();
// Exercise system
var result = sut.Create(request, context);
// Verify outcome
Assert.Equal(expectedResult, result);
// Teardown
}
public void CreateConvertsEnumerableToArray()
{
// Fixture setup
var request = typeof(int[]);
var expectedRequest = new MultipleRequest(typeof(int));
var enumerable = Enumerable.Range(1, 3);
var context = new DelegatingSpecimenContext { OnResolve = r => expectedRequest.Equals(r) ? (object)enumerable : new NoSpecimen(r) };
var sut = new ArrayRelay();
// Exercise system
var result = sut.Create(request, context);
// Verify outcome
var a = Assert.IsAssignableFrom<int[]>(result);
Assert.True(enumerable.SequenceEqual(a));
// Teardown
}
/// <summary>
/// Creates a new array based on a request.
/// </summary>
/// <param name="request">The request that describes what to create.</param>
/// <param name="context">A context that can be used to create other specimens.</param>
/// <returns>
/// An array of the requested type if possible; otherwise a <see cref="NoSpecimen"/>
/// instance.
/// </returns>
/// <remarks>
/// <para>
/// If <paramref name="request"/> is a request for an array and <paramref name="context"/>
/// can satisfy a <see cref="MultipleRequest"/> for the element type, the return value is a
/// populated array of the requested type. If not, the return value is a
/// <see cref="NoSpecimen"/> instance.
/// </para>
/// </remarks>
public object Create(object request, ISpecimenContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
return((from t in request.Maybe().OfType <Type>()
where t.IsArray
let elementType = t.GetElementType()
let e = context.Resolve(new MultipleRequest(elementType)) as IEnumerable
where e != null
select ArrayRelay.ToArray(e, elementType))
.DefaultIfEmpty(new NoSpecimen(request))
.Single());
}
public void CreateReturnsCorrectResultWhenContextReturnsNonEnumerableResult(object response)
{
// Fixture setup
var request = typeof(object[]);
var context = new DelegatingSpecimenContext { OnResolve = r => response };
var sut = new ArrayRelay();
// Exercise system
var result = sut.Create(request, context);
// Verify outcome
var expectedResult = new NoSpecimen(request);
Assert.Equal(expectedResult, result);
// Teardown
}