/// <summary>
/// Applies a step as part of the task to compare two objects for structural equality.
/// </summary>
/// <value>
/// Should return <c>true</c> if the subject matches the expectation or if no additional assertions
/// have to be executed. Should return <c>false</c> otherwise.
/// </value>
/// <remarks>
/// May throw when preconditions are not met or if it detects mismatching data.
/// </remarks>
public bool Handle(IEquivalencyValidationContext context, IEquivalencyValidator parent,
IEquivalencyAssertionOptions config)
{
Type expectedType = config.GetExpectationType(context);
var interfaceTypes = GetIEnumerableInterfaces(expectedType)
.Select(type => "IEnumerable<" + type.GetGenericArguments().Single() + ">")
.ToList();
AssertionScope.Current
.ForCondition(interfaceTypes.Count == 1)
.FailWith("{context:Expectation} implements {0}, so cannot determine which one " +
"to use for asserting the equivalency of the collection. ", interfaceTypes);
if (AssertSubjectIsCollection(context.Expectation, context.Subject))
{
var validator = new EnumerableEquivalencyValidator(parent, context)
{
Recursive = context.IsRoot || config.IsRecursive,
OrderingRules = config.OrderingRules
};
Type typeOfEnumeration = GetTypeOfEnumeration(expectedType);
MethodCallExpression expectationAsArray = ToArray(context.Expectation, typeOfEnumeration);
ConstantExpression subjectAsArray =
Expression.Constant(EnumerableEquivalencyStep.ToArray(context.Subject));
MethodCallExpression executeExpression = Expression.Call(
Expression.Constant(validator),
ExpressionExtensions.GetMethodName(() => validator.Execute <object>(null, null)),
new[] { typeOfEnumeration },
subjectAsArray,
expectationAsArray);
try
{
Expression.Lambda(executeExpression).Compile().DynamicInvoke();
}
catch (TargetInvocationException e)
{
throw e.Unwrap();
}
}
return(true);
}
/// <summary>
/// Applies a step as part of the task to compare two objects for structural equality.
/// </summary>
/// <value>
/// Should return <c>true</c> if the subject matches the expectation or if no additional assertions
/// have to be executed. Should return <c>false</c> otherwise.
/// </value>
/// <remarks>
/// May throw when preconditions are not met or if it detects mismatching data.
/// </remarks>
public bool Handle(IEquivalencyValidationContext context, IEquivalencyValidator parent, IEquivalencyAssertionOptions config)
{
Type subjectType = config.GetSubjectType(context);
Type[] interfaces = GetIEnumerableInterfaces(subjectType);
bool multipleInterfaces = (interfaces.Count() > 1);
if (multipleInterfaces)
{
IEnumerable <Type> enumerableTypes = interfaces.Select(
type => type.GetGenericArguments().Single());
AssertionScope.Current.FailWith(
String.Format(
"{{context:Subject}} is enumerable for more than one type. " +
"It is not known which type should be use for equivalence.{0}" +
"IEnumerable is implemented for the following types: {1}",
Environment.NewLine,
String.Join(", ", enumerableTypes)));
}
if (AssertExpectationIsCollection(context.Expectation))
{
var validator = new EnumerableEquivalencyValidator(parent, context)
{
Recursive = context.IsRoot || config.IsRecursive,
OrderingRules = config.OrderingRules
};
Type typeOfEnumeration = GetTypeOfEnumeration(subjectType);
Expression subjectToArray = ToArray(context.Subject, typeOfEnumeration);
Expression expectationToArray =
Expression.Constant(EnumerableEquivalencyStep.ToArray(context.Expectation));
MethodCallExpression executeExpression = Expression.Call(
Expression.Constant(validator),
ExpressionExtensions.GetMethodName(() => validator.Execute <object>(null, null)),
new Type[] { typeOfEnumeration },
subjectToArray,
expectationToArray);
Expression.Lambda(executeExpression).Compile().DynamicInvoke();
}
return(true);
}
/// <summary>
/// Applies a step as part of the task to compare two objects for structural equality.
/// </summary>
/// <value>
/// Should return <c>true</c> if the subject matches the expectation or if no additional assertions
/// have to be executed. Should return <c>false</c> otherwise.
/// </value>
/// <remarks>
/// May throw when preconditions are not met or if it detects mismatching data.
/// </remarks>
public bool Handle(IEquivalencyValidationContext context, IEquivalencyValidator parent,
IEquivalencyAssertionOptions config)
{
Type expectedType = config.GetExpectationType(context);
Type[] interfaceTypes = GetIEnumerableInterfaces(expectedType);
AssertionScope.Current
.ForCondition(interfaceTypes.Length == 1)
.FailWith(() => new FailReason("{context:Expectation} implements {0}, so cannot determine which one " +
"to use for asserting the equivalency of the collection. ",
interfaceTypes.Select(type => "IEnumerable<" + type.GetGenericArguments().Single() + ">")));
if (AssertSubjectIsCollection(context.Subject))
{
var validator = new EnumerableEquivalencyValidator(parent, context)
{
Recursive = context.IsRoot || config.IsRecursive,
OrderingRules = config.OrderingRules
};
Type typeOfEnumeration = GetTypeOfEnumeration(expectedType);
var subjectAsArray = EnumerableEquivalencyStep.ToArray(context.Subject);
try
{
HandleMethod.MakeGenericMethod(typeOfEnumeration).Invoke(null, new[] { validator, subjectAsArray, context.Expectation });
}
catch (TargetInvocationException e)
{
throw e.Unwrap();
}
}
return(true);
}
/// <summary>
/// Gets a value indicating whether this step can handle the verificationScope subject and/or expectation.
/// </summary>
public bool CanHandle(EquivalencyValidationContext context, IEquivalencyAssertionOptions config)
{
var subjectType = EnumerableEquivalencyStep.GetSubjectType(context, config);
return((context.Subject != null) && IsGenericCollection(subjectType));
}
