Rhino Mocks Constraints

Constraints are a way to verify that a method's arguments match a certain criteria. Rhino Mocks includes a number of built-in constraints, and allows you to define you own custom ones, which will integrate cleanly into the framework. You specify constraints on method arguments using the following syntax:

Expect.Call(view.Ask(null,null)).IgnoreArguments().Constraints(

   Is.Anything(), Is.TypeOf(typeof(SomeType))).Return(null).

You need to pass the exact same number of constraints as the number of arguments of the method. When a method is called during replay state, Rhino Mocks evaluates each constraint against the parameter in the same index, and accepts the method if all the constraints were met. As a note, I got the idea of the current constraints syntax from NMock2, as it is much leaner approach to create constraints.

Rhino Mocks' built in constraints:

Rhino Mocks Constraints

Constraint		Example	Accepted Values	Rejected Values
Is	Anything	Is.Anything()	Anything at all {0,"","whatever",null, etc}	Nothing Whatsoever
	Equal	Is.Equal(3)	3	5
	Not Equal	Is.NotEqual(3)	null, "bar"	3
	Null	Is.Null()	null	5, new object()
	Not Null	Is.NotNull()	new object(), DateTime.Now	null
	Type Of	Is.TypeOf(typeof(Customer)) or Is.TypeOf<Customer>()	myCustomer, new Customer()	null, "str"
	Greater Than	Is.GreaterThan(10)	15,53	2,10
	Greater Than Or Equal	Is.GreaterThanOrEqual(10)	10,15,43	9,3
	Less Than	Is.LessThan(10)	1,2,3,9	10,34
	Less Than Or Equal	Is.LessThanOrEqual(10)	10,9,2,0	34,53,99
	Matching	Is.Matching(Predicate<T>)
	Same	Is.Same(object)
	NotSame	Is.NotSame(object)
Property	Equal To Value	Property.Value("Length",0)	new ArrayList()	"Hello", null
	Null	Property.IsNull("InnerException")	new Exception("exception without inner exception")	new Exception("Exception with inner Exception", new Exception("Inner")
	Not Null	Property.IsNotNull("InnerException")	new Exception("Exception with inner Exception", new Exception("Inner")	new Exception("exception without inner exception")
List	Is In List [the parameter is a collection that contains this value]	List.IsIn(4)	new int[]{1,2,3,4}, new int[]{4,5,6}	new object[]{"",3}
	One Of [parameter equal to one of the objects in this list]	List.OneOf(new int[]{3,4,5})	3,4,5	9,1,""
	Equal	List.Equal(new int[]{4,5,6})	new int[]{4,5,6}, new object[]{4,5,6}	new int[]{4,5,6,7}
Text	Starts With	Text.StartsWith("Hello")	"Hello, World", "Hello, Rhino Mocks"	"", "Bye, Bye"
	Ends With	Text.EndsWith("World")	"World","Champion Of The World"	"world", "World Seria"
	Contains	Text.Contains("or")	"The Horror Movie...", "Either that or this"	"Movie Of The Year"
	Like [Perform regular expression validation]	Text.Like("rhino|Rhinoceros|rhinoceros")	"Rhino Mocks", "Red Rhinoceros"	"Hello world", "Foo bar", Another boring example string"

Read more: Rhino Mocks documentation

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