ParameterCheckerEx Delegate

Typemock Isolator Developer Guide

Delegate to implement a custom parameter checker

Namespace: TypeMock
Assembly: TypeMock (in TypeMock.dll) Version: 9.3.6.0 (9.3.6.0)

Syntax

public delegate bool ParameterCheckerEx(
	ParameterCheckerEventArgs data
)

Public Delegate Function ParameterCheckerEx ( 
	data As ParameterCheckerEventArgs
) As Boolean

Parameters

data: Type: TypeMockParameterCheckerEventArgs
Data of real parameter value that was passed to the mocked method

Return Value

Type: Boolean
True for parameter values that are expected

Remarks

Typemock Isolator validates parameter values, collections and arrays automatically there are some cases where this is not enough and a custom checker is needed, to do so create a check delegation and pass it as a parameter to Args see IParameters and Mock

Examples

For example, if we need to check that an int parameter is larger then 10 we can write the following code

Copy

public static bool CheckRange(ParameterCheckerEventArgs data)
{
    return (int)data.ArgumentValue > 10;
}

Public Shared Function CheckRange(ByVal data As ParameterCheckerEventArgs) As Boolean
    CheckRange = data.ArgumentValue > 10;
End Function

We can then use it in out test

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[Test]
public void Test()
{
    TestedClass t = new TestedClass();
    // Start mocking TestedClass
    Mock mock = MockManager.Mock(typeof(TestedClass));
    // passInt will be called, arguments must agree with MyChecker
    mock.ExpectAlways("passInt").Args(new ParameterCheckerEx(CheckRange));
    // This will pass 
    t.passInt(16);
    // This will fail 
    t.passInt(3);
    MockManager.Verify();
}

<Test()> _
Public Sub Test()
    Dim t As TestedClass = new TestedClass
    ' Start mocking TestedClass
    Dim mock As Mock = MockManager.Mock(GetType(TestedClass))
    ' passInt will be called, arguments must agree with MyChecker
    mock.ExpectAlways("passInt").Args(New ParameterCheckerEx(AddressOf CheckRange))
    // This will pass 
    t.passInt(16)
    // This will fail 
    t.passInt(3)
    MockManager.Verify()
}

See Check for built in ParameterCheckers See Check.CustomChecker(ParameterCheckerEx, Object) to pass an object to the delegate

Reference

TypeMock Namespace

TypeMockCheck

TypeMockIParameters