Fix the test for checking if a difference is detected when we have a toOne relation

[AntoninGoslin]

This test have to be fixed

testDifferenceDetectedWhenToOneRelationChanged

^ true
"TODO: This test have to be fixed"

"""
    | sd class1 class2 model1 model2 diff method1 method2 | 
    sd := FamixSimpleDiff new.

    model1 := FamixJavaModel new.
    model2 := FamixJavaModel new.

    class1 := FamixJavaClass new name: 'ClassA'.
    class2 := FamixJavaClass new name: 'ClassB'.

    method1 := FamixJavaMethod new name: 'myMethod'.
    method1 signature: 'myMethod()'.
    method2 := FamixJavaMethod new name: 'myMethod'.
    method2 signature: 'myMethod()'.

    method1 parentType: class1.
    method2 parentType: class2.

    model1 add: class1.
    model2 add: class2.

    self deny: (sd compareEntity: method1 to: method2).
    self assert: sd differences size equals: 1.

    diff := sd differences.

    self assert: diff first class equals: FamixSimpleDifferenceRelationChanged.
    self assert: diff first expectedValue equals: class1.
    self assert: diff first actualValue equals: class2

"""