private static void TestEquals(MethodInfo constructor, InterestingValueFactory valueFactory, Action<object, object, bool, string> verify)
{
var parameters = constructor.GetParameters();
var aparams = new object[parameters.Length];
var bparams = new object[parameters.Length];
var usedInEquals = new bool[parameters.Length];
for (int i = 0; i < parameters.Length; i++)
{
var p = parameters[i];
if (p.ParameterType.IsSubclassOf(typeof(UsedInEquals)))
{
usedInEquals[i] = true;
}
else if (p.ParameterType.IsSubclassOf(typeof(NotUsedInEquals)))
{
usedInEquals[i] = false;
}
else
{
throw new InvalidCastException("Ambiguous typing, could not determine if type is used in equals check or not.");
}
var caster = p.ParameterType.GetMethod("op_Implicit");
var boxedType = p.ParameterType.GetGenericArguments()[0];
aparams[i] = caster.Invoke(null, new[] { valueFactory.A(boxedType) });
bparams[i] = caster.Invoke(null, new[] { valueFactory.B(boxedType) });
}
//Interesting values generated
object allAs = constructor.Invoke(null, aparams); //use the all a's for equality checks
var current = new object[parameters.Length];
aparams.CopyTo(current, 0);
var isA = new bool[parameters.Length];
for (int i = 0; i < parameters.Length; i++)
{
isA[i] = true;
}
//Test all a's scenario
var objUnderTest = constructor.Invoke(null, current);
verify(objUnderTest, allAs, true, string.Join("",isA.Select(x=>x?"A":"B")));
for (int j = 0; j < parameters.Length; j++)
{
current[j] = aparams[j];
isA[j] = true;
for (int i = j; i < parameters.Length; i++) // toggle ever parameter remaining
{
current[i] = bparams[i];
isA[i] = false;
objUnderTest = constructor.Invoke(null, current);
bool shouldBeEqual = ShouldBeEqual(isA, usedInEquals); //if no critical params have changed
verify(objUnderTest, allAs, shouldBeEqual, string.Join("", isA.Select(x => x ? "A" : "B")));
current[i] = aparams[i];
isA[i] = true;
}
current[j] = bparams[j];
isA[j] = false;
}
}
public static void TestGetHashCode(MethodInfo constructor, InterestingValueFactory valueFactory)
{
TestEquals(constructor, valueFactory, TestHashCodeForSingleCase);
}
