public void CompareNonNullableToNullableSameBaseType(bool nullDate)
{
//Arrange.
PersonEx2NonNullable p1 = ModelsHelper.CreatePersonEx2NonNullable();
PersonEx2 p2 = ModelsHelper.CreatePersonEx2(nullDate);
ObjectComparer comparer = ObjectComparer.Create <PersonEx2NonNullable, PersonEx2>();
//Act.
var result = comparer.Compare(p1, p2, out bool _);
//Assert.
result.Should().NotBeNull();
PropertyComparisonResult propResult = result[nameof(PersonEx2.BirthDate)];
propResult.Should().NotBeNull();
(propResult.Result & ComparisonResult.StringCoercion).Should().Be(ComparisonResult.Undefined, "Comparison without coercion is possible.");
}