public void should_access_member_of_most_derived_class()
{
var demoClass = new PolymorphismDemoClass();
var castToBaseClass = (PolymorphismDemoClassBase) demoClass;
string actualValue = castToBaseClass.VirtualMethod();
// please change the variable value to fix the test.
const string expected = "";
Assert.Equal(expected, actualValue);
}
public void should_throw_exception_if_it_is_not_castable()
{
var demoClass = new PolymorphismDemoClass();
object castToObject = demoClass;
// please change the variable value to fix the test.
Type expectedExceptionType = typeof(ArgumentException);
Assert.NotEqual(typeof(SystemException), expectedExceptionType);
Assert.NotEqual(typeof(Exception), expectedExceptionType);
Assert.Throws(expectedExceptionType, () => (StringBuilder) castToObject);
}
public void should_return_casted_result_if_it_is_castable()
{
var demoClass = new PolymorphismDemoClass();
var castToBaseClass = demoClass as PolymorphismDemoClassBase;
bool isNull = castToBaseClass == null;
// please change the variable value to fix the test.
const bool expected = true;
Assert.Equal(expected, isNull);
}
public void should_return_null_if_it_is_not_castable()
{
var demoClass = new PolymorphismDemoClass();
object castToObject = demoClass;
var castResult = castToObject as StringBuilder;
bool isNull = castResult == null;
// please change the variable value to fix the test.
const bool expected = false;
Assert.Equal(expected, isNull);
}
public void should_reference_to_same_object_after_casting()
{
var demoClass = new PolymorphismDemoClass();
var castToBaseClass = (PolymorphismDemoClassBase)demoClass;
bool referenceEqual = ReferenceEquals(demoClass, castToBaseClass);
// please change the variable value to fix the test.
const bool expected = false;
Assert.Equal(expected, referenceEqual);
}
