public void toBeInstanceOf(Class<?> expectedClass) {
		expectTrue(expectedClass.isInstance(value), "Expected '%s' to be instance of '%s'", this.value, expectedClass.getName());
	}
public void toBeInstanceOf ( Class < ? > expectedClass ) { expectTrue ( expectedClass . isInstance ( value ) , "Expected '%s' to be instance of '%s'" , this . value , expectedClass . getName ( ) ) ; }
Checks if the stored value is an instance of the {@code expectedClass}
<p>This method throws an {@code AssertionError} if the stored value is not of instance of {@code expectedClass}.
@param expectedClass The expected class