public void LessThanOrEqualTo()
        {
            //Arrange
            var isLessThan =
                new LessThanOrEqualTo <int, IContext>(new ConstantInteger <IContext>(1),
                                                      new ConstantInteger <IContext>(2));
            var isEqual =
                new LessThanOrEqualTo <int, IContext>(new ConstantInteger <IContext>(1),
                                                      new ConstantInteger <IContext>(1));

            //Act
            var sut1 = isLessThan.Interpret(_context);
            var sut2 = isEqual.Interpret(_context);

            //Assert
            Assert.True(sut1);
            Assert.True(sut2);
        }