public void GetImportantThingTest_ReturnsString()
        {
            var thing = new ImportantThingDefault();

            var result = thing.GetImportantThing(-100);

            Assert.AreEqual("magic string!", result);
        }
        public void GetImportantThingTest_ReturnsInt()
        {
            var thing = new ImportantThingDefault();

            var result = thing.GetImportantThing(1000);

            Assert.AreEqual(-1, result);
        }