public void SplitStringManyElements_Test()
        {
            var actualResult   = ConsoleCalculator.SplitString("5 + 2 + 6 + 7 + 8 + 9");
            var expectedResult = new string[] { "5", "+", "2" };

            Assert.AreEqual(3, actualResult.Length);
            Assert.AreEqual(expectedResult, actualResult);
        }
        public void SplitStringTwoElements_Test()
        {
            var actualResult   = ConsoleCalculator.SplitString("5 +");
            var expectedResult = new string[] { "5", "+" };

            Assert.AreEqual(2, actualResult.Length);
            Assert.AreEqual(expectedResult, actualResult);
        }
        public void SplitStringManySpacers_Test()
        {
            var actualResult = ConsoleCalculator.SplitString("   5   +    5     ").Length;

            Assert.AreEqual(3, actualResult);
        }
        public void SplitStringLongString_Test()
        {
            var actualResult = ConsoleCalculator.SplitString("gggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg")[0].Length;

            Assert.AreEqual(80, actualResult);
        }
        public void SplitStringEmptyString_Test()
        {
            var actualResult = ConsoleCalculator.SplitString("").Length;

            Assert.AreEqual(0, actualResult);
        }