public void ReplaceWords_StrDictIsNotNull_ReturnsTrue()
        {
            string testStr  = "This is a test";
            var    testDict = new Dictionary <string, string>()
            {
                { "test", "hest" }
            };
            var sm = new StringManipulator();

            var result = sm.ReplaceWords(testStr, testDict);

            Assert.IsNotNull(result);
        }