public void FindFilePrefixTest()
        {
            const string Prefix = "f";

            var queryGenerator = new SearchQueryGeneratorTest();

            // Act
            var result = queryGenerator.FindFilePrefix_Public(Field1Name);
            // Assert 
            Assert.AreEqual(result, Prefix + "0");
            Assert.AreEqual(queryGenerator.FilePrefixes.Count, 1);

            // Act
            result = queryGenerator.FindFilePrefix_Public(Field2Name);
            // Assert 
            Assert.AreEqual(result, Prefix + "1");
            Assert.AreEqual(queryGenerator.FilePrefixes.Count, 2);

            // Act
            result = queryGenerator.FindFilePrefix_Public(Field1Name);
            // Assert 
            Assert.AreEqual(result, Prefix + "0");
            Assert.AreEqual(queryGenerator.FilePrefixes.Count, 2);
        }