public void ReturnsExpectedResults()
            {
                ReadDownColumnPuzzle puzzle = new ReadDownColumnPuzzle {
                    SpecialCharacter = 'm', RandomSeed = 42
                };

                var results = puzzle.InsertSpecialCharacterInPattern("__x___");

                Assert.AreEqual("m_x___", results[0]);
                Assert.AreEqual("_mx___", results[1]);
                Assert.AreEqual("__xm__", results[2]);
                Assert.AreEqual("__x_m_", results[3]);
                Assert.AreEqual("__x__m", results[4]);
            }