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    <p>One options is to test each call apart and all of them together. If you test A&amp;B&amp;C, you can limit yourself to testing A,B,C apart and A&amp;B&amp;C together. One option is the next code(made some assumptions):</p> <pre><code> [TestFixture] public class ToTestFixture { [SetUp] public void SetUp() { _instance = new ToTest(); _instance.InputDataStore(1, "1"); _instance.InputDataStore(2, "2"); _instance.InputDataStore(3, "3"); _instance.InputDataStore(4, "4"); } private ToTest _instance; [TestCase("{DS1}","1")] [TestCase("{DS2}", "2")] [TestCase("{DS3}", "3")] [TestCase("{DS4}", "4")] [TestCase("{DS1}{DS2}{DS3}{DS4}", "1234")] [Test] public void TestPrefixReplacements(string input, string expectedResult) { _instance.Prefix = input; //Call the input method which will raise the Output event which we can test _instance.Input("Any string goes here as we test only prefix." ); Assert.AreEqual(expectedResult, _instance.Prefix); } } internal enum OutputsEnum { OutputBeforeModified, OutputModified, OutputAfterModified } public class ToTest { public event Action&lt;int, string&gt; Output = (x, result) =&gt; Console.WriteLine(x.ToString() + result); public string Prefix { get; set; } public string Postfix { get; set; } private List&lt;string&gt; DataStoreContents = new List&lt;string&gt;() {"1", "2", "3", "4"}; public void Input(string Data) { if (Output != null) { if (!String.IsNullOrEmpty(Prefix)) { Prefix = Prefix.Replace("{DS1}", DataStoreContents[0]); Prefix = Prefix.Replace("{DS2}", DataStoreContents[1]); Prefix = Prefix.Replace("{DS3}", DataStoreContents[2]); Prefix = Prefix.Replace("{DS4}", DataStoreContents[3]); } if (!String.IsNullOrEmpty(Postfix)) { Postfix = Postfix.Replace("{DS1}", DataStoreContents[0]); Postfix = Postfix.Replace("{DS2}", DataStoreContents[1]); Postfix = Postfix.Replace("{DS3}", DataStoreContents[2]); Postfix = Postfix.Replace("{DS4}", DataStoreContents[3]); } Output((int) OutputsEnum.OutputBeforeModified, Data); Output((int) OutputsEnum.OutputModified, Prefix + Data + Postfix); Output((int) OutputsEnum.OutputAfterModified, Data); } } public void InputDataStore(int DataStore, string Data) { if (DataStore &lt; 1 || DataStore &gt; 4) throw new ArgumentOutOfRangeException("Datastore number out of range"); DataStoreContents[DataStore - 1] = Data; } } </code></pre> <p>Anyhow I feel there is a bond between "DS1" and the index of the array. (1-0, 2-1). This means next refactoring is possible:</p> <pre><code>Prefix = Prefix.Replace("{DS"+index+"}", DataStoreContents[index-1]); </code></pre> <p>More than that I guess output action decision is strange and two if-s are duplicate code. This is what I mean: </p> <pre><code> public void Input(string Data) { if (Output != null) { Prefix = ApplyReplaceRules(Prefix); Postfix = ApplyReplaceRules(Postfix); Output((int) OutputsEnum.OutputBeforeModified, Data); Output((int) OutputsEnum.OutputModified, Prefix + Data + Postfix); Output((int) OutputsEnum.OutputAfterModified, Data); } } private string ApplyReplaceRules(string patternString) { if (!String.IsNullOrEmpty(Postfix)) { patternString = patternString.Replace("{DS1}", DataStoreContents[0]); patternString = patternString.Replace("{DS2}", DataStoreContents[1]); patternString = patternString.Replace("{DS3}", DataStoreContents[2]); patternString = patternString.Replace("{DS4}", DataStoreContents[3]); } return patternString; } </code></pre>
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