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% Document Info
\author{Sérgio Ferreira (AlienEngineer)}
\pdfinfo{
  /Title (c-unit-tests-advanced.pdf)
  /Creator (Cheatography)
  /Author (Sérgio Ferreira (AlienEngineer))
  /Subject (C\# Unit-Tests - Advanced Cheat Sheet)
}

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    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
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    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{C\# Unit-Tests - Advanced Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Sérgio Ferreira (AlienEngineer)} via \textcolor{DarkBackground}{\uline{cheatography.com/89520/cs/20391/}}}
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  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}Sérgio Ferreira (AlienEngineer) \\
  \uline{cheatography.com/alienengineer} \\
  \end{tabulary}
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 28th August, 2019.\\
   Updated 3rd September, 2019.\\
   Page {\thepage} of \pageref{LastPage}.
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  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
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\begin{multicols*}{2}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{\{\{fa-bolt\}\} Implementation testing}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{public void Test() \{ \newline   // Arrange \newline   var mock = new Mock\textless{}IActionInterface\textgreater{}(); \newline   var subject = new MySubject(mock.Object); \newline     \newline   // Act \newline   subject.DoSomething(); \newline   \newline   // Assert \newline   mock.Verify(e =\textgreater{} e.Store(It.IsAny\textless{}int\textgreater{}()), Times.Once); \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{- Locks tests with the dependency: \newline ~~- The test method is aware of IActionInterface. \newline ~~- Creates duplicated code. \newline - Changes to MySubject constructor forces changes throughout all the tests.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
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\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{\{\{fa-info-circle\}\} Verify vs Callbacks}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{// If one of these equality comparisons fail we just know that MyAction wasn't called with those arguments. \newline mock.Verify(e =\textgreater{}  e.MyAction( \newline   It.Is\textless{}ParameterType\textgreater{}(param =\textgreater{} \newline     param.Field1 == "some value" \&\&  \newline     param.Field2 == 3), \newline   Times.Once); \newline  \newline // Instead: \newline ParameterType calledArgs = null; \newline mock \newline   .Setup(e =\textgreater{} e.MyAction(It.IsAny\textless{}ParameterType\textgreater{}())) \newline   .Callback\textless{}ParameterType\textgreater{}(param =\textgreater{} calledArgs = param); \newline  \newline Assert.That(calledArgs, Is.Not.Null); \newline Assert.That(calledArgs.Field1, Is.EqualTo("some value")); \newline Assert.That(calledArgs.Field2, Is.EqualTo(3));} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Tip}}: Avoid stating in your tests how things were done, instead strive to describe what happened. {\bf{Observable Behavior}}}  \tn 
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\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{\{\{fa-thumbs-up\}\} Behavior testing}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{private int \_someVariable; \newline   \newline private MySubject MakeSubject() \newline \{ \newline   var mock = new Mock\textless{}IActionInterface\textgreater{}(); \newline   \newline   mock.Setup(e =\textgreater{} e.Action(It.IsAny\textless{}int\textgreater{}())) \newline       .Callback\textless{}Int\textgreater{}(s =\textgreater{} \_someVariable= s); \newline   \newline   return new MySubject(mock.Object); \newline \} \newline   \newline private bool WasStored(int value) =\textgreater{}  \newline   \_someVariable == value; \newline   \newline {[}Test{]} \newline public void SomeTestMethod() \newline \{ \newline   // Arrange \newline   var subject = MakeSubject(); \newline   \newline   // Act \newline   subject.DoSomething(); \newline   \newline   // Assert \newline   \seqsplit{Assert.True(WasStored(5));} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\mymulticolumn{1}{x{8.4cm}}{- Changes to dependencies are done in one place only. \newline - Focuses on Behavior not implementation.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\begin{tabularx}{8.4cm}{X}
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\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{\{\{fa-bolt\}\} Dependencies - Common missed tests}}  \tn
% Row 0
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\mymulticolumn{1}{x{8.4cm}}{{\emph{What happens when the dependency..}}} \tn 
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\mymulticolumn{1}{x{8.4cm}}{\{\{fa-minus\}\} throws exception?} \tn 
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\mymulticolumn{1}{x{8.4cm}}{\{\{fa-minus\}\} returns wrong format? (e.g. expected json)} \tn 
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\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\mymulticolumn{1}{x{8.4cm}}{{\bf{Tip}}: Testing is about making sure we have answers to questions. Testing is done when we don't have doubts, therefore no more questions.}  \tn 
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\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{\{\{fa-info-circle\}\} Web Apis}}  \tn
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\mymulticolumn{1}{x{8.4cm}}{internal abstract class WebApiTests \{ \newline   private WebApplicationFactory\textless{}Startup\textgreater{} \_factory;\{\{nl\}\} \newline   protected WebApiTests() =\textgreater{}  \newline     \_factory = new WebApplicationFactory\textless{}Startup\textgreater{}();\{\{nl\}\} \newline   protected HttpClient GetClient() =\textgreater{}  \newline     \seqsplit{\_factory.CreateClient();} \newline \} \newline  \newline class MyApiControllerTests : WebApiTests \{ \newline  \newline   public async Task requestTest() \{ \newline     // Arrange \newline     var client = GetClient();\{\{nl\}\} \newline  \newline     // Act \newline     var response = await client.GetAsync("api/someuri");\{\{nl\}\} \newline  \newline     // Assert \newline     \seqsplit{response.EnsureSuccessStatusCode();} \newline     var data = await response.Content.ReadAsAsync\textless{}Model\textgreater{}();\{\{nl\}\} \newline  \newline     // Assert data ... \newline   \} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\mymulticolumn{1}{x{8.4cm}}{using {\bf{Microsoft.AspNetCore.Mvc.Testing}} library for auto mocking out the http layer.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{\{\{fa-thumbs-up\}\} Files}}  \tn
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\mymulticolumn{1}{x{8.4cm}}{// Hide file access through Stream Factory \newline public interface IStreamFactory \newline \{ \newline   Stream OpenStream(); \newline   void CloseStream(Stream stream); \newline \} \newline  \newline // On test file \newline private IStreamFactory MakeStreamStorage() \newline \{ \newline   // Create one isolated MemoryStream per test run! \newline   \_stream = new MemoryStream(); \newline   var mock = new Mock\textless{}IStreamFactory\textgreater{}(); \newline   mock.Setup(s =\textgreater{} \seqsplit{s.OpenStream()).Returns(\_stream);} \newline   return mock.Object; \newline \}} \tn 
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\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{\{\{fa-bolt\}\} Test arrange with files}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{void Test() \{ \newline   // slow \& can fail \newline   var data = \seqsplit{File.ReadAllText(@"Data.json");} \newline   // slow \& can fail \newline   var x = JsonConvert.DeserializeObject\textless{}MyModel\textgreater{}(data); \newline  \newline   // None of the above lines have anything to do with the test. It's all about Arrange section. \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\mymulticolumn{1}{x{8.4cm}}{{\bf{Tip}}: If you feel the need to do this, probably your subject under test is doing to much. See {\bf{Don't ignore the signs!}}}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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% That's all folks
\end{multicols*}

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