add code coverage slides

.gitignore

@@ -30,3 +30,5 @@ cabal.config
 html
 latex
 *.class
+.cache
+.coverage

Tutorials/T05-PyUnit/slides/Unit Testing.tex

@@ -367,6 +367,10 @@ class TestCircles:
 \end{itemize}
 \end{frame}
 
+
+% -----------------------------------------------------
+\section{Code Coverage}
+% -----------------------------------------------------
 \begin{frame}[fragile]
 \frametitle{How much should I test?}
 \begin{itemize}
@@ -379,14 +383,41 @@ class TestCircles:
 \begin{frame}[fragile]
 \frametitle{Code Coverage}
 \begin{itemize}
-	\item {}
+\item{Function coverage: has each function (or subroutine) in the program been called?}
+\item{Statement coverage: has each statement in the program been executed?}
 \end{itemize}
 \end{frame}
 
+\begin{frame}[fragile]
+\frametitle{Code Coverage}
+\begin{itemize}
+\item{Branch coverage: has each branch of each control structure (such as in if and case statements) been executed?}
+	\begin{itemize}
+		\item{For example, given an if statement, have both the true and false branches been executed?}
+		\item{Another way of saying this is, has every edge in the program been executed?}
+	\end{itemize}
+\item{Condition coverage (or predicate coverage): has each Boolean sub-expression evaluated both to true and false?}
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]
+\frametitle{Pytest plugin for measuring coverage}
+	\begin{itemize}
+		\item{\url{https://pypi.python.org/pypi/pytest-cov}}
+		\item{You can install it via pip: \texttt{pip install pytest-cov}}
+		\item{Then, in the source code directory, run \texttt{pytest --cov}}
+	\end{itemize}
+	\begin{figure}[b]
+		{\includegraphics[width=8cm]{test-coverage}}
+	\end{figure}
+\end{frame}
+
+
 \begin{frame}[fragile]
 \frametitle{Documentation on pytest}
 \begin{itemize}
 	\item {\url{https://docs.pytest.org/en/latest/xunit_setup.html}}
+	\item {\url{https://en.wikipedia.org/wiki/Code_coverage}}
 \end{itemize}
 \end{frame}
 

Tutorials/T05-PyUnit/src/test_statistics.py

-import unittest
+import pytest
 from Statistics import *
 
-class StatisticsTests(unittest.TestCase):
+class TestStatistics():
 
-    def setUp(self):
+    def setup_method(self):
         c1 = CircleT(1,0,2)
         c2 = CircleT(-3,-5,5.25)
         c3 = CircleT(-2,5,10)
@@ -12,17 +12,14 @@ class StatisticsTests(unittest.TestCase):
 
         self.circles = [c1,c2,c3,c4,c5]
 
-    def tearDown(self):
+    def teardown_method(self):
         self.circles = None
 
     def testAverageOfCircles(self):
-        self.assertAlmostEqual(average(self.circles), 2000000003.45,  None, None, 0.1)
+        assert average(self.circles) == pytest.approx(2000000003.45, rel=0.1)
 
     def test_rank(self):
-        self.assertTrue(rank(self.circles) == [4,3,2,5,1])
+        assert rank(self.circles) == [4,3,2,5,1]
 
     def test_stdDev(self):
-        self.assertAlmostEqual(stdDev(self.circles), 3999999998.275, None, None, 0.1)
-
-if __name__ == '__main__':
-    unittest.main()
+        assert stdDev(self.circles) == pytest.approx(3999999998.275, rel=0.1)