Add rectangle testing

Testing/test_rectangle.cpp

@@ -0,0 +1,32 @@
+#include <rectangle.h>
+
+#define CATCH_CONFIG_MAIN
+#include <catch.hpp>
+
+#include <vector>
+#include <string>
+#include <memory>
+
+SCENARIO( "Test Rectangle" )
+{
+
+  GIVEN( "A Rectangle of known size" )
+  {
+    Rectangle rect( 42, 69 );
+
+    const float expectedArea = 42*69;
+    REQUIRE( rect.area() == expectedArea );
+
+    {
+      INFO( "Check get side functions" )
+      REQUIRE( rect.getSide1() == 42 );
+      REQUIRE( rect.getSide2() == 69 );
+    }
+
+    WHEN( "Rectangle is scaled" )
+    {
+      rect.scale( 2 );
+      REQUIRE( rect.area() == expectedArea*4 );
+    }
+  }  
+}

rectangle.h

@@ -1,4 +1,4 @@
-#include <exception>
+#include <stdexcept>
 
 /** Class to store rectangles.  
   Every rectangle has two numbers which define the side lengths.