Added tearDown method to the test suites.

test.nim

@@ -10,9 +10,11 @@ testSuite UnitTests:
     self.assertTrue(self.testObj == 400)
 
   method setup()=
-    self.testObj = 5
     self.testObj = 90
 
+  method tearDown()=
+    self.testObj = 0
+
   method testForB()=
     var b = 0
     self.doThings()
@@ -29,9 +31,11 @@ testSuite UnitTestsNew:
     testObj: int
 
   method setup()=
-    self.testObj = 5
     self.testObj = 90
 
+  method tearDown()=
+    self.testObj = 0
+
   method testTestObj()=
     self.assertTrue(self.testObj == 90)
 
@@ -76,6 +80,11 @@ testSuite MoreInheritance of TestInherit:
     # fail. This is expected.
     self.testObj = 12345
 
+  method tearDown()=
+    # Calling the direct parent's tearDown method
+    self.tearDownTestInherit()
+    self.testObj = 0
+
   method testTestObj()=
     # This method is overwritten. To call the base method,
     # simply use