Add cachedResult method to TestCase

src/unittest_extensions/case.py

@@ -43,7 +43,8 @@ def result(self) -> Any:
         decorator.
         """
         try:
-            return self.subject(**self._subjectKwargs)
+            self._subject_result = self.subject(**self._subjectKwargs)
+            return self._subject_result
         except TypeError as e:
             msg = e.args[0]
             if "unexpected keyword argument" in msg:
@@ -60,6 +61,14 @@ def result(self) -> Any:
                 )
             raise e
 
+    def cachedResult(self) -> Any:
+        """
+        Return the result of the last `subject` call.
+        Use this function if when you to assert different attributes of your
+        subject without executing it multiple times.
+        """
+        return self._subject_result
+
     def assertResult(self, value):
         """
         Fail if the result is unequal to the value as determined by the '=='

src/unittest_extensions/tests/test_use_case.py

@@ -123,3 +123,15 @@ def test_change_state(self):
     def test_change_state_twice(self):
         self.assertResult(2)
         self.assertResult(3)
+
+    def test_change_state_cached_result(self):
+        self.result()
+        self.assertEqual(self.cachedResult(), 2)
+        self.result()
+        self.assertEqual(self.cachedResult(), 3)
+
+    def test_manually_change_state_cached_result(self):
+        self.result()
+        self.assertEqual(self.cachedResult(), 2)
+        self.instance.state_var += 1
+        self.assertEqual(self.cachedResult(), 2)