Added more tests to String Indexing task, plus a couple of refactorings

Author: sofiiako

Strings/Concatenation/tests/test_task.py

@@ -20,4 +20,5 @@ def test_statement_1(self):
         with open("concatenation.py", "r") as taskfile:
             lines = taskfile.readlines()
             code = lines[-2]
-            self.assertTrue("+" in code, msg="Your solution does not use concatenation.")
+            if not ("+" in code):
+                self.fail(msg="Your solution does not use string concatenation.")

Strings/String indexing/tests/test_task.py

@@ -10,5 +10,16 @@ def test_indexing(self):
         except ImportError:
             self.assertTrue(False, msg="Do not rename any variables.")
 
+    def test_0_code_len(self):
+        with open("string_indexing.py", "r") as taskfile:
+            lines = taskfile.readlines()
+            self.assertTrue(len(lines) == 5, msg="Please do not add or remove any lines from the code file.")
+
+    def test_statement_1(self):
+        with open("string_indexing.py", "r") as taskfile:
+            lines = taskfile.readlines()
+            code = lines[-2]
+            if not ("[0]" in code):
+                self.fail(msg="Your solution does not use string indexing.")
 
 

Strings/String multiplication/tests/test_task.py

@@ -19,4 +19,5 @@ def test_statement_1(self):
         with open("string_multiplication.py", "r") as taskfile:
             lines = taskfile.readlines()
             code = lines[-2]
-            self.assertTrue("*" in code, msg="Your solution does not use string multiplication.")
+            if not ("*" in code):
+                self.fail(msg="Your solution does not use string multiplication.")