Slightly simplify and clarify instrumented code

test/test_git.py

@@ -763,16 +763,13 @@ def test_handle_process_output(self):
         from git.cmd import handle_process_output, safer_popen
 
         expected_line_count = 5002
-        line_counts = [None, 0, 0]
-        lines = [None, [], []]
+        actual_lines = [None, [], []]
 
         def stdout_handler(line):
-            line_counts[1] += 1
-            lines[1].append(line)
+            actual_lines[1].append(line)
 
         def stderr_handler(line):
-            line_counts[2] += 1
-            lines[2].append(line)
+            actual_lines[2].append(line)
 
         cmdline = [
             sys.executable,
@@ -789,8 +786,8 @@ def stderr_handler(line):
 
         handle_process_output(proc, stdout_handler, stderr_handler, finalize_process)
 
-        self.assertEqual(line_counts[1], expected_line_count, repr(lines[1]))
-        self.assertEqual(line_counts[2], expected_line_count, repr(lines[2]))
+        self.assertEqual(len(actual_lines[1]), expected_line_count, repr(actual_lines[1]))
+        self.assertEqual(len(actual_lines[2]), expected_line_count, repr(actual_lines[2]))
 
     def test_execute_kwargs_set_agrees_with_method(self):
         parameter_names = inspect.signature(cmd.Git.execute).parameters.keys()