Improve unit tests assertion messages (#2275)

Using `unittest` assertion methods where possible (since this project doesn't use pytest)
Raise `NotImplementedError` for unimplemented methods
Use `raise AssertionError` instead of `assert 0` (except in `pywin/debugger`, in case that's done on purpose)

Pythonwin/pywin/Demos/openGLDemo.py

@@ -160,10 +160,10 @@ def _DestroyContexts(self):
 
     # The methods to support OpenGL
     def DrawScene(self):
-        assert 0, "You must override this method"
+        raise NotImplementedError("You must override this method")
 
     def Init(self):
-        assert 0, "You must override this method"
+        raise NotImplementedError("You must override this method")
 
     def OnSizeChange(self, cx, cy):
         pass

Pythonwin/pywin/debugger/debugger.py

@@ -851,7 +851,7 @@ def set_cur_frame(self, frame):
                 self.curindex = index
                 break
         else:
-            assert 0, "Can't find the frame in the stack."
+            assert False, "Can't find the frame in the stack."
         SetInteractiveContext(frame.f_globals, frame.f_locals)
         self.GUIRespondDebuggerData()
         self.ShowCurrentLine()
@@ -931,7 +931,7 @@ def GetDebuggerBar(self, barName):
         for id, klass, float in DebuggerDialogInfos:
             if klass.title == barName:
                 return frame.GetControlBar(id)
-        assert 0, "Can't find a bar of that name!"
+        assert False, "Can't find a bar of that name!"
 
     def GUIRespondDebuggerData(self):
         if not self.inited:  # GUI not inited - no toolbars etc.

Pythonwin/pywin/framework/editor/template.py

@@ -1,6 +1,5 @@
 import os
 
-import pywin.framework.window
 import win32api
 import win32ui
 from pywin.mfc import docview
@@ -19,10 +18,10 @@ def __init__(
         ParentEditorTemplate.__init__(self, res, makeDoc, makeFrame, makeView)
 
     def _CreateDocTemplate(self, resourceId):
-        assert 0, "You must override this"
+        raise NotImplementedError("You must override this")
 
     def CreateWin32uiDocument(self):
-        assert 0, "You must override this"
+        raise NotImplementedError("You must override this")
 
     def GetFileExtensions(self):
         return ".txt", ".py"

Pythonwin/pywin/idle/AutoIndent.py

@@ -262,7 +262,7 @@ def newline_and_indent_event(self, event):
                     else:
                         self.reindent_to(y.compute_backslash_indent())
                 else:
-                    assert 0, "bogus continuation type " + repr(c)
+                    raise ValueError(f"bogus continuation type {c!r}")
                 return "break"
 
             # This line starts a brand new stmt; indent relative to

Pythonwin/pywin/test/test_exe.py

@@ -46,7 +46,7 @@ def setUp(self):
             dst = os.path.dirname(pythonwinexe_path) + os.sep + pydll
             if not os.path.isfile(dst):
                 try:
-                    assert os.path.isfile(src)
+                    self.assertTrue(os.path.isfile(src))
                     print(f"-- symlink {dst!r} -> {src!r}", file=sys.stderr)
                     os.symlink(src, dst)
                 except (OSError, AssertionError) as e:
@@ -62,8 +62,8 @@ def test_exe(self):
             rc = "TIMEOUT"
         with open(self.tfn) as f:
             outs = f.read()
-        assert rc == 0, f"rc is {rc!r}, outs={outs!r}"
-        assert "Success!" in outs, outs
+        self.assertEqual(rc, 0, f"outs={outs!r}")
+        self.assertIn("Success!", outs)
         print("-- test_exe Ok! --", file=sys.stderr)
 
     def tearDown(self):