log errors in error handlers

atst/domain/exceptions.py

@@ -27,4 +27,6 @@ class UnauthorizedError(Exception):
 
 
 class UnauthenticatedError(Exception):
-    pass
+    @property
+    def message(self):
+        return str(self)

atst/routes/errors.py

@@ -8,12 +8,14 @@ def make_error_pages(app):
     @app.errorhandler(exceptions.UnauthorizedError)
     # pylint: disable=unused-variable
     def not_found(e):
+        app.logger.error(e.message)
         return render_template("not_found.html"), 404
 
 
     @app.errorhandler(exceptions.UnauthenticatedError)
     # pylint: disable=unused-variable
     def unauthorized(e):
+        app.logger.error(e.message)
         return render_template('unauthorized.html'), 401
 
     return app