add aborter object to app

tests/test_helpers.py

@@ -2,6 +2,7 @@ import io
 import os
 
 import pytest
+import werkzeug.exceptions
 
 import flask
 from flask.helpers import get_debug_flag
@@ -174,6 +175,35 @@ def test_redirect_with_app(app):
         flask.redirect("other")
 
 
+def test_abort_no_app():
+    with pytest.raises(werkzeug.exceptions.Unauthorized):
+        flask.abort(401)
+
+    with pytest.raises(LookupError):
+        flask.abort(900)
+
+
+def test_app_aborter_class():
+    class MyAborter(werkzeug.exceptions.Aborter):
+        pass
+
+    class MyFlask(flask.Flask):
+        aborter_class = MyAborter
+
+    app = MyFlask(__name__)
+    assert isinstance(app.aborter, MyAborter)
+
+
+def test_abort_with_app(app):
+    class My900Error(werkzeug.exceptions.HTTPException):
+        code = 900
+
+    app.aborter.mapping[900] = My900Error
+
+    with app.app_context(), pytest.raises(My900Error):
+        flask.abort(900)
+
+
 class TestNoImports:
     """Test Flasks are created without import.