make test_request_preprocessing_early_return more thorough

tests/test_basic.py

@@ -580,9 +580,19 @@ def test_request_preprocessing_early_return():
     evts = []
 
     @app.before_request
-    def before_request():
+    def before_request1():
+        evts.append(1)
+
+    @app.before_request
+    def before_request2():
+        evts.append(2)
         return "hello"
 
+    @app.before_request
+    def before_request3():
+        evts.append(3)
+        return "bye"
+
     @app.route('/')
     def index():
         evts.append('index')
@@ -590,7 +600,7 @@ def test_request_preprocessing_early_return():
 
     rv = app.test_client().get('/').data.strip()
     assert rv == b'hello'
-    assert not evts
+    assert evts == [1, 2]
 
 
 def test_after_request_processing():