set TEMPLATE_AUTO_RELOAD default value to None

tests/test_templating.py

@@ -296,12 +296,36 @@ def test_iterable_loader():
     assert rv.data == b'<h1>Jameson</h1>'
 
 def test_templates_auto_reload():
+    # debug is False, config option is None
     app = flask.Flask(__name__)
-    assert app.config['TEMPLATES_AUTO_RELOAD']
-    assert app.jinja_env.auto_reload
+    assert app.debug is False
+    assert app.config['TEMPLATES_AUTO_RELOAD'] is None
+    assert app.jinja_env.auto_reload is False
+    # debug is False, config option is False
     app = flask.Flask(__name__)
     app.config['TEMPLATES_AUTO_RELOAD'] = False
-    assert not app.jinja_env.auto_reload
+    assert app.debug is False
+    assert app.jinja_env.auto_reload is False
+    # debug is False, config option is True
+    app = flask.Flask(__name__)
+    app.config['TEMPLATES_AUTO_RELOAD'] = True
+    assert app.debug is False
+    assert app.jinja_env.auto_reload is True
+    # debug is True, config option is None
+    app = flask.Flask(__name__)
+    app.config['DEBUG'] = True
+    assert app.config['TEMPLATES_AUTO_RELOAD'] is None
+    assert app.jinja_env.auto_reload is True
+    # debug is True, config option is False
+    app = flask.Flask(__name__)
+    app.config['DEBUG'] = True
+    app.config['TEMPLATES_AUTO_RELOAD'] = False
+    assert app.jinja_env.auto_reload is False
+    # debug is True, config option is True
+    app = flask.Flask(__name__)
+    app.config['DEBUG'] = True
+    app.config['TEMPLATES_AUTO_RELOAD'] = True
+    assert app.jinja_env.auto_reload is True
 
 def test_template_loader_debugging(test_apps):
     from blueprintapp import app