before_render_template signal

tests/test_signals.py

@@ -46,6 +46,30 @@ def test_template_rendered():
     finally:
         flask.template_rendered.disconnect(record, app)
 
+def test_before_render_template():
+    app = flask.Flask(__name__)
+
+    @app.route('/')
+    def index():
+        return flask.render_template('simple_template.html', whiskey=42)
+
+    recorded = []
+
+    def record(sender, template, context):
+        context['whiskey'] = 43
+        recorded.append((template, context))
+
+    flask.before_render_template.connect(record, app)
+    try:
+        rv = app.test_client().get('/')
+        assert len(recorded) == 1
+        template, context = recorded[0]
+        assert template.name == 'simple_template.html'
+        assert context['whiskey'] == 43
+        assert rv.data == b'<h1>43</h1>'
+    finally:
+        flask.before_render_template.disconnect(record, app)
+
 def test_request_signals():
     app = flask.Flask(__name__)
     calls = []