more test cleanup

Author: alexcjohnson

package.json

@@ -24,7 +24,7 @@
     "postbuild": "es-check es5 dash_html_components/*.js",
     "build:watch": "watch 'npm run build' src",
     "test:import": "python -m unittest tests.test_dash_import",
-    "test:py": "pytest --nopercyfinalize tests/test_dash_html_components.py tests/test_integration.py",
+    "test:py": "pytest --nopercyfinalize --headless tests/test_dash_html_components.py tests/test_integration.py",
     "test": "run-s -c test:py test:import lint"
   },
   "author": "Chris Parmer <chris@plotly.com>",

tests/IntegrationTests.py

@@ -6,7 +6,7 @@
 import dash_html_components as html
 
 
-def test_click(dash_duo):
+def test_click_simple(dash_duo):
     call_count = Value('i', 0)
 
     app = dash.Dash(__name__)
@@ -36,6 +36,8 @@ def update_output(n_clicks):
     assert call_count.value == 2
     dash_duo.percy_snapshot('button click')
 
+    assert not dash_duo.get_logs()
+
 
 def test_click_prev(dash_duo):
     call_count = Value('i', 0)
@@ -93,3 +95,5 @@ def update_output(*args):
     assert timestamp_2.value > timestamp_1.value
     assert call_count.value == 4
     dash_duo.percy_snapshot('button-2 click again')
+
+    assert not dash_duo.get_logs()