add test folder

test/test.py

@@ -0,0 +1,39 @@
+# Generated by Selenium IDE
+import pytest
+import time
+import json
+import os
+from selenium import webdriver
+from selenium.webdriver.chrome.options import Options
+from selenium.webdriver.common.by import By
+from selenium.webdriver.common.action_chains import ActionChains
+from selenium.webdriver.support import expected_conditions
+from selenium.webdriver.support.wait import WebDriverWait
+from selenium.webdriver.common.keys import Keys
+from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
+
+class test_widget():
+  def setup_method(self, method):
+    options = Options()
+    cwd = os.getcwd()
+    options.add_experimental_option("prefs", {"download.default_directory": cwd})
+    self.driver = webdriver.Chrome(options=options)
+    self.vars = {}
+
+  def teardown_method(self, method):
+    self.driver.quit()
+
+  def download_widget_image(self):
+    self.driver.get("http://localhost:8383/voila/render/example.ipynb")
+    self.driver.set_window_size(1280, 720)
+    time.sleep(3)
+    self.driver.save_screenshot("widget-01.png")
+    self.driver.execute_script("window.scrollTo(0, 1000)")
+    time.sleep(3)
+    self.driver.save_screenshot("widget-02.png")
+
+test = test_widget()
+test.setup_method('Chrome')
+test.download_widget_image()
+test.teardown_method('Chrome')
+

test/test_figures.py

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+from PIL import Image, ImageChops, ImageStat
+
+image1 = Image.open('widget-01.png')
+image2 = Image.open('test/widget-sample.png')
+
+diff = ImageChops.difference(image1, image2)
+stat = ImageStat.Stat(diff)
+
+if sum(stat.mean) == 0:
+  print('images are the same')
+else:
+  raise Exception("The result is NOT the same as expected. Please check matplotlib version.")