merge testing GH workflows; small test cleanup

.github/workflows/screenshot-comparison.yml

@@ -1,4 +1,4 @@
-name: screenshot comparison
+name: Screenshot comparison
 
 on:
   push:
@@ -31,19 +31,28 @@ jobs:
         pip install --upgrade voila
         pip install --upgrade voila-osscar-template
         pip install -e .
+        pip install --upgrade selenium
+        pip install --upgrade Pillow
 
     - name: Run the voila server
       run: |
         voila --template=osscar --enable_nbextensions=True example/ --port 8383 --no-browser &
-        pip install --upgrade pytest
-        pip install --upgrade selenium
-        pip install --upgrade Pillow
 
     - uses: nanasess/setup-chromedriver@master
-    - run: |
+    - name: Generate the screenshots
+      run: |
         export DISPLAY=:99
         chromedriver --url-base=/wd/hub &
         sudo Xvfb -ac :99 -screen 0 1280x1024x24 > /dev/null 2>&1 & # optional
         python3 $GITHUB_WORKSPACE/test/test.py
+    
+    - name: Upload screenshots
+      uses: actions/upload-artifact@v4
+      with:
+        name: artifact
+        path: './*.png'
+
+    - name: Compare the screenshots to the reference one
+      run: |
         python3 $GITHUB_WORKSPACE/test/test_figures.py
 

test/test.py

@@ -1,16 +1,12 @@
 # Generated by Selenium IDE
-import pytest
-import time
-import json
 import os
+import time
+
 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):

test/test_figures.py

@@ -7,6 +7,6 @@
 stat = ImageStat.Stat(diff)
 
 if sum(stat.mean) == 0:
-  print('images are the same')
+  print('Images are the same!')
 else:
-  raise Exception("The result is NOT the same as expected. Please check matplotlib version.")
+  raise Exception("The result is NOT the same as expected.")