allow tests to run in headless mode in CI

Author: rmorshea

.github/workflows/test.yml

@@ -32,4 +32,4 @@ jobs:
         run: |
           npm install -g npm@latest
           npm --version
-          nox -s test
+          nox -s test -- --headless

noxfile.py

@@ -39,7 +39,7 @@ def format(session: Session) -> None:
 def test(session: Session) -> None:
     """Run the complete test suite"""
     session.install("--upgrade", "pip", "setuptools", "wheel")
-    session.notify("test_suite")
+    session.notify("test_suite", posargs=session.posargs)
     session.notify("test_style")
 
 
@@ -51,6 +51,7 @@ def test_suite(session: Session) -> None:
 
     session.chdir(HERE / "tests")
     session.env["IDOM_DEBUG_MODE"] = "1"
+    session.env["SELENIUM_HEADLESS"] = str(int("--headless" in session.posargs))
     session.run("python", "manage.py", "build_js")
     session.run("python", "manage.py", "test")
 

tests/test_app/tests.py

@@ -1,3 +1,5 @@
+import os
+
 from channels.testing import ChannelsLiveServerTestCase
 from selenium import webdriver
 from selenium.webdriver.support.ui import WebDriverWait
@@ -27,7 +29,9 @@ def test_counter(self):
 
 
 def make_driver(page_load_timeout, implicit_wait_timeout):
-    driver = webdriver.Chrome()
+    options = webdriver.ChromeOptions()
+    options.headless = bool(int(os.environ.get("SELENIUM_HEADLESS", 0)))
+    driver = webdriver.Chrome(options=options)
     driver.set_page_load_timeout(page_load_timeout)
     driver.implicitly_wait(implicit_wait_timeout)
     return driver