package/python-whitenoise: new package

The test is using the django integration of whitenoise as it's the most
common setup and allows to model the test case after the django one as
well.

The setup we need to do is a bit more complicated though and follows
the whitenoise getting started documentation [1].

We then request a .css file from the django admin app that is enabled
by default in template project. Due to running django's development
server with --nostatic we ensure that static file handling is taken over
by whitenoise.

[1] https://whitenoise.readthedocs.io/en/stable/django.html

Signed-off-by: Marcus Hoffmann <buildroot@bubu1.eu>
Signed-off-by: Julien Olivain <ju.o@free.fr>

support/testing/tests/package/test_python_whitenoise.py

@@ -0,0 +1,41 @@
+import time
+
+from tests.package.test_python import TestPythonPackageBase
+
+
+class TestPythonPy3Whitenoise(TestPythonPackageBase):
+    __test__ = True
+    config = TestPythonPackageBase.config + \
+        """
+        BR2_PACKAGE_PYTHON3=y
+        BR2_PACKAGE_PYTHON_DJANGO=y
+        BR2_PACKAGE_PYTHON_WHITENOISE=y
+        BR2_PACKAGE_PYTHON3_SQLITE=y
+        """
+
+    def test_run(self):
+        self.login()
+        timeout = 35
+
+        cmd = "cd /opt && /usr/bin/django-admin startproject testsite"
+        self.assertRunOk(cmd, timeout=timeout)
+        # STATIC_ROOT needs to be set for 'collectstatic' to work.
+        self.emulator.run("echo 'STATIC_ROOT = BASE_DIR / \"staticfiles\"' >> /opt/testsite/testsite/settings.py")
+        cmd = "cd /opt/testsite && " + self.interpreter + " ./manage.py collectstatic"
+        self.assertRunOk(cmd, timeout=timeout)
+        # whitenoise docs say it needs to be added directly after SecurityMiddleware, so we do this here with sed.
+        cmd = """sed -i -e /django.middleware.security.SecurityMiddleware/a\\ \\"whitenoise.middleware.WhiteNoiseMiddleware\\",\
+        /opt/testsite/testsite/settings.py"""
+        self.assertRunOk(cmd, timeout=timeout)
+        # --nostatic ensures the builtin django server doesn't serve the static files,
+        # so we can test that whitenoise serves them
+        cmd = "cd /opt/testsite && " + self.interpreter + " ./manage.py runserver --nostatic 0.0.0.0:1234 > /dev/null 2>&1 & "
+        self.assertRunOk(cmd, timeout=timeout)
+        # give some time to setup the server
+        for attempt in range(30 * self.emulator.timeout_multiplier):
+            time.sleep(1)
+            cmd = "wget http://127.0.0.1:1234/static/admin/css/base.css"
+            _, exit_code = self.emulator.run(cmd)
+            if exit_code == 0:
+                break
+        self.assertEqual(exit_code, 0, "Timeout while waiting for django server")