only dump courses to neo4j if they've been updated since the last time they were dumped

improvements to the command line interface for caching

openedx/core/djangoapps/coursegraph/tests/test_signals.py

@@ -0,0 +1,27 @@
+"""
+Tests for coursegraph's signal handler on course publish
+"""
+from __future__ import unicode_literals
+
+from opaque_keys.edx.keys import CourseKey
+
+from openedx.core.djangoapps.coursegraph.signals import _listen_for_course_publish
+from openedx.core.djangoapps.coursegraph.utils import CourseLastPublishedCache
+from openedx.core.djangolib.testing.utils import CacheIsolationTestCase
+
+
+class TestCourseGraphSignalHandler(CacheIsolationTestCase):
+    """
+    Tests for the course publish course handler
+    """
+    ENABLED_CACHES = ['default']
+
+    def test_cache_set_on_course_publish(self):
+        """
+        Tests that the last published cache is set on course publish
+        """
+        course_key = CourseKey.from_string('course-v1:org+course+run')
+        last_published_cache = CourseLastPublishedCache()
+        self.assertIsNone(last_published_cache.get(course_key))
+        _listen_for_course_publish(None, course_key)
+        self.assertIsNotNone(last_published_cache.get(course_key))