add tests for docs 'demo.py'

Author: samuelcolvin

tests/test_doc_example.py

@@ -0,0 +1,17 @@
+from importlib.machinery import SourceFileLoader
+from pathlib import Path
+
+THIS_DIR = Path(__file__).parent
+
+
+async def test_run_job_burst(redis_conn, loop, caplog):
+    demo = SourceFileLoader('demo', str(THIS_DIR / '../docs/demo.py')).load_module()
+    worker = demo.Worker(burst=True, loop=loop)
+
+    downloader = demo.Downloader(loop=loop)
+
+    await downloader.download_content('http://example.com')
+    await worker.run()
+    await downloader.close()
+    assert 's → Downloader.download_content(http://example.com)' in caplog
+    assert 's ← Downloader.download_content ● 1' in caplog