Add some test support and a test for issue 6

requirements-dev.txt

 pytest
+psutil
+bs4

tests/t_sidebar.py

+PORT = 8000
+
+from bs4 import BeautifulSoup as Soup
+import subprocess
+import pytest 
+import psutil
+import requests
+
+site_rebuilt = False
+@pytest.fixture
+def rebuild_site():
+    """We only want to rebuid the site once and only if bin/serve isn't already
+    automaritcally rebuilding it."""
+
+    # Use a global to keep state between runs because I couldn't figure out how
+    # to decorate a closure as a pytest.fixture.
+    global site_rebuilt
+
+    if not site_rebuilt:
+
+        # Check if automatic rebuilder already running
+        for pid in psutil.pids():
+            p = psutil.Process(pid)
+            if p.name() == "pelican" and p.cmdline()[-1] == "PELICAN_BINSERVE=true":
+                site_rebuilt = True
+                return True
+
+        # Do the rebuild by running our build script
+        out = subprocess.check_output("build").decode("utf-8")
+        print(out)
+        site_rebuilt = True
+
+    return site_rebuilt
+ 
+def fetch(url, just_contents=True):
+    res = requests.get(f'http://localhost:{PORT}/{url}')
+    if just_contents:
+        return res.content.decode('utf-8')
+    return res
+
+def test_recent_post_sidebar_link(rebuild_site):
+    # test index page
+    soup = Soup(fetch(''), 'html.parser')
+    for rec in [l for l in soup.find(id="recent-posts").find_all('a')]:
+        print(rec['href'])
+        assert(rec['href'].startswith('/'))
+
+    # test article page
+    soup = Soup(fetch('2019/10/commoditization'), 'html.parser')
+    for rec in [l for l in soup.find(id="recent-posts").find_all('a')]:
+        assert(rec['href'].startswith('/'))
+