Add simple test for volume mounting

tests/volumes.py

@@ -0,0 +1,25 @@
+"""
+Test that volume mounts work when running
+"""
+import os
+import subprocess
+import tempfile
+import time
+
+def test_volume_home():
+    """
+    Validate that you can bind mount a volume onto homedirectory & write to it
+    """
+    ts = str(time.time())
+    with tempfile.TemporaryDirectory() as tmpdir:
+        subprocess.check_call([
+            'repo2docker',
+            '-v', '{}:/home/jovyan'.format(tmpdir),
+            tmpdir,
+            '--',
+            '/bin/bash',
+            '-c', 'echo -n {} > ts'.format(ts)
+        ])
+
+        with open(os.path.join(tmpdir, 'ts')) as f:
+            assert f.read() == ts