Add simple functional tests for docker

.travis.yml

@@ -1,3 +1,6 @@
+jobs:
+  include:
+    - stage: test supported Python versions
       sudo: false
       language: python
       python:
@@ -19,3 +22,10 @@ script:
       branches:
         except:
           - standalone
+
+    - stage: test Docker image
+      sudo: required
+      services:
+        - docker
+      scirpt:
+        - bin/test-docker.sh

bin/test-docker.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env sh
+
+# Perform some simple validation to make sure the Docker image works
+# Should be run from the repo root.
+
+set -xe  # exit on any error, show debug output
+
+docker build . -t pypiserver:test
+
+docker run pypiserver:test --help
+
+CONTAINER_ID=$(docker run -d -p 8080:8080 pypiserver:test)
+
+sleep 5  # give the contaienr some time to get going
+
+# Ensure our home page is returning something
+curl localhost:8080 | grep -q "pypiserver"
+
+docker container stop "$CONTAINER_ID"