BAsic test of demo and server intialization.

This needs more work. I exit the server by hacking serve_forever to
raise a KeyboardInterrupt. Otherwise the test just hangs.

I need a replacement that exits after one (or more configurable)
connections and some way to background the server so the test can
make the connections to the running server instance.

Author: rouilj

test/test_demo.py

@@ -0,0 +1,64 @@
+import unittest
+import os, sys, shutil
+
+from roundup.demo import install_demo, run_demo
+
+import roundup.scripts.roundup_server
+
+# https://stackoverflow.com/questions/4219717/how-to-assert-output-with-nosetest-unittest-in-python
+# lightly modified
+from contextlib import contextmanager
+_py3 = sys.version_info[0] > 2
+if _py3:
+    from io import StringIO # py3
+else:
+    from StringIO import StringIO # py2
+@contextmanager
+def captured_output():
+    new_out, new_err = StringIO(), StringIO()
+    old_out, old_err = sys.stdout, sys.stderr
+    try:
+        sys.stdout, sys.stderr = new_out, new_err
+        yield sys.stdout, sys.stderr
+    finally:
+        sys.stdout, sys.stderr = old_out, old_err
+
+class TestDemo(unittest.TestCase):
+    def setUp(self):
+        self.home = os.path.abspath('_test_demo')
+
+    def tearDown(self):
+        try:
+            shutil.rmtree(self.home)
+        except FileNotFoundError:
+            pass
+        
+    def testDemo(self):
+        with captured_output() as (out, err):
+            install_demo(self.home, 'anydbm', 'classic')
+        output = out.getvalue().strip()
+        print(output)
+
+        # dummy up the return of get_server so the serve_forever method
+        # raises keyboard interrupt exiting the server so the test exits.
+        gs = roundup.scripts.roundup_server.ServerConfig.get_server
+        def raise_KeyboardInterrupt():
+            raise KeyboardInterrupt
+
+        def test_get_server(self):
+            httpd = gs(self)
+            httpd.serve_forever = raise_KeyboardInterrupt
+            return httpd
+
+        roundup.scripts.roundup_server.ServerConfig.get_server = test_get_server
+
+        # Run under context manager to capture output of startup text.
+        with captured_output() as (out, err):
+            run_demo(self.home)
+        output = out.getvalue().strip()
+        print(output)
+        # if the server installed and started this will be the
+        # last line in the output.
+        self.assertIn("Keyboard Interrupt: exiting", output.split('\n'))
+
+