Added test suite based on nosetests. Closes #27.

tests/test_fixed_source/test_fixed_source.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+
+import os
+from subprocess import Popen, STDOUT, PIPE
+
+pwd = os.path.dirname(__file__)
+
+def setup(): 
+    os.putenv('PWD', pwd)
+    os.chdir(pwd)
+
+def test_run():
+    proc = Popen([pwd + '/../../src/openmc'], stderr=STDOUT, stdout=PIPE)
+    returncode = proc.wait()
+    print(proc.communicate()[0])
+    assert returncode == 0
+
+def test_created_statepoint():
+    assert os.path.exists(pwd + '/statepoint.10.binary')
+
+def teardown():
+    output = [pwd + '/statepoint.10.binary']
+    for f in output:
+        if os.path.exists(f):
+            os.remove(f)