Add a single test project and set to build on travis/appveyor

run_tests.py

@@ -0,0 +1,20 @@
+from __future__ import print_function
+import os, sys, subprocess
+from glob import glob
+
+# move cwd to the project root
+os.chdir(os.path.dirname(os.path.abspath(__file__)))
+
+test_projects = glob('test/??_*')
+
+if len(test_projects) == 0:
+    print('No test projects found. Aborting.', file=sys.stderr)
+    exit(2)
+
+print('Testing projects:', test_projects)
+
+for project_path in test_projects:
+    subprocess.check_call(['cibuildwheel', project_path])
+    print('%s built successfully.' % project_path)
+
+print('%d projects built successfully.' % len(test_projects))