Add a minimal test; this module would not even import...

Author: amauryfa

pypy/module/_demo/demo.py

@@ -10,7 +10,7 @@
 time_t = rffi_platform.getsimpletype('time_t', '#include <time.h>', rffi.LONG)
 
 eci = ExternalCompilationInfo(includes=['time.h'])
-time = rffi.llexternal('time', [int], time_t,
+time = rffi.llexternal('time', [lltype.Signed], time_t,
                        compilation_info=eci)
 
 def get(space, name):

pypy/module/_demo/test/test_import.py

@@ -26,3 +26,5 @@ def test_startup(self):
         w_demo = space.call(w_import,
                             space.newlist([space.wrap('_demo')]))
         assert _demo.Module.demo_events == ['setup', 'startup']
+
+        assert space.getattr(w_demo, space.wrap('measuretime'))