test.sh: make it work on OS X out of the box

test.sh

 #!/bin/bash
+
+timeout()
+{
+    python -c '
+import subprocess
+import sys
+import time
+
+deadline = time.time() + float(sys.argv[1])
+proc = subprocess.Popen(sys.argv[2:])
+while time.time() < deadline and proc.poll() is None:
+    time.sleep(1.0)
+
+if proc.poll() is not None:
+    if proc.returncode:
+        print
+        print >> sys.stderr, "Command failed:", sys.argv[2:]
+        print
+    sys.exit(proc.returncode)
+proc.terminate()
+print
+print >> sys.stderr, "Timeout! Command was:", sys.argv[2:]
+print
+sys.exit(1)
+    ' "$@"
+}
+
 timeout 05.0 python tests/call_function_test.py
 timeout 05.0 python tests/channel_test.py
 timeout 05.0 python tests/first_stage_test.py