add test

pymatching/test.py

@@ -0,0 +1,31 @@
+from multiprocessing import Pool
+
+
+def fun(i):
+    print(i)
+    for j in range(i*10,i*10+10):
+        pass
+    return
+#        print(j,end=',')
+    print()
+
+def test_pool():
+    with Pool(5) as pool:
+        pool.map(fun, range(20))
+
+test_pool()
+
+#result, use pool.map_async() instead
+# see https://stackoverflow.com/questions/33447055/python-multiprocess-pool-how-to-exit-the-script-when-one-of-the-worker-process
+
+
+def main():
+    foo()
+def foo():
+    print('foo')
+    bar()
+
+def bar():
+    print('bar')
+
+main()