tests/io/resource_stream: Add test for uio.resource_stream().

tests/io/resource_stream.py

+import uio
+import sys
+
+try:
+    uio.resource_stream
+except AttributeError:
+    print('SKIP')
+    sys.exit()
+
+try:
+    buf = uio.resource_stream("data", "file2")
+except NotImplementedError:
+    pass
+
+# resource_stream(None, ...) look ups from current dir, hence sys.path[0] hack
+buf = uio.resource_stream(None, sys.path[0] + "/data/file2")
+print(buf.read())

tests/io/resource_stream.py.exp

+1234