--- a/spec/hglib_spec.lua	Fri Sep 16 10:40:32 2016 +0800
+++ b/spec/hglib_spec.lua	Fri Sep 16 15:50:07 2016 +0800
@@ -19,7 +19,7 @@
 
 describe('hglib client', function()
 	it('can connect using just file handles', function()
-		local rh = io.open('spec/data/hello', 'rb')
+		local rh = assert(io.open('spec/data/hello', 'rb'))
 		local client = hglib.Client.connect(rh, nil)
 		client:close()
 		assert.are_equal('closed file', io.type(rh))