--- a/spec/hglib_spec.lua	Sun Oct 23 18:04:08 2016 +0800
+++ b/spec/hglib_spec.lua	Mon Oct 24 00:41:04 2016 +0800
@@ -111,4 +111,22 @@
 		end
 		client:close()
 	end)
+
+	it('can use runcommand_co to request version', function()
+		local client = hglib.Client.open()
+		local co, err = client:runcommand_co({'version'})
+		assert.is_not_nil(co)
+		assert.are_equal('thread', type(co))
+		assert.are_equal('suspended', coroutine.status(co))
+		assert.is_nil(err)
+		local channels = {}
+		while coroutine.status(co) ~= 'dead' do
+			local status, channel = coroutine.resume(co)
+			assert.is_true(status)
+			table.insert(channels, channel)
+		end
+		client:close()
+		assert.are_equal('o', channels[1])
+		assert.are_equal('r', channels[#channels])
+	end)
 end)