List check utils.

utils/list_test.go

@@ -0,0 +1,16 @@
+package utils
+
+import (
+	. "launchpad.net/gocheck"
+)
+
+type ListSuite struct {
+}
+
+func (s *ListSuite) TestStringsIsSubset(c *C) {
+	err := StringsIsSubset([]string{"a", "b"}, []string{"a", "b", "c"}, "[%s]")
+	c.Assert(err, IsNil)
+
+	err = StringsIsSubset([]string{"b", "a"}, []string{"b", "c"}, "[%s]")
+	c.Assert(err, ErrorMatches, "[a]")
+}