Method to sort keys in map.

utils/list.go

@@ -2,6 +2,7 @@ package utils
 
 import (
 	"fmt"
+	"sort"
 )
 
 // StringsIsSubset checks that subset is strict subset of full, and returns
@@ -62,3 +63,15 @@ func StrSliceHasItem(s []string, item string) bool {
 	}
 	return false
 }
+
+// StrMapSortedKeys returns keys of map[string]string sorted
+func StrMapSortedKeys(m map[string]string) []string {
+	keys := make(sort.StringSlice, len(m))
+	i := 0
+	for k := range m {
+		keys[i] = k
+		i++
+	}
+	sort.Strings(keys)
+	return keys
+}

utils/list_test.go

@@ -42,3 +42,8 @@ func (s *ListSuite) TestStrSliceHasIteml(c *C) {
 	c.Check(StrSliceHasItem([]string{"a", "b"}, "b"), Equals, true)
 	c.Check(StrSliceHasItem([]string{"a", "b"}, "c"), Equals, false)
 }
+
+func (s *ListSuite) TestStrMapSortedKeys(c *C) {
+	c.Check(StrMapSortedKeys(map[string]string{}), DeepEquals, []string{})
+	c.Check(StrMapSortedKeys(map[string]string{"x": "1", "a": "3", "y": "4"}), DeepEquals, []string{"a", "x", "y"})
+}