helper/resource: basic tests

helper/resource/map.go

@@ -2,6 +2,7 @@ package resource
 
 import (
 	"fmt"
+	"sort"
 
 	"github.com/hashicorp/terraform/terraform"
 )
@@ -87,8 +88,14 @@ func (m *Map) Refresh(
 // resource map and can be used to satisfy the Resources method of
 // a ResourceProvider.
 func (m *Map) Resources() []terraform.ResourceType {
-	rs := make([]terraform.ResourceType, 0, len(m.Mapping))
+	ks := make([]string, 0, len(m.Mapping))
 	for k, _ := range m.Mapping {
+		ks = append(ks, k)
+	}
+	sort.Strings(ks)
+
+	rs := make([]terraform.ResourceType, 0, len(m.Mapping))
+	for _, k := range ks {
 		rs = append(rs, terraform.ResourceType{
 			Name: k,
 		})

helper/resource/map_test.go

@@ -1 +1,32 @@
 package resource
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/hashicorp/terraform/terraform"
+)
+
+func TestMapResources(t *testing.T) {
+	m := &Map{
+		Mapping: map[string]Resource{
+			"aws_elb":      Resource{},
+			"aws_instance": Resource{},
+		},
+	}
+
+	rts := m.Resources()
+
+	expected := []terraform.ResourceType{
+		terraform.ResourceType{
+			Name: "aws_elb",
+		},
+		terraform.ResourceType{
+			Name: "aws_instance",
+		},
+	}
+
+	if !reflect.DeepEqual(rts, expected) {
+		t.Fatalf("bad: %#v", rts)
+	}
+}