terraform: passing test for destroy edge for module only

Just adding passing tests as a sanity check for a bug.

terraform/test-fixtures/transform-destroy-edge-module-only/child/main.tf

@@ -0,0 +1,8 @@
+resource "aws_instance" "a" {}
+resource "aws_instance" "b" {
+    value = "${aws_instance.a.id}"
+}
+
+resource "aws_instance" "c" {
+    value = "${aws_instance.b.id}"
+}

terraform/test-fixtures/transform-destroy-edge-module-only/main.tf

@@ -0,0 +1,3 @@
+module "child" {
+    source = "./child"
+}

terraform/transform_attach_state.go

@@ -45,12 +45,11 @@ func (t *AttachStateTransformer) Transform(g *Graph) error {
 		}
 
 		// Attach the first resource state we get
-		log.Printf("SEARCH: %s", addr)
 		found := false
 		for _, result := range results {
 			if rs, ok := result.Value.(*ResourceState); ok {
 				log.Printf(
-					"[DEBUG] Attaching resource state to %q: %s",
+					"[DEBUG] Attaching resource state to %q: %#v",
 					dag.VertexName(v), rs)
 				an.AttachResourceState(rs)
 				found = true

terraform/transform_destroy_edge_test.go

@@ -96,6 +96,32 @@ func TestDestroyEdgeTransformer_module(t *testing.T) {
 	}
 }
 
+func TestDestroyEdgeTransformer_moduleOnly(t *testing.T) {
+	g := Graph{Path: RootModulePath}
+	g.Add(&graphNodeDestroyerTest{AddrString: "module.child.aws_instance.a"})
+	g.Add(&graphNodeDestroyerTest{AddrString: "module.child.aws_instance.b"})
+	g.Add(&graphNodeDestroyerTest{AddrString: "module.child.aws_instance.c"})
+	tf := &DestroyEdgeTransformer{
+		Module: testModule(t, "transform-destroy-edge-module-only"),
+	}
+	if err := tf.Transform(&g); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	actual := strings.TrimSpace(g.String())
+	expected := strings.TrimSpace(`
+module.child.aws_instance.a (destroy)
+  module.child.aws_instance.b (destroy)
+  module.child.aws_instance.c (destroy)
+module.child.aws_instance.b (destroy)
+  module.child.aws_instance.c (destroy)
+module.child.aws_instance.c (destroy)
+`)
+	if actual != expected {
+		t.Fatalf("bad:\n\n%s", actual)
+	}
+}
+
 type graphNodeCreatorTest struct {
 	AddrString string
 	Refs       []string