fix empty queries

tfstate/lookup.go

@@ -207,7 +207,7 @@ func (s *TFState) Lookup(key string) (*Object, error) {
 	var foundName string
 	for name, ins := range s.scanned {
 		if strings.HasPrefix(key, name) {
-			// logest match
+			// longest match
 			if len(foundName) < len(name) {
 				found = ins
 				foundName = name
@@ -219,6 +219,9 @@ func (s *TFState) Lookup(key string) (*Object, error) {
 	}
 
 	query := strings.TrimPrefix(key, foundName)
+	if query == "" {
+		query = "." // empty query means the whole object
+	}
 	if strings.HasPrefix(query, "[") { // e.g. output.foo[0]
 		query = "." + query
 	}

tfstate/lookup_test.go

@@ -186,14 +186,16 @@ var TestSuitesOK = []TestSuite{
 
 func testLookupState(t *testing.T, state *tfstate.TFState) {
 	for _, ts := range TestSuitesOK {
-		res, err := state.Lookup(ts.Key)
-		if err != nil {
-			t.Error(err)
-		}
-		t.Log(ts.Key, res)
-		if diff := cmp.Diff(res.Value, ts.Result); diff != "" {
-			t.Errorf("%s unexpected result %s", ts.Key, diff)
-		}
+		t.Run(ts.Key, func(t *testing.T) {
+			res, err := state.Lookup(ts.Key)
+			if err != nil {
+				t.Error(err)
+			}
+			t.Log(ts.Key, res)
+			if diff := cmp.Diff(res.Value, ts.Result); diff != "" {
+				t.Errorf("%s unexpected result %s", ts.Key, diff)
+			}
+		})
 	}
 }