add Index() methods

array_test.go

@@ -93,3 +93,39 @@ func TestGetInvalid(t *testing.T) {
 	sel := doc.Find(".pvk-content")
 	sel.Get(129)
 }
+
+func TestIndex(t *testing.T) {
+	sel := doc.Find(".pvk-content")
+	if i := sel.Index(); i != 1 {
+		t.Errorf("Expected index of 1, got %v.", i)
+	}
+}
+
+func TestIndexSelector(t *testing.T) {
+	sel := doc.Find(".hero-unit")
+	if i := sel.IndexSelector("div"); i != 4 {
+		t.Errorf("Expected index of 4, got %v.", i)
+	}
+}
+
+func TestIndexOfNode(t *testing.T) {
+	sel := doc.Find("div.pvk-gutter")
+	if i := sel.IndexOfNode(sel.Nodes[1]); i != 1 {
+		t.Errorf("Expected index of 1, got %v.", i)
+	}
+}
+
+func TestIndexOfNilNode(t *testing.T) {
+	sel := doc.Find("div.pvk-gutter")
+	if i := sel.IndexOfNode(nil); i != -1 {
+		t.Errorf("Expected index of -1, got %v.", i)
+	}
+}
+
+func TestIndexOfSelection(t *testing.T) {
+	sel := doc.Find("div")
+	sel2 := doc.Find(".hero-unit")
+	if i := sel.IndexOfSelection(sel2); i != 4 {
+		t.Errorf("Expected index of 4, got %v.", i)
+	}
+}