diff --git a/filter_test.go b/filter_test.go
index b16f1ce..0b536a9 100644
--- a/filter_test.go
+++ b/filter_test.go
@@ -43,3 +43,51 @@ func TestFilterSelection(t *testing.T) {
 		t.Errorf("Expected 1 node, found %v.", len(sel3.Nodes))
 	}
 }
+
+func TestNot(t *testing.T) {
+	sel := Doc().Find(".span12").Not(".alert")
+	if len(sel.Nodes) != 1 {
+		t.Errorf("Expected 1 node, found %v.", len(sel.Nodes))
+	}
+}
+
+func TestNotNone(t *testing.T) {
+	sel := Doc().Find(".span12").Not(".zzalert")
+	if len(sel.Nodes) != 2 {
+		t.Errorf("Expected 2 nodes, found %v.", len(sel.Nodes))
+	}
+}
+
+func TestNotFunction(t *testing.T) {
+	sel := Doc().Find(".pvk-content").NotFunction(func(i int, s *Selection) bool {
+		return i > 0
+	})
+	if len(sel.Nodes) != 1 {
+		t.Errorf("Expected 1 nodes, found %v.", len(sel.Nodes))
+	}
+}
+
+func TestNotNode(t *testing.T) {
+	sel := Doc().Find(".pvk-content")
+	sel2 := sel.NotNodes(sel.Nodes[2])
+	if len(sel2.Nodes) != 2 {
+		t.Errorf("Expected 2 nodes, found %v.", len(sel2.Nodes))
+	}
+}
+
+func TestNotSelection(t *testing.T) {
+	sel := Doc().Find(".link")
+	sel2 := Doc().Find("a[ng-click]")
+	sel3 := sel.NotSelection(sel2)
+	if len(sel3.Nodes) != 6 {
+		t.Errorf("Expected 6 nodes, found %v.", len(sel3.Nodes))
+	}
+}
+
+func TestUnion(t *testing.T) {
+	sel := Doc().Find(".pvk-gutter")
+	sel2 := Doc().Find("div").Union(sel)
+	if len(sel2.Nodes) != 6 {
+		t.Errorf("Expected 6 nodes, found %v.", len(sel2.Nodes))
+	}
+}