node: remove test which doesn't do a lot (ethereum#29159)

* node: fix test if directory already exists

* node: remove test

node/node_test.go

@@ -415,21 +415,6 @@ func TestRegisterHandler_Successful(t *testing.T) {
 	assert.Equal(t, "success", string(buf))
 }
 
-// Tests that the given handler will not be successfully mounted since no HTTP server
-// is enabled for RPC
-func TestRegisterHandler_Unsuccessful(t *testing.T) {
-	node, err := New(&DefaultConfig)
-	if err != nil {
-		t.Fatalf("could not create new node: %v", err)
-	}
-
-	// create and mount handler
-	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.Write([]byte("success"))
-	})
-	node.RegisterHandler("test", "/test", handler)
-}
-
 // Tests whether websocket requests can be handled on the same port as a regular http server.
 func TestWebsocketHTTPOnSamePort_WebsocketRequest(t *testing.T) {
 	node := startHTTP(t, 0, 0)