func TestResourceProvider_refresh(t *testing.T) {
	p := new(terraform.MockResourceProvider)
	client, server := testClientServer(t)
	name, err := Register(server, p)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	provider := &ResourceProvider{Client: client, Name: name}

	p.RefreshReturn = &terraform.InstanceState{
		ID: "bob",
	}

	// Refresh
	info := &terraform.InstanceInfo{}
	state := &terraform.InstanceState{}
	newState, err := provider.Refresh(info, state)
	if !p.RefreshCalled {
		t.Fatal("refresh should be called")
	}
	if !reflect.DeepEqual(p.RefreshState, state) {
		t.Fatalf("bad: %#v", p.RefreshState)
	}
	if err != nil {
		t.Fatalf("bad: %#v", err)
	}
	if !reflect.DeepEqual(p.RefreshReturn, newState) {
		t.Fatalf("bad: %#v", newState)
	}
}