command/refresh: test the -out flag

command/refresh_test.go

@@ -66,3 +66,81 @@ func TestRefresh(t *testing.T) {
 		t.Fatalf("bad: %#v", actual)
 	}
 }
+
+func TestRefresh_outPath(t *testing.T) {
+	// Write out some prior state
+	tf, err := ioutil.TempFile("", "tf")
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	statePath := tf.Name()
+	defer os.Remove(tf.Name())
+
+	// Output path
+	outf, err := ioutil.TempFile("", "tf")
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+	outPath := outf.Name()
+	outf.Close()
+	os.Remove(outPath)
+
+	state := &terraform.State{}
+
+	err = terraform.WriteState(state, tf)
+	tf.Close()
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	p := testProvider()
+	ui := new(cli.MockUi)
+	c := &RefreshCommand{
+		TFConfig: testTFConfig(p),
+		Ui:       ui,
+	}
+
+	p.RefreshFn = nil
+	p.RefreshReturn = &terraform.ResourceState{ID: "yes"}
+
+	args := []string{
+		"-out", outPath,
+		statePath,
+		testFixturePath("refresh"),
+	}
+	if code := c.Run(args); code != 0 {
+		t.Fatalf("bad: %d\n\n%s", code, ui.ErrorWriter.String())
+	}
+
+	f, err := os.Open(statePath)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	newState, err := terraform.ReadState(f)
+	f.Close()
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if !reflect.DeepEqual(newState, state) {
+		t.Fatalf("bad: %#v", newState)
+	}
+
+	f, err = os.Open(outPath)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	newState, err = terraform.ReadState(f)
+	f.Close()
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	actual := newState.Resources["test_instance.foo"]
+	expected := p.RefreshReturn
+	if !reflect.DeepEqual(actual, expected) {
+		t.Fatalf("bad: %#v", actual)
+	}
+}