fix: isolate in-memory client persistence

device_test.go

@@ -602,6 +602,40 @@ func TestNewDeviceDefaults(t *testing.T) {
 	}
 }
 
+func TestNewDeviceMemoryClientDefaultsToNoCache(t *testing.T) {
+	testServer := newDeviceTestServer(t, loadSpecFixture(t), []string{`{"homelist":[{"id":"10","uid":1}]}`, `{"device_info":[{"did":"a","model":"test.light.v1"}],"has_more":false}`})
+	client, err := NewClientWithAuthData(testAuthData(), WithHTTPClient(testServer.server.Client()))
+	if err != nil {
+		t.Fatal(err)
+	}
+	client.baseURL = testServer.server.URL
+	client.availability = true
+	client.availabilityValid = true
+	client.availabilityAt = time.Now()
+
+	workingDirectory := t.TempDir()
+	previousWorkingDirectory, err := os.Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := os.Chdir(workingDirectory); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		if err := os.Chdir(previousWorkingDirectory); err != nil {
+			t.Errorf("restore working directory: %v", err)
+		}
+	})
+
+	if _, err := NewDevice(context.Background(), client, DeviceSelector{DID: "a"}, WithDeviceDelay(0)); err != nil {
+		t.Fatal(err)
+	}
+	cachePath := filepath.Join(workingDirectory, "test.light.v1.json")
+	if _, err := os.Stat(cachePath); !errors.Is(err, os.ErrNotExist) {
+		t.Fatalf("memory client default cache stat error = %v, want not exist", err)
+	}
+}
+
 func TestDeviceGetSetAndAction(t *testing.T) {
 	testServer := newDeviceTestServer(t, loadSpecFixture(t), []string{
 		`{"homelist":[{"id":"10","uid":1}]}`, `{"device_info":[{"did":"a","name":"Lamp","model":"test.light.v1"}],"has_more":false}`,