diff --git a/application/src/main/java/run/halo/app/core/attachment/endpoint/LocalAttachmentUploadHandler.java b/application/src/main/java/run/halo/app/core/attachment/endpoint/LocalAttachmentUploadHandler.java
index 6b2f2233a..047ee012f 100644
--- a/application/src/main/java/run/halo/app/core/attachment/endpoint/LocalAttachmentUploadHandler.java
+++ b/application/src/main/java/run/halo/app/core/attachment/endpoint/LocalAttachmentUploadHandler.java
@@ -317,7 +317,6 @@ class LocalAttachmentUploadHandler implements AttachmentHandler {
             return Optional.empty();
         }
         var uriStr = annotations.get(Constant.URI_ANNO_KEY);
-        // the uriStr is encoded before.
         var uri = UriComponentsBuilder.fromUri(externalUrl.get())
             // The URI has been encoded before, so there is no need to encode it again.
             .path(uriStr)
diff --git a/application/src/test/java/run/halo/app/core/attachment/endpoint/LocalAttachmentUploadHandlerTest.java b/application/src/test/java/run/halo/app/core/attachment/endpoint/LocalAttachmentUploadHandlerTest.java
index cd3972028..126390219 100644
--- a/application/src/test/java/run/halo/app/core/attachment/endpoint/LocalAttachmentUploadHandlerTest.java
+++ b/application/src/test/java/run/halo/app/core/attachment/endpoint/LocalAttachmentUploadHandlerTest.java
@@ -7,6 +7,7 @@ import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.junit.jupiter.params.provider.Arguments.arguments;
 import static org.mockito.Mockito.when;
 
+import java.net.URI;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Path;
 import java.time.Clock;
@@ -34,6 +35,7 @@ import run.halo.app.core.extension.attachment.Attachment;
 import run.halo.app.core.extension.attachment.Policy;
 import run.halo.app.core.extension.attachment.endpoint.UploadOption;
 import run.halo.app.extension.ConfigMap;
+import run.halo.app.infra.ExternalUrlSupplier;
 
 @ExtendWith(MockitoExtension.class)
 class LocalAttachmentUploadHandlerTest {
@@ -44,6 +46,9 @@ class LocalAttachmentUploadHandlerTest {
     @Mock
     AttachmentRootGetter attachmentRootGetter;
 
+    @Mock
+    ExternalUrlSupplier externalUrlSupplier;
+
     @TempDir
     Path tempDir;
 
@@ -52,6 +57,7 @@ class LocalAttachmentUploadHandlerTest {
     @BeforeEach
     void setUp() {
         uploadHandler.setClock(clock);
+        when(externalUrlSupplier.get()).thenReturn(URI.create("/"));
     }
 
     public static Stream<Arguments> testUploadWithRenameStrategy() {
diff --git a/application/src/test/java/run/halo/app/core/endpoint/theme/ThumbnailEndpointTest.java b/application/src/test/java/run/halo/app/core/endpoint/theme/ThumbnailEndpointTest.java
index 5446b2ceb..f0375bd6e 100644
--- a/application/src/test/java/run/halo/app/core/endpoint/theme/ThumbnailEndpointTest.java
+++ b/application/src/test/java/run/halo/app/core/endpoint/theme/ThumbnailEndpointTest.java
@@ -1,6 +1,5 @@
 package run.halo.app.core.endpoint.theme;
 
-import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.when;
 
 import java.net.URI;
@@ -13,6 +12,7 @@ import org.mockito.junit.jupiter.MockitoExtension;
 import org.springframework.test.web.reactive.server.WebTestClient;
 import reactor.core.publisher.Mono;
 import run.halo.app.core.attachment.ThumbnailService;
+import run.halo.app.core.attachment.ThumbnailSize;
 
 /**
  * Tests for {@link ThumbnailEndpoint}.
@@ -39,13 +39,12 @@ class ThumbnailEndpointTest {
 
     @Test
     void thumbnailUriNotAccessible() {
-        when(thumbnailService.get(any(), any()))
-            .thenReturn(Mono.just(URI.create("/thumbnail-not-found.png")));
+        when(thumbnailService.get(URI.create("/myavatar.png"), ThumbnailSize.L))
+            .thenReturn(Mono.empty());
         webClient.get()
             .uri("/thumbnails/-/via-uri?size=l&uri=/myavatar.png")
             .exchange()
-            .expectAll(responseSpec -> responseSpec.expectHeader().location("/myavatar.png"))
-            .expectStatus()
-            .is3xxRedirection();
+            .expectHeader().location("/myavatar.png")
+            .expectStatus().is3xxRedirection();
     }
 }
diff --git a/application/src/test/java/run/halo/app/theme/finders/impl/ThumbnailFinderImplTest.java b/application/src/test/java/run/halo/app/theme/finders/impl/ThumbnailFinderImplTest.java
index 64048b216..8cfdc526d 100644
--- a/application/src/test/java/run/halo/app/theme/finders/impl/ThumbnailFinderImplTest.java
+++ b/application/src/test/java/run/halo/app/theme/finders/impl/ThumbnailFinderImplTest.java
@@ -2,7 +2,6 @@ package run.halo.app.theme.finders.impl;
 
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.never;
-import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;