reflect review comments

store/storetest/link_metadata_store.go

@@ -107,7 +107,8 @@ func testLinkMetadataStoreSave(t *testing.T, ss store.Store) {
 		require.NoError(t, err)
 		assert.Equal(t, &model.PostImage{}, linkMetadata.Data)
 
-		metadata.Data = &model.PostImage{Height: 10, Width: 20}
+		newData := &model.PostImage{Height: 10, Width: 20}
+		metadata.Data = newData
 
 		linkMetadata, err = ss.LinkMetadata().Save(metadata)
 		require.NoError(t, err)
@@ -116,7 +117,7 @@ func testLinkMetadataStoreSave(t *testing.T, ss store.Store) {
 		// Should return the original result, not the duplicate one
 		linkMetadata, err = ss.LinkMetadata().Get(metadata.URL, metadata.Timestamp)
 		require.NoError(t, err)
-		assert.NotEqual(t, &model.PostImage{}, linkMetadata.Data)
+		assert.Equal(t, newData, linkMetadata.Data)
 	})
 }