diff --git a/video/video_stream_encoder_unittest.cc b/video/video_stream_encoder_unittest.cc
index 267169a2f2..aed619db26 100644
--- a/video/video_stream_encoder_unittest.cc
+++ b/video/video_stream_encoder_unittest.cc
@@ -67,6 +67,7 @@ using ::testing::Lt;
 using ::testing::Matcher;
 using ::testing::NiceMock;
 using ::testing::Return;
+using ::testing::SizeIs;
 using ::testing::StrictMock;
 
 namespace {
@@ -4122,6 +4123,44 @@ TEST_F(VideoStreamEncoderTest,
   video_stream_encoder_->Stop();
 }
 
+TEST_F(VideoStreamEncoderTest,
+       ReportsUpdatedVideoLayersAllocationWhenResolutionChanges) {
+  ResetEncoder("VP8", /*num_streams*/ 2, 1, 1, /*screenshare*/ false,
+               VideoStreamEncoderSettings::BitrateAllocationCallbackType::
+                   kVideoLayersAllocation);
+
+  video_stream_encoder_->OnBitrateUpdatedAndWaitForManagedResources(
+      DataRate::BitsPerSec(kSimulcastTargetBitrateBps),
+      DataRate::BitsPerSec(kSimulcastTargetBitrateBps),
+      DataRate::BitsPerSec(kSimulcastTargetBitrateBps), 0, 0, 0);
+
+  video_source_.IncomingCapturedFrame(
+      CreateFrame(CurrentTimeMs(), codec_width_, codec_height_));
+  WaitForEncodedFrame(CurrentTimeMs());
+  EXPECT_EQ(sink_.number_of_layers_allocations(), 1);
+  ASSERT_THAT(sink_.GetLastVideoLayersAllocation().active_spatial_layers,
+              SizeIs(2));
+  EXPECT_EQ(sink_.GetLastVideoLayersAllocation().active_spatial_layers[1].width,
+            codec_width_);
+  EXPECT_EQ(
+      sink_.GetLastVideoLayersAllocation().active_spatial_layers[1].height,
+      codec_height_);
+
+  video_source_.IncomingCapturedFrame(
+      CreateFrame(CurrentTimeMs(), codec_width_ / 2, codec_height_ / 2));
+  WaitForEncodedFrame(CurrentTimeMs());
+  EXPECT_EQ(sink_.number_of_layers_allocations(), 2);
+  ASSERT_THAT(sink_.GetLastVideoLayersAllocation().active_spatial_layers,
+              SizeIs(2));
+  EXPECT_EQ(sink_.GetLastVideoLayersAllocation().active_spatial_layers[1].width,
+            codec_width_ / 2);
+  EXPECT_EQ(
+      sink_.GetLastVideoLayersAllocation().active_spatial_layers[1].height,
+      codec_height_ / 2);
+
+  video_stream_encoder_->Stop();
+}
+
 TEST_F(VideoStreamEncoderTest, TemporalLayersNotDisabledIfSupported) {
   // 2 TLs configured, temporal layers supported by encoder.
   const int kNumTemporalLayers = 2;