diff --git a/src/plugins/fresco/__tests__/index.node.js b/src/plugins/fresco/__tests__/index.node.js
new file mode 100644
index 000000000..15cfaa534
--- /dev/null
+++ b/src/plugins/fresco/__tests__/index.node.js
@@ -0,0 +1,259 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+
+import FrescoPlugin from '../index.js';
+import type {PersistedState, ImageEventWithId} from '../index.js';
+
+function mockPersistedState(
+  imageSizes: Array<{
+    width: number,
+    height: number,
+  }>,
+  viewport: {
+    width: number,
+    height: number,
+  },
+): PersistedState {
+  const scanDisplayTime = {};
+  scanDisplayTime[1] = 3;
+  const events: Array<ImageEventWithId> = [
+    {
+      imageIds: [...Array(imageSizes.length).keys()].map(String),
+      eventId: 0,
+      attribution: [],
+      startTime: 1,
+      endTime: 2,
+      source: 'source',
+      coldStart: true,
+      viewport: {...viewport, scanDisplayTime},
+    },
+  ];
+
+  const imagesMap = imageSizes.reduce((acc, val, index) => {
+    acc[index] = {
+      imageId: String(index),
+      width: val.width,
+      height: val.height,
+      sizeBytes: 10,
+      data: undefined,
+    };
+    return acc;
+  }, {});
+
+  return {
+    surfaceList: new Set(),
+    images: [],
+    events,
+    imagesMap,
+    closeableReferenceLeaks: [],
+  };
+}
+
+test('the metric reducer for the input having regression', () => {
+  const persistedState = mockPersistedState(
+    [
+      {
+        width: 150,
+        height: 150,
+      },
+      {
+        width: 150,
+        height: 150,
+      },
+      {
+        width: 150,
+        height: 150,
+      },
+    ],
+    {
+      width: 100,
+      height: 100,
+    },
+  );
+  expect(FrescoPlugin.metricsReducer).toBeDefined();
+  //$FlowFixMe: Added a check if the metricsReducer exists in FrescoPlugin
+  const metrics = FrescoPlugin.metricsReducer(persistedState);
+  expect(metrics).resolves.toMatchObject({
+    WASTED_BYTES: 37500,
+    CLOSEABLE_REFERENCE_LEAKS: 0,
+  });
+});
+
+test('the metric reducer for the input having no regression', () => {
+  const persistedState = mockPersistedState(
+    [
+      {
+        width: 50,
+        height: 10,
+      },
+      {
+        width: 50,
+        height: 50,
+      },
+      {
+        width: 50,
+        height: 50,
+      },
+    ],
+    {
+      width: 100,
+      height: 100,
+    },
+  );
+  const metricsReducer = FrescoPlugin.metricsReducer;
+  expect(metricsReducer).toBeDefined();
+  //$FlowFixMe: Added a check if the metricsReducer exists in FrescoPlugin
+  const metrics = metricsReducer(persistedState);
+  expect(metrics).resolves.toMatchObject({
+    WASTED_BYTES: 0,
+    CLOSEABLE_REFERENCE_LEAKS: 0,
+  });
+});
+
+test('the metric reducer for the default persisted state', () => {
+  const metricsReducer = FrescoPlugin.metricsReducer;
+  expect(metricsReducer).toBeDefined();
+  //$FlowFixMe: Added a check if the metricsReducer exists in FrescoPlugin
+  const metrics = metricsReducer(FrescoPlugin.defaultPersistedState);
+  expect(metrics).resolves.toMatchObject({
+    WASTED_BYTES: 0,
+    CLOSEABLE_REFERENCE_LEAKS: 0,
+  });
+});
+
+test('the metric reducer with the events data but with no imageData in imagesMap ', () => {
+  const persistedState = mockPersistedState(
+    [
+      {
+        width: 50,
+        height: 10,
+      },
+      {
+        width: 50,
+        height: 50,
+      },
+      {
+        width: 50,
+        height: 50,
+      },
+    ],
+    {
+      width: 100,
+      height: 100,
+    },
+  );
+  persistedState.imagesMap = {};
+  const metricsReducer = FrescoPlugin.metricsReducer;
+  expect(metricsReducer).toBeDefined();
+  //$FlowFixMe: Added a check if the metricsReducer exists in FrescoPlugin
+  const metrics = metricsReducer(persistedState);
+  expect(metrics).resolves.toMatchObject({
+    WASTED_BYTES: 0,
+    CLOSEABLE_REFERENCE_LEAKS: 0,
+  });
+});
+
+test('the metric reducer with the no viewPort data in events', () => {
+  const persistedState = mockPersistedState(
+    [
+      {
+        width: 50,
+        height: 10,
+      },
+      {
+        width: 50,
+        height: 50,
+      },
+      {
+        width: 50,
+        height: 50,
+      },
+    ],
+    {
+      width: 100,
+      height: 100,
+    },
+  );
+  delete persistedState.events[0].viewport;
+  const metricsReducer = FrescoPlugin.metricsReducer;
+  expect(metricsReducer).toBeDefined();
+  //$FlowFixMe: Added a check if the metricsReducer exists in FrescoPlugin
+  const metrics = metricsReducer(persistedState);
+  expect(metrics).resolves.toMatchObject({
+    WASTED_BYTES: 0,
+    CLOSEABLE_REFERENCE_LEAKS: 0,
+  });
+});
+
+test('the metric reducer with the multiple events', () => {
+  const scanDisplayTime = {};
+  scanDisplayTime[1] = 3;
+  const events: Array<ImageEventWithId> = [
+    {
+      imageIds: ['0', '1'],
+      eventId: 0,
+      attribution: [],
+      startTime: 1,
+      endTime: 2,
+      source: 'source',
+      coldStart: true,
+      viewport: {width: 100, height: 100, scanDisplayTime},
+    },
+    {
+      imageIds: ['2', '3'],
+      eventId: 1,
+      attribution: [],
+      startTime: 1,
+      endTime: 2,
+      source: 'source',
+      coldStart: true,
+      viewport: {width: 50, height: 50, scanDisplayTime},
+    },
+  ];
+  const imageSizes = [
+    {
+      width: 150,
+      height: 150,
+    },
+    {
+      width: 100,
+      height: 100,
+    },
+    {
+      width: 250,
+      height: 250,
+    },
+    {
+      width: 300,
+      height: 300,
+    },
+  ];
+  const imagesMap = imageSizes.reduce((acc, val, index) => {
+    acc[index] = {
+      imageId: String(index),
+      width: val.width,
+      height: val.height,
+      sizeBytes: 10,
+      data: undefined,
+    };
+    return acc;
+  }, {});
+  const persistedState = {
+    surfaceList: new Set(),
+    images: [],
+    events,
+    imagesMap,
+  };
+  const metricsReducer = FrescoPlugin.metricsReducer;
+  expect(metricsReducer).toBeDefined();
+  //$FlowFixMe: Added a check if the metricsReducer exists in FrescoPlugin
+  const metrics = metricsReducer(persistedState);
+  expect(metrics).resolves.toMatchObject({
+    WASTED_BYTES: 160000,
+    CLOSEABLE_REFERENCE_LEAKS: 0,
+  });
+});
diff --git a/src/plugins/fresco/index.js b/src/plugins/fresco/index.js
index 47a4962a1..92198c82b 100644
--- a/src/plugins/fresco/index.js
+++ b/src/plugins/fresco/index.js
@@ -33,7 +33,7 @@ import ImagePool from './ImagePool.js';
 
 export type ImageEventWithId = ImageEvent & {eventId: number};
 
-type PersistedState = {
+export type PersistedState = {
   surfaceList: Set<string>,
   images: ImagesList,
   events: Array<ImageEventWithId>,
@@ -157,28 +157,27 @@ export default class extends FlipperPlugin<PluginState, *, PersistedState> {
     persistedState: PersistedState,
   ): Promise<MetricType> => {
     const {events, imagesMap, closeableReferenceLeaks} = persistedState;
+
     const wastedBytes = (events || []).reduce((acc, event) => {
       const {viewport, imageIds} = event;
       if (!viewport) {
         return acc;
       }
-      return (
-        acc +
-        imageIds.reduce((innerAcc, imageID) => {
-          const imageData: ImageData = imagesMap[imageID];
-          if (!imageData) {
-            return innerAcc;
-          }
-          const imageWidth: number = imageData.width;
-          const imageHeight: number = imageData.height;
-          const viewPortWidth: number = viewport.width;
-          const viewPortHeight: number = viewport.height;
-          const viewPortArea = viewPortWidth * viewPortHeight;
-          const imageArea = imageWidth * imageHeight;
-          return innerAcc + Math.max(0, imageArea - viewPortArea);
-        }, acc)
-      );
+      return imageIds.reduce((innerAcc, imageID) => {
+        const imageData: ImageData = imagesMap[imageID];
+        if (!imageData) {
+          return innerAcc;
+        }
+        const imageWidth: number = imageData.width;
+        const imageHeight: number = imageData.height;
+        const viewPortWidth: number = viewport.width;
+        const viewPortHeight: number = viewport.height;
+        const viewPortArea = viewPortWidth * viewPortHeight;
+        const imageArea = imageWidth * imageHeight;
+        return innerAcc + Math.max(0, imageArea - viewPortArea);
+      }, acc);
     }, 0);
+
     return Promise.resolve({
       WASTED_BYTES: wastedBytes,
       CLOSEABLE_REFERENCE_LEAKS: (closeableReferenceLeaks || []).length,