diff --git a/tools/winscope/src/test/common/file.ts b/tools/winscope/src/test/common/file.ts
deleted file mode 100644
index e7de1af6e..000000000
--- a/tools/winscope/src/test/common/file.ts
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * Copyright (C) 2022 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-// This class is needed for testing because Node.js doesn't provide the Web API's File type
-import {Blob} from './blob';
-
-class File extends Blob {
-  constructor(buffer: ArrayBuffer, fileName: string) {
-    super(buffer);
-    this.name = fileName;
-  }
-
-  readonly lastModified: number = 0;
-  readonly name: string;
-  readonly webkitRelativePath: string = '';
-}
-
-export {File};
diff --git a/tools/winscope/src/test/common/blob.ts b/tools/winscope/src/test/common/file_impl.ts
similarity index 72%
rename from tools/winscope/src/test/common/blob.ts
rename to tools/winscope/src/test/common/file_impl.ts
index d0205f97e..8ad842bcf 100644
--- a/tools/winscope/src/test/common/blob.ts
+++ b/tools/winscope/src/test/common/file_impl.ts
@@ -14,16 +14,25 @@
  * limitations under the License.
  */
 
-// This class is needed for testing because Node.js doesn't provide the Web API's Blob type
-class Blob {
-  constructor(buffer: ArrayBuffer) {
-    this.size = buffer.byteLength;
-    this.type = 'application/octet-stream';
+// This class is needed for unit tests because Node.js doesn't provide
+// an implementation of the Web API's File type
+class FileImpl {
+  readonly size: number;
+  readonly type: string;
+  readonly name: string;
+  readonly lastModified: number = 0;
+  readonly webkitRelativePath: string = '';
+  private readonly buffer: ArrayBuffer;
+
+  constructor(buffer: ArrayBuffer, fileName: string) {
     this.buffer = buffer;
+    this.size = this.buffer.byteLength;
+    this.type = 'application/octet-stream';
+    this.name = fileName;
   }
 
   arrayBuffer(): Promise<ArrayBuffer> {
-    return new Promise<ArrayBuffer>((resolve, reject) => {
+    return new Promise<ArrayBuffer>((resolve) => {
       resolve(this.buffer);
     });
   }
@@ -39,10 +48,6 @@ class Blob {
   text(): Promise<string> {
     throw new Error('Not implemented!');
   }
-
-  readonly size: number;
-  readonly type: string;
-  private readonly buffer: ArrayBuffer;
 }
 
-export {Blob};
+export {FileImpl};
diff --git a/tools/winscope/src/test/common/utils.ts b/tools/winscope/src/test/common/utils.ts
index c8cba176e..d7f1e8853 100644
--- a/tools/winscope/src/test/common/utils.ts
+++ b/tools/winscope/src/test/common/utils.ts
@@ -15,14 +15,12 @@
  */
 import * as fs from 'fs';
 import * as path from 'path';
-import {Blob} from './blob';
-import {File} from './file';
+import {FileImpl} from './file_impl';
 
 class CommonTestUtils {
   static async getFixtureFile(filename: string): Promise<File> {
     const buffer = CommonTestUtils.loadFixture(filename);
-    const blob = new Blob(buffer);
-    return new File(await blob.arrayBuffer(), filename);
+    return new FileImpl(buffer, filename) as unknown as File;
   }
 
   static loadFixture(filename: string): ArrayBuffer {