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testUtils.sinon.stub( window, 'FileReader' ).callsFake( () => {
nativeReaderMock = new NativeFileReaderMock();
return nativeReaderMock;
} );
sinon.stub( window, 'FileReader' ).callsFake( () => {
nativeReaderMock = new NativeFileReaderMock();
return nativeReaderMock;
} );