/**
 * Copyright 2020 Google LLC
 *
 * 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.
 */ /**
 * Defines the mock wrapper for selectively mocking methods on an object.
 */ export interface MockWrapper < T extends ( ... args : any [ ] ) => any > { original : T ; implementation : T ; restore : ( ) => void ; } param target param functionName param implementation export function mock < TTarget , TFunction extends jest . FunctionPropertyNames < Required < TTarget > > > ( target , functionName , implementation ) ; export function mock < T > ( target , functionName , implementation ) ; export function mock < T > ( target , functionName , implementation ) { const obj = target ; const original = obj [ functionName ] as unknown as ( ... args : any [ ] ) => any ; obj [ functionName ] = implementation as any ; function restore ( ) { obj [ functionName ] = original as any ; } return { original , implementation , restore , } ; } param timeout export function wait ( timeout ) { return new Promise ( resolve => setTimeout ( resolve , timeout ) ) ; }