# All files / testing compare-headers.ts

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     /**
     * @license
     * Copyright 2019 Google Inc.
     *
     * 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.
     */

    import { AssertionError, expect } from 'chai';

    // Trick TS since it's set to target ES5.
    declare class HeadersWithEntries extends Headers {
      entries?(): Iterable<[string, string]>;
    }

    // Chai doesn't check if Headers objects contain the same entries,
    // so we need to do that manually.
    export function compareHeaders(
      expectedHeaders: HeadersWithEntries,
      actualHeaders: HeadersWithEntries
    ): void {
      if (
        expectedHeaders.entries === undefined ||
        actualHeaders.entries === undefined
      ) {
        throw new AssertionError('Headers object does not have entries method');
      }

      const expected = new Map(Array.from(expectedHeaders.entries()));
      const actual = new Map(Array.from(actualHeaders.entries()));
      expect(actual).to.deep.equal(expected);
    }