Function createToHaveReturnedWithMatcher

packages/expect/src/spyMatchers.ts:679–758

()

  };

const createToHaveReturnedWithMatcher = (): MatcherFunction<[unknown]> =>
  function (received: any, expected): SyncExpectationResult {
    const expectedArgument = 'expected';
    const options: MatcherHintOptions = {
      isNot: this.isNot,
      promise: this.promise,
    };
    ensureMock(received, 'toHaveReturnedWith', expectedArgument, options);

    const receivedName = received.getMockName();
    const {calls, results} = received.mock;

    const pass = results.some((result: any) => isEqualReturn(expected, result));

    const message = pass
      ? () => {
          // Some examples of results that are equal to expected value.
          const indexedResults: Array<IndexedResult> = [];
          let i = 0;
          while (i < results.length && indexedResults.length < PRINT_LIMIT) {
            if (isEqualReturn(expected, results[i])) {
              indexedResults.push([i, results[i]]);
            }
            i += 1;
          }

          return (
            // eslint-disable-next-line prefer-template
            matcherHint(
              'toHaveReturnedWith',
              receivedName,
              expectedArgument,
              options,
            ) +
            '\n\n' +
            `Expected: not ${printExpected(expected)}\n` +
            (results.length === 1 &&
            results[0].type === 'return' &&
            stringify(results[0].value) === stringify(expected)
              ? ''
              : printReceivedResults(
                  'Received:     ',
                  expected,
                  indexedResults,
                  results.length === 1,
                )) +
            printNumberOfReturns(countReturns(results), calls.length)
          );
        }
      : () => {
          // Some examples of results that are not equal to expected value.
          const indexedResults: Array<IndexedResult> = [];
          let i = 0;
          while (i < results.length && indexedResults.length < PRINT_LIMIT) {
            indexedResults.push([i, results[i]]);
            i += 1;
          }