@hirez_io/auto-spies-core/src/errors/error-handler.ts

Create automatic spies from classes in tests, also for promises and observables, used as a common code for jasmine-auto-spies and jest-auto-spies

import { stringify } from 'javascript-stringify';

export const errorHandler = {
  throwArgumentsError(actualArgs: any[], functionName: string): void {
    let errorMessage = `
              The function '${functionName}' was configured with
              'mustBeCalledWith' and expects to be called with specific arguments.
              -
              `;
    if (!actualArgs || actualArgs.length === 0) {
      errorMessage += `
              But the function was called without any arguments
              `;
    } else {
      let formattedArgs = stringify(actualArgs);
      /* istanbul ignore next */
      formattedArgs = formattedArgs?.substring(1, formattedArgs.length - 1);

      errorMessage += `
              But the actual arguments were: ${formattedArgs}
              `;
    }

    throw new Error(errorMessage);
  },
};