Function buildError

packages/private/testing/matchers/index.ts:102–113

(isNot: boolean)

      return {compare: buildError(false), negativeCompare: buildError(true)};

      function buildError(isNot: boolean) {
        return function (actual: any, className: string) {
          return {
            pass: hasClass(actual, className) == !isNot,
            get message() {
              return `Expected ${actual.outerHTML} ${
                isNot ? 'not ' : ''
              }to contain the CSS class "${className}"`;
            },
          };
        };
      }
    },

    toHaveCssStyle: function () {