Fix pretty print for closeTo matcher

CHANGELOG.md

@@ -79,6 +79,7 @@
 - `[@jest/reporters]` Move missing icon file which is needed for `NotifyReporter` class. ([#12593](https://github.com/facebook/jest/pull/12593))
 - `[jest-resolver]` Call custom resolver with core node.js modules ([#12654](https://github.com/facebook/jest/pull/12654))
 - `[jest-worker]` Fix `Farm` execution results memory leak ([#12497](https://github.com/facebook/jest/pull/12497))
+- `[pretty-format]` Fix print for the `closeTo` matcher ([#12626](https://github.com/facebook/jest/pull/12626))
 
 ### Chore & Maintenance
 

packages/expect/src/asymmetricMatchers.ts

@@ -13,6 +13,7 @@ import {
   subsetEquality,
 } from '@jest/expect-utils';
 import * as matcherUtils from 'jest-matcher-utils';
+import {pluralize} from 'jest-util';
 import {getState} from './jestMatchersObject';
 import type {
   AsymmetricMatcher as AsymmetricMatcherInterface,
@@ -329,6 +330,14 @@ class CloseTo extends AsymmetricMatcher<number> {
   override getExpectedType() {
     return 'number';
   }
+
+  override toAsymmetricMatcher(): string {
+    return [
+      this.toString(),
+      this.sample,
+      `(${pluralize('digit', this.precision)})`,
+    ].join(' ');
+  }
 }
 
 export const any = (expectedObject: unknown): Any => new Any(expectedObject);

packages/pretty-format/src/__tests__/AsymmetricMatcher.test.ts

@@ -131,6 +131,36 @@ test('stringNotMatching(string)', () => {
   expect(result).toEqual('StringNotMatching /jest/');
 });
 
+test('closeTo(number, precision)', () => {
+  const result = prettyFormat(expect.closeTo(1.2345, 4), options);
+  expect(result).toEqual('NumberCloseTo 1.2345 (4 digits)');
+});
+
+test('notCloseTo(number, precision)', () => {
+  const result = prettyFormat(expect.not.closeTo(1.2345, 1), options);
+  expect(result).toEqual('NumberNotCloseTo 1.2345 (1 digit)');
+});
+
+test('closeTo(number)', () => {
+  const result = prettyFormat(expect.closeTo(1.2345), options);
+  expect(result).toEqual('NumberCloseTo 1.2345 (2 digits)');
+});
+
+test('closeTo(Infinity)', () => {
+  const result = prettyFormat(expect.closeTo(-Infinity), options);
+  expect(result).toEqual('NumberCloseTo -Infinity (2 digits)');
+});
+
+test('closeTo(scientific number)', () => {
+  const result = prettyFormat(expect.closeTo(1.56e-3, 4), options);
+  expect(result).toEqual('NumberCloseTo 0.00156 (4 digits)');
+});
+
+test('closeTo(very small scientific number)', () => {
+  const result = prettyFormat(expect.closeTo(1.56e-10, 4), options);
+  expect(result).toEqual('NumberCloseTo 1.56e-10 (4 digits)');
+});
+
 test('supports multiple nested asymmetric matchers', () => {
   const result = prettyFormat(
     {

packages/pretty-format/src/plugins/AsymmetricMatcher.ts

@@ -5,6 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+import {isA} from '@jest/expect-utils';
 import {printListItems, printObjectProperties} from '../collections';
 import type {Config, NewPlugin, Printer, Refs} from '../types';
 
@@ -80,6 +81,12 @@ export const serialize: NewPlugin['serialize'] = (
     );
   }
 
+  if (!isA('Function', val.toAsymmetricMatcher)) {
+    throw new Error(
+      `Asymmetric matcher ${val.constructor.name} does not implement toAsymmetricMatcher()`,
+    );
+  }
+
   return val.toAsymmetricMatcher();
 };