From 12fee45b8b1dd04522d6108bc16d5519ab42d91c Mon Sep 17 00:00:00 2001
From: chentsulin <chentsulin@gmail.com>
Date: Mon, 17 Jan 2022 14:22:03 +0800
Subject: [PATCH 1/3] chore: add a failed test for .toHaveProperty('')

---
 packages/expect/src/__tests__/matchers.test.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/expect/src/__tests__/matchers.test.js b/packages/expect/src/__tests__/matchers.test.js
index 20b48ca6053a..6868d107d135 100644
--- a/packages/expect/src/__tests__/matchers.test.js
+++ b/packages/expect/src/__tests__/matchers.test.js
@@ -1898,6 +1898,7 @@ describe('.toHaveProperty()', () => {
     [new E('div'), 'nodeType', 1],
     ['', 'length', 0],
     [memoized, 'memo', []],
+    [{'': 1}, '', 1],
   ].forEach(([obj, keyPath, value]) => {
     test(`{pass: true} expect(${stringify(
       obj,

From 399e47209b338a91d71f21aaf88b33e30e989024 Mon Sep 17 00:00:00 2001
From: chentsulin <chentsulin@gmail.com>
Date: Sun, 23 Jan 2022 14:15:58 +0800
Subject: [PATCH 2/3] fix(expect): add a fix for .toHaveProperty('')

---
 packages/expect/src/utils.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/packages/expect/src/utils.ts b/packages/expect/src/utils.ts
index 725289ebb3a4..9e546c303c26 100644
--- a/packages/expect/src/utils.ts
+++ b/packages/expect/src/utils.ts
@@ -373,9 +373,15 @@ export const partition = <T>(
 };
 
 export const pathAsArray = (propertyPath: string): Array<any> => {
+  const properties: Array<string> = [];
+
+  if (propertyPath === '') {
+    properties.push('');
+    return properties;
+  }
+
   // will match everything that's not a dot or a bracket, and "" for consecutive dots.
   const pattern = RegExp('[^.[\\]]+|(?=(?:\\.)(?:\\.|$))', 'g');
-  const properties: Array<string> = [];
 
   // Because the regex won't match a dot in the beginning of the path, if present.
   if (propertyPath[0] === '.') {

From 78beae9aa73c0d6b8ef5199c43addabff1ee6e83 Mon Sep 17 00:00:00 2001
From: chentsulin <chentsulin@gmail.com>
Date: Sun, 23 Jan 2022 15:58:03 +0800
Subject: [PATCH 3/3] chore: update changelog

---
 CHANGELOG.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2cdded6df47d..a81342083d9e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@
 
 ### Fixes
 
+- `[expect]` Add a fix for `.toHaveProperty('')` ([#12251](https://github.com/facebook/jest/pull/12251))
+
 ### Chore & Maintenance
 
 - `[*]` Update graceful-fs to ^4.2.9 ([#11749](https://github.com/facebook/jest/pull/11749))