diff --git a/.eslintignore b/.eslintignore
index bb27d65..91d6c44 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1,4 +1,5 @@
 coverage
 __test__/tape/
 __test__/jest/jest-repo/
+__test__/jest-extended/
 __test__/jest-when/when.test.cjs
diff --git a/.prettierignore b/.prettierignore
index 9e7b186..c51dc22 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -2,4 +2,5 @@ coverage
 pnpm-lock.yaml
 __test__/tape/
 __test__/jest/jest-repo/
+__test__/jest-extended/
 __test__/jest-when/when.test.cjs
diff --git a/package.json b/package.json
index 6f78967..033d830 100644
--- a/package.json
+++ b/package.json
@@ -66,6 +66,8 @@
     "@types/jest-when": "^3.5.2",
     "@typescript-eslint/eslint-plugin": "^7.15.0",
     "eslint": "^8.44.0",
+    "jest-matcher-utils": "^29.7.0",
+    "jest-serializer-ansi-escapes": "^3.0.0",
     "jest-when": "^3.6.0"
   },
   "packageManager": "pnpm@9.4.0+sha1.9217c800d4ab947a7aee520242a7b70d64fc7638"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 8c540af..c5475be 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -48,6 +48,12 @@ importers:
       eslint:
         specifier: ^8.44.0
         version: 8.57.0
+      jest-matcher-utils:
+        specifier: ^29.7.0
+        version: 29.7.0
+      jest-serializer-ansi-escapes:
+        specifier: ^3.0.0
+        version: 3.0.0
       jest-when:
         specifier: ^3.6.0
         version: 3.6.0(jest@29.7.0(@types/node@20.14.10))
@@ -1679,6 +1685,10 @@ packages:
     resolution: {integrity: sha512-gUnLjgwdGqW7B4LvOIkbKs9WGbn+QLqRQQ9juC6HndeDiezIwhDP+mhMwHWCEcfQ5RUXa6OPnFF8BJh5xegwwQ==}
     engines: {node: ^14.15.0 || ^16.10.0 || >=18.0.0}
 
+  jest-serializer-ansi-escapes@3.0.0:
+    resolution: {integrity: sha512-dyj/uFvD45xeUw8U1XPU2Fu0KVjslp3iG/ucpB7x69rLyoaxFWelIV/NfrPzJavjcGJ1tF2LNSlv9tylwhfliA==}
+    engines: {node: '>=16'}
+
   jest-snapshot@29.7.0:
     resolution: {integrity: sha512-Rm0BMWtxBcioHr1/OX5YCP8Uov4riHvKPknOGs804Zg9JGZgmIBkbtlxJC/7Z4msKYVbIJtfU+tKb8xlYNfdkw==}
     engines: {node: ^14.15.0 || ^16.10.0 || >=18.0.0}
@@ -2008,6 +2018,10 @@ packages:
     engines: {node: '>=14'}
     hasBin: true
 
+  pretty-ansi@2.0.0:
+    resolution: {integrity: sha512-AN74nXfCper9y7CuktdWuJT5zwqVfST0LOBZMbEsDKIZ/QulzecDqDF4j+lQbzdKHKbAQU7UyqUVJBocisVjNw==}
+    engines: {node: '>=16'}
+
   pretty-format@29.7.0:
     resolution: {integrity: sha512-Pdlw/oPxN+aXdmM9R00JVC9WVFoCLTKJvDVLgmJ+qAffBMxsV85l/Lu7sNx4zSzPyoL2euImuEwHhOXdEgNFZQ==}
     engines: {node: ^14.15.0 || ^16.10.0 || >=18.0.0}
@@ -4491,6 +4505,10 @@ snapshots:
     transitivePeerDependencies:
       - supports-color
 
+  jest-serializer-ansi-escapes@3.0.0:
+    dependencies:
+      pretty-ansi: 2.0.0
+
   jest-snapshot@29.7.0:
     dependencies:
       '@babel/core': 7.24.7
@@ -4821,6 +4839,8 @@ snapshots:
 
   prettier@3.3.2: {}
 
+  pretty-ansi@2.0.0: {}
+
   pretty-format@29.7.0:
     dependencies:
       '@jest/schemas': 29.6.3