diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 0000000..eef6b07
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,4 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node'
+};
diff --git a/package-lock.json b/package-lock.json
index 609cf88..a43dbe2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,26 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
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+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
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+      "dev": true,
+      "requires": {
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+      }
+    },
+    "@babel/highlight": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
+      "integrity": "sha512-UFMC4ZeFC48Tpvj7C8UgLvtkaUuovQX+5xNWrsIoMG8o2z+XFKjKaN9iVmS84dPwVN00W4wPmqvYoZF3EGAsfw==",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
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       "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.3.1.tgz",
@@ -66,6 +86,12 @@
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     },
+    "@types/jest": {
+      "version": "23.3.13",
+      "resolved": "https://registry.npmjs.org/@types/jest/-/jest-23.3.13.tgz",
+      "integrity": "sha512-ePl4l+7dLLmCucIwgQHAgjiepY++qcI6nb8eAwGNkB6OxmTe3Z9rQU3rSpomqu42PCCnlThZbOoxsf+qylJsLA==",
+      "dev": true
+    },
     "@types/prop-types": {
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       "resolved": "https://registry.npmjs.org/@types/prop-types/-/prop-types-15.5.8.tgz",
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       "dev": true
     },
+    "abab": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.0.tgz",
+      "integrity": "sha512-sY5AXXVZv4Y1VACTtR11UJCPHHudgY5i26Qj5TypE6DKlIApbwb5uqhXcJ5UUGbvZNRh7EeIoW+LrJumBsKp7w==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz",
@@ -518,6 +550,30 @@
         "acorn": "^5.0.0"
       }
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+      "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-4.3.0.tgz",
+      "integrity": "sha512-hMtHj3s5RnuhvHPowpBYvJVj3rAar82JiDQHvGs1zO0l10ocX/xEdBShNHTJaboucJUsScghp74pH3s7EnHHQw==",
+      "dev": true,
+      "requires": {
+        "acorn": "^6.0.1",
+        "acorn-walk": "^6.0.1"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "6.0.6",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.0.6.tgz",
+          "integrity": "sha512-5M3G/A4uBSMIlfJ+h9W125vJvPFH/zirISsW5qfxF5YzEvXJCtolLoQvM5yZft0DvMcUrPGKPOlgEu55I6iUtA==",
+          "dev": true
+        }
+      }
+    },
+    "acorn-walk": {
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.1.1.tgz",
+      "integrity": "sha512-OtUw6JUTgxA2QoqqmrmQ7F2NYqiBPi/L2jqHyFtllhOUvXYQXf0Z1CYUinIfyT4bTCGmrA7gX9FvHA81uzCoVw==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.7.0.tgz",
@@ -548,6 +604,12 @@
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       "dev": true
     },
+    "ansi-escapes": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
+      "integrity": "sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==",
+      "dev": true
+    },
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@@ -579,12 +641,30 @@
         "normalize-path": "^2.1.1"
       }
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+      "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-0.4.0.tgz",
+      "integrity": "sha1-126/jKlNJ24keja61EpLdKthGZE=",
+      "dev": true,
+      "requires": {
+        "default-require-extensions": "^1.0.0"
+      }
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       "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
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       "dev": true
     },
+    "argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
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@@ -603,6 +683,12 @@
       "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
       "dev": true
     },
+    "array-equal": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/array-equal/-/array-equal-1.0.0.tgz",
+      "integrity": "sha1-jCpe8kcv2ep0KwTHenUJO6J1fJM=",
+      "dev": true
+    },
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@@ -630,6 +716,21 @@
       "integrity": "sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg=",
       "dev": true
     },
+    "arrify": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
+      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
+      "dev": true
+    },
+    "asn1": {
+      "version": "0.2.4",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
+      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
+      "dev": true,
+      "requires": {
+        "safer-buffer": "~2.1.0"
+      }
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@@ -667,12 +768,24 @@
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+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+      "dev": true
+    },
     "assign-symbols": {
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       "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
       "dev": true
     },
+    "astral-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
+      "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==",
+      "dev": true
+    },
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@@ -685,12 +798,331 @@
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       "dev": true
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       "dev": true
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+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
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+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.2.tgz",
+      "integrity": "sha512-s0b6vB3xIVRLWywa6X9TOMA7k9zio0TMOsl9ZnDkliA/cfJlpHXAscj0gbHVJiTdIuAYpIyqS5GW91fqm6gG5g==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
+    },
+    "ws": {
+      "version": "5.2.2",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-5.2.2.tgz",
+      "integrity": "sha512-jaHFD6PFv6UgoIVda6qZllptQsMlDEJkTQcybzzXDYM1XO9Y8em691FGMPmM46WGyLU4z9KMgQN+qrux/nhlHA==",
+      "dev": true,
+      "requires": {
+        "async-limiter": "~1.0.0"
+      }
+    },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
+      "dev": true
+    },
     "xregexp": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/xregexp/-/xregexp-4.0.0.tgz",
diff --git a/package.json b/package.json
index 79d05ea..b8ed470 100644
--- a/package.json
+++ b/package.json
@@ -5,17 +5,21 @@
   "main": "index.js",
   "scripts": {
     "start": "webpack-dev-server --mode development --progress",
-    "build": "webpack --mode production"
+    "build": "webpack --mode production",
+    "test": "jest --watch"
   },
   "keywords": [],
   "author": "",
   "license": "ISC",
   "devDependencies": {
+    "@types/jest": "^23.3.13",
     "@types/react": "^16.7.20",
     "@types/react-dom": "^16.0.11",
-    "@types/redux": "^3.6.0",
     "@types/react-redux": "^7.0.0",
+    "@types/redux": "^3.6.0",
     "html-webpack-plugin": "^3.2.0",
+    "jest": "^23.6.0",
+    "ts-jest": "^23.10.5",
     "ts-loader": "^5.3.3",
     "typescript": "^3.2.4",
     "webpack": "^4.28.4",
diff --git a/playground/src/reducers/__tests__/reducers.spec.ts b/playground/src/reducers/__tests__/reducers.spec.ts
new file mode 100644
index 0000000..b666d8a
--- /dev/null
+++ b/playground/src/reducers/__tests__/reducers.spec.ts
@@ -0,0 +1,10 @@
+import { reducer } from '../index';
+
+describe('reducers', () => {
+  it('should add item to the list', () => {
+    const newStore = reducer({ todos: {}, filter: 'all' }, { type: 'add', label: 'hello' });
+    const keys = Object.keys(newStore.todos);
+    expect(keys.length).toBe(1);
+    expect(newStore.todos[keys[0]].label).toBe('hello');
+  });
+});