diff --git a/.gitignore b/.gitignore
index 04c01ba7..25768809 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 node_modules/
-dist/
\ No newline at end of file
+dist/
+.idea/
\ No newline at end of file
diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 00000000..a9db3daf
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,32 @@
+const path = require("path");
+
+module.exports = {
+  clearMocks: true,
+  restoreMocks: true,
+  collectCoverage: true,
+  collectCoverageFrom: [path.resolve(__dirname, "src/**/*.{js,jsx,ts,tsx}")],
+  coverageDirectory: "coverage",
+  coverageReporters: ["text-summary", "lcov"],
+  coverageThreshold: {
+    global: {
+      branches: 95,
+      functions: 99,
+      lines: 99,
+      statements: 95,
+    },
+  },
+  errorOnDeprecated: true,
+  moduleNameMapper: {
+    "\\.(jpg|jpeg|png|gif|webp|svg|bmp|woff|woff2|ttf)$": "<rootDir>/test/mocks/fileMock.js",
+    "\\.(css|less|scss|sass)$": "identity-obj-proxy",
+    "test/(.*)$": "<rootDir>/test/$1",
+    "~/(.*)$": "<rootDir>/src/$1",
+  },
+  setupFilesAfterEnv: ["<rootDir>/test/setup.ts"],
+  globalTeardown: "<rootDir>/test/teardown.ts",
+  fakeTimers: {
+    enableGlobally: true,
+  },
+  verbose: true,
+  testEnvironment: "jsdom",
+};
diff --git a/package.json b/package.json
index 5482fbee..013d81a8 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
     "build:prod": "webpack --mode=production --node-env=production",
     "watch": "webpack --watch --mode=development",
     "serve": "webpack serve --mode=development",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "jest"
   },
   "directories": {
     "example": "examples"
diff --git a/src/helpers/Field.ts b/src/helpers/Field.ts
index e69de29b..f04eca48 100644
--- a/src/helpers/Field.ts
+++ b/src/helpers/Field.ts
@@ -0,0 +1,11 @@
+export type Cell = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12;
+export type Field = Cell[][];
+export type Coordinates = [number, number];
+
+export const CellState: Record<string, Cell> = {
+  empty: 0,
+  bomb: 9,
+  hidden: 10,
+  mark: 11,
+  weakMark: 12,
+};