add jest

jest.config.js

@@ -0,0 +1,17 @@
+module.exports = {
+  roots: ['<rootDir>'],
+  moduleFileExtensions: ['ts', 'tsx', 'js', 'json', 'jsx'],
+  testPathIgnorePatterns: ['<rootDir>[/\\\\](node_modules|.next)[/\\\\]'],
+  transformIgnorePatterns: ['[/\\\\]node_modules[/\\\\].+\\.(ts|tsx)$'],
+  transform: {
+    '^.+\\.(ts|tsx)$': 'babel-jest',
+  },
+  watchPlugins: [
+    'jest-watch-typeahead/filename',
+    'jest-watch-typeahead/testname',
+  ],
+  moduleNameMapper: {
+    '\\.(css|less|sass|scss)$': 'identity-obj-proxy',
+    '\\.(gif|ttf|eot|svg|png)$': '<rootDir>/test/__mocks__/fileMock.js',
+  },
+}