chore: install jest

Author: omermecitoglu

.gitignore

@@ -5,3 +5,4 @@ node_modules
 next-env.d.ts
 .env*.local
 buttler.db
+coverage

jest.config.ts

@@ -0,0 +1,26 @@
+import type { JestConfigWithTsJest } from "ts-jest";
+
+const jestConfig: JestConfigWithTsJest = {
+  preset: "ts-jest",
+  moduleDirectories: ["node_modules", "<rootDir>"],
+  modulePathIgnorePatterns: [
+    "<rootDir>/.next",
+    "<rootDir>/dist",
+  ],
+  moduleNameMapper: {
+    "^~/(.*)$": "<rootDir>/src/$1",
+  },
+  transform: {
+    "^.+\\.[tj]s$": ["ts-jest", {
+      tsconfig: {
+        allowJs: true,
+      },
+    }],
+  },
+  transformIgnorePatterns: [
+    "<rootDir>/node_modules/(?!change-case)",
+  ],
+  collectCoverage: true,
+};
+
+export default jestConfig;