diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..897cb9f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+node_modules
+package-lock.json
+dist
\ No newline at end of file
diff --git a/README.md b/README.md
index c9f5cca..ebb8a1f 100644
--- a/README.md
+++ b/README.md
@@ -20,26 +20,28 @@ npm install run-cache
 ## Usage
 
 ```js
-import { RunCache } from 'run-cache'
+import { RunCache } from "run-cache";
 
 // Set a cache value with 60s ttl
-RunCache.set('sample_key_1', 'sample_value_1', 60000)
+RunCache.set("sample_key_1", "sample_value_1", 60000);
 
 // Set a cache value with function definition to fetch the value later
-RunCache.setWithSourceFn('sample_key_2', () => { return Promise.resolve('sample_value_2') })
+RunCache.setWithSourceFn("sample_key_2", () => {
+  return Promise.resolve("sample_value_2");
+});
 
 // Refetch the cache value (This will call the above function and update the cache value)
-await RunCache.refetch('sample_key_2')
+await RunCache.refetch("sample_key_2");
 
 // Get a value for a given cache key
-const value = RunCache.get('sample_key_1')
+const value = RunCache.get("sample_key_1");
 
 // Delete a specific cache key
-RunCache.delete('sample_key_1');
+RunCache.delete("sample_key_1");
 
 // Delete all cache keys
-RunCache.deleteAll()
+RunCache.deleteAll();
 
 // Returns a boolean based on existence of the given cache key
-const hasCache = RunCache.has('sample_key_1')
-```
\ No newline at end of file
+const hasCache = RunCache.has("sample_key_1");
+```
diff --git a/index.ts b/index.ts
index c72eaec..8bb8edf 100644
--- a/index.ts
+++ b/index.ts
@@ -1,146 +1 @@
-type SourceFn = () => Promise<string>;
-
-type CacheState = {
-  value: string;
-  sourceFn?: SourceFn;
-  expiry?: number;
-};
-
-export class RunCache {
-  private static cache: Map<string, CacheState> = new Map<string, CacheState>();
-
-  private static getExpiry(ttl: number | undefined): number | undefined {
-    return ttl ? Date.now() + ttl : undefined;
-  }
-
-  /**
-   * Adds a value to the cache with an optional TTL.
-   *
-   * @param {string} key - The cache key.
-   * @param {string} value - The value to cache.
-   * @param {number} [ttl] - Optional time-to-live in milliseconds.
-   * @returns {void}
-   */
-  static set(key: string, value: string, ttl?: number): void {
-    RunCache.cache.set(key, { value, expiry: this.getExpiry(ttl) });
-  }
-
-  /**
-   * Adds a value to the cache using a source function and sets an optional TTL.
-   * The source function is used to generate the value and is stored for future refetching.
-   *
-   * @param {string} key - The cache key.
-   * @param {SourceFn} sourceFn - The function used to generate the value to be cached.
-   * @param {number} [ttl] - Optional time-to-live in milliseconds.
-   * @returns {Promise<void>} A promise that resolves when the value is set.
-   * @throws Will throw an error if the source function fails.
-   */
-  static async setWithSourceFn(
-    key: string,
-    sourceFn: SourceFn,
-    ttl?: number,
-  ): Promise<void> {
-    try {
-      const value = await sourceFn.call(this);
-      RunCache.cache.set(key, {
-        value: JSON.stringify(value),
-        expiry: this.getExpiry(ttl),
-        sourceFn: sourceFn,
-      });
-    } catch (e) {
-      throw e;
-    }
-  }
-
-  /**
-   * Refetches the cached value using the stored source function and updates the cache with the new value.
-   *
-   * @param {string} key - The cache key.
-   * @param {number} [ttl] - Optional time-to-live in milliseconds for the updated value.
-   * @returns {Promise<void>} A promise that resolves when the value is updated.
-   * @throws Will throw an error if the source function fails.
-   */
-  static async refetch(key: string, ttl?: number): Promise<void> {
-    const cached = RunCache.cache.get(key);
-
-    if (!cached) {
-      return;
-    }
-
-    if (!cached.sourceFn) {
-      return;
-    }
-
-    try {
-      const value = await cached.sourceFn.call(this);
-      RunCache.cache.set(key, {
-        value: JSON.stringify(value),
-        expiry: this.getExpiry(ttl),
-        sourceFn: cached.sourceFn,
-      });
-    } catch (e) {
-      throw e;
-    }
-  }
-
-  /**
-   * Retrieves the cached value associated with the given key if it exists and has not expired.
-   *
-   * @param {string} key - The cache key.
-   * @returns {string | undefined} The cached value, or undefined if not found or expired.
-   */
-  static get(key: string): string | undefined {
-    const cached = RunCache.cache.get(key);
-
-    if (!cached) {
-      return undefined;
-    }
-
-    if (cached.expiry && cached.expiry < Date.now()) {
-      RunCache.cache.delete(key);
-      return undefined;
-    }
-
-    return cached.value;
-  }
-
-  /**
-   * Deletes the cached value associated with the given key.
-   *
-   * @param {string} key - The cache key.
-   * @returns {boolean} True if the key was deleted, false otherwise.
-   */
-  static delete(key: string): boolean {
-    return RunCache.cache.delete(key);
-  }
-
-  /**
-   * Clears all cached values.
-   *
-   * @returns {void}
-   */
-  static deleteAll(): void {
-    RunCache.cache.clear();
-  }
-
-  /**
-   * Checks if the cache contains a valid (non-expired) value for the given key.
-   *
-   * @param {string} key - The cache key.
-   * @returns {boolean} True if the cache contains a valid value for the key, false otherwise.
-   */
-  static has(key: string): boolean {
-    const cached = RunCache.cache.get(key);
-
-    if (!cached) {
-      return false;
-    }
-
-    if (cached.expiry && cached.expiry < Date.now()) {
-      RunCache.cache.delete(key);
-      return false;
-    }
-
-    return true;
-  }
-}
+export { RunCache } from "./src/run-cache";
diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 0000000..28777fa
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,9 @@
+// jest.config.js
+export default {
+  preset: "ts-jest",
+  testEnvironment: "node",
+  transform: {
+    "^.+\\.tsx?$": "ts-jest", // Transform TypeScript files using ts-jest
+  },
+  extensionsToTreatAsEsm: [".ts"], // Treat .ts files as ES modules
+};
diff --git a/package.json b/package.json
index 0213559..1d63de6 100644
--- a/package.json
+++ b/package.json
@@ -1,16 +1,27 @@
 {
   "name": "run-cache",
-  "version": "1.0.4",
+  "version": "1.0.5",
   "description": "`RunCache` is a dependency nil, light-weight in-memory caching library for JavaScript and TypeScript that allows you to cache `string` values with optional time-to-live (TTL) settings. It also supports caching values generated from asynchronous functions and provides methods to refetch them on demand.",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "jest test.ts"
   },
-  "keywords": ["cache", "runtime", "in-memory", "memory"],
+  "type": "module",
+  "keywords": [
+    "cache",
+    "runtime",
+    "in-memory",
+    "memory"
+  ],
   "author": "helloscoopa",
   "license": "MIT",
   "repository": {
     "type": "git",
     "url": "https://github.com/helloscoopa/run-cache.git"
+  },
+  "devDependencies": {
+    "@types/jest": "^29.5.12",
+    "jest": "^29.7.0",
+    "ts-jest": "^29.2.5"
   }
 }
diff --git a/src/run-cache.test.ts b/src/run-cache.test.ts
new file mode 100644
index 0000000..85a6ba2
--- /dev/null
+++ b/src/run-cache.test.ts
@@ -0,0 +1,150 @@
+import { RunCache } from "./run-cache";
+
+describe("RunCache", () => {
+  beforeEach(() => {
+    RunCache.deleteAll();
+  });
+
+  describe("set()", () => {
+    it("should throw an error if the cache key or value is empty", () => {
+      expect(() => RunCache.set("", "value1")).toThrow("Empty key");
+      expect(() => RunCache.set("key1", "")).toThrow("Empty value");
+    });
+
+    it("should return true if the cache value set successfully", () => {
+      expect(RunCache.set("key1", "value1")).toBe(true);
+    });
+
+    it("should return true if the cache set with a ttl and ttl is functioning properly", () => {
+      expect(RunCache.set("key2", "value2", 100)).toBe(true);
+      expect(RunCache.get("key2")).toBe("value2");
+
+      // Wait for the TTL to expire
+      setTimeout(() => {
+        expect(RunCache.get("key2")).toBeUndefined();
+      }, 150);
+    });
+  });
+
+  describe("get()", () => {
+    it("should return undefined if the key is empty", () => {
+      expect(RunCache.get("")).toBeUndefined();
+    });
+
+    it("should return undefined if the key is not found", () => {
+      expect(RunCache.get("key1")).toBeUndefined();
+    });
+
+    it("should return the value successfully", () => {
+      RunCache.set("key1", "value1");
+      expect(RunCache.get("key1")).toBe("value1");
+    });
+  });
+
+  describe("delete()", () => {
+    it("should return false if the operation failed", () => {
+      expect(RunCache.delete("nonExistentKey")).toBe(false);
+    });
+
+    it("should return true if the value is successfully deleted", () => {
+      RunCache.set("key1", "value1");
+      expect(RunCache.delete("key1")).toBe(true);
+      expect(RunCache.get("key1")).toBeUndefined();
+    });
+  });
+
+  describe("deleteAll()", () => {
+    it("should clear all values", () => {
+      RunCache.set("key1", "value1");
+      RunCache.set("key2", "value2");
+      RunCache.deleteAll();
+      expect(RunCache.get("key1")).toBeUndefined();
+      expect(RunCache.get("key2")).toBeUndefined();
+    });
+  });
+
+  describe("has()", () => {
+    it("should return true if the key exists", () => {
+      RunCache.set("key1", "value1");
+      expect(RunCache.has("key1")).toBe(true);
+    });
+
+    it("should return false if the key exists", () => {
+      expect(RunCache.has("nonExistentKey")).toBe(false);
+    });
+
+    it("should return false after ttl expiry", () => {
+      RunCache.set("key2", "value2", 50); // Set TTL to 50ms
+      expect(RunCache.has("key2")).toBe(true);
+
+      // Wait for the TTL to expire
+      setTimeout(() => {
+        expect(RunCache.has("key2")).toBe(false);
+      }, 100);
+    });
+  });
+
+  describe("setWithSourceFn()", () => {
+    it("should throw an error when the source function throws an error", async () => {
+      let sourceFn = async () => {
+        throw Error("Unexpected Error");
+      };
+      expect(RunCache.setWithSourceFn("key1", sourceFn)).rejects.toThrow(
+        "Source function failed",
+      );
+    });
+
+    it("should be able to set a value with source function successfully", async () => {
+      const sourceFn = async () => "dynamicValue";
+      await RunCache.setWithSourceFn("key2", sourceFn);
+      expect(RunCache.get("key2")).toBe('"dynamicValue"');
+    });
+  });
+
+  describe("refetch()", () => {
+    it("should throw an error if refetch is called on a key having no source function", async () => {
+      RunCache.set("key2", "value2");
+      await expect(RunCache.refetch("key2")).rejects.toThrow(
+        "No source function found",
+      );
+    });
+
+    it("should throw an error when the source function throws an error", async () => {
+      let breaker = false;
+
+      let sourceFn = async () => {
+        if (breaker) {
+          throw Error("Unexpected Error");
+        } else {
+          return "SomeValue";
+        }
+      };
+      await RunCache.setWithSourceFn("key3", sourceFn);
+
+      // Make source function to fail
+      breaker = true;
+
+      expect(RunCache.refetch("key3")).rejects.toThrow(
+        "Source function failed",
+      );
+    });
+
+    it("should not refetch if the key does not exist", async () => {
+      await expect(RunCache.refetch("nonExistentKey")).resolves.toBeFalsy();
+    });
+
+    it("should refetch and update the value from the source function", async () => {
+      let dynamicValue = "initialValue";
+      const sourceFn = async () => dynamicValue;
+
+      await RunCache.setWithSourceFn("key1", sourceFn);
+      expect(RunCache.get("key1")).toBe('"initialValue"');
+
+      // Update what's being returned in the source function
+      dynamicValue = "updatedValue";
+
+      await RunCache.refetch("key1");
+      expect(RunCache.get("key1")).toBe('"updatedValue"');
+    });
+  });
+});
diff --git a/src/run-cache.ts b/src/run-cache.ts
new file mode 100644
index 0000000..7ebcdfa
--- /dev/null
+++ b/src/run-cache.ts
@@ -0,0 +1,165 @@
+type SourceFn = () => Promise<string>;
+
+type CacheState = {
+  value: string;
+  sourceFn?: SourceFn;
+  expiry?: number;
+};
+
+class RunCache {
+  private static cache: Map<string, CacheState> = new Map<string, CacheState>();
+
+  private static getExpiry(ttl: number | undefined): number | undefined {
+    return ttl ? Date.now() + ttl : undefined;
+  }
+
+  /**
+   * Adds a value to the cache with an optional TTL.
+   *
+   * @param {string} key - The cache key.
+   * @param {string} value - The value to cache.
+   * @param {number} [ttl] - Optional time-to-live in milliseconds.
+   * @returns {boolean} - The state of the operation
+   * @throws Will throw an error if the key or value is empty
+   */
+  static set(key: string, value: string, ttl?: number): boolean {
+    if (!key.length) {
+      throw Error("Empty key");
+    }
+
+    if (!value.length) {
+      throw Error("Empty value");
+    }
+
+    RunCache.cache.set(key, { value, expiry: this.getExpiry(ttl) });
+
+    return true;
+  }
+
+  /**
+   * Adds a value to the cache using a source function and sets an optional TTL.
+   * The source function is used to generate the value and is stored for future refetching.
+   *
+   * @param {string} key - The cache key.
+   * @param {SourceFn} sourceFn - The function used to generate the value to be cached.
+   * @param {number} [ttl] - Optional time-to-live in milliseconds.
+   * @returns {Promise<void>}
+   * @throws Will throw an error if the source function fails.
+   */
+  static async setWithSourceFn(
+    key: string,
+    sourceFn: SourceFn,
+    ttl?: number,
+  ): Promise<void> {
+    try {
+      const value = await sourceFn.call(this);
+      RunCache.cache.set(key, {
+        value: JSON.stringify(value),
+        expiry: this.getExpiry(ttl),
+        sourceFn: sourceFn,
+      });
+    } catch (e) {
+      throw Error("Source function failed");
+    }
+  }
+
+  /**
+   * Refetches the cached value using the stored source function and updates the cache with the new value.
+   *
+   * @param {string} key - The cache key.
+   * @param {number} [ttl] - Optional time-to-live in milliseconds for the updated value.
+   * @returns {Promise<boolean>} A promise that resolves to a boolean representing the execution state of the request.
+   * @throws Will throw an error if the source function fails.
+   */
+  static async refetch(key: string, ttl?: number): Promise<boolean> {
+    const cached = RunCache.cache.get(key);
+
+    if (!cached) {
+      return false;
+    }
+
+    if (!cached.sourceFn) {
+      throw Error("No source function found");
+    }
+
+    try {
+      const value = await cached.sourceFn.call(this);
+      RunCache.cache.set(key, {
+        value: JSON.stringify(value),
+        expiry: this.getExpiry(ttl),
+        sourceFn: cached.sourceFn,
+      });
+
+      return true;
+    } catch (e) {
+      throw Error("Source function failed");
+    }
+  }
+
+  /**
+   * Retrieves the cached value associated with the given key if it exists and has not expired.
+   *
+   * @param {string} key - The cache key.
+   * @returns {string | undefined} The cached value, or undefined if not found or expired.
+   */
+  static get(key: string): string | undefined {
+    if (!key) {
+      return undefined;
+    }
+
+    const cached = RunCache.cache.get(key);
+
+    if (!cached) {
+      return undefined;
+    }
+
+    if (cached.expiry && cached.expiry < Date.now()) {
+      RunCache.cache.delete(key);
+      return undefined;
+    }
+
+    return cached.value;
+  }
+
+  /**
+   * Deletes the cached value associated with the given key.
+   *
+   * @param {string} key - The cache key.
+   * @returns {boolean} True if the key was deleted, false otherwise.
+   */
+  static delete(key: string): boolean {
+    return RunCache.cache.delete(key);
+  }
+
+  /**
+   * Clears all cached values.
+   *
+   * @returns {void}
+   */
+  static deleteAll(): void {
+    RunCache.cache.clear();
+  }
+
+  /**
+   * Checks if the cache contains a valid (non-expired) value for the given key.
+   *
+   * @param {string} key - The cache key.
+   * @returns {boolean} True if the cache contains a valid value for the key, false otherwise.
+   */
+  static has(key: string): boolean {
+    const cached = RunCache.cache.get(key);
+
+    if (!cached) {
+      return false;
+    }
+
+    if (cached.expiry && cached.expiry < Date.now()) {
+      RunCache.cache.delete(key);
+      return false;
+    }
+
+    return true;
+  }
+}
+
+export { RunCache };
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..066dfe3
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": ".",
+    "esModuleInterop": true
+  }
+}