diff --git a/logic-exercises/jest.config.js b/logic-exercises/jest.config.js
new file mode 100644
index 0000000..320eb15
--- /dev/null
+++ b/logic-exercises/jest.config.js
@@ -0,0 +1,8 @@
+module.exports = {
+    roots: ["<rootDir>/tests"],
+    transform: {
+      "^.+\\.tsx?$": "ts-jest",
+    },
+    testRegex: "(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$",
+    moduleFileExtensions: ["ts", "tsx", "js", "jsx", "json", "node"],
+   }
\ No newline at end of file
diff --git a/logic-exercises/package.json b/logic-exercises/package.json
index eb6d6ea..0b5ce97 100644
--- a/logic-exercises/package.json
+++ b/logic-exercises/package.json
@@ -5,7 +5,8 @@
   "main": "index.js",
   "scripts": {
     "ex1": "clear && tsnd --transpile-only --ignore-watch node_modules src/exc1.ts",
-    "ex2": "clear && tsnd --transpile-only --ignore-watch node_modules src/exc2.ts"
+    "ex2": "clear && tsnd --transpile-only --ignore-watch node_modules src/exc2.ts",
+    "test": "clear && echo && jest"
   },
   "keywords": [],
   "author": "Daniel Ratti",
diff --git a/logic-exercises/src/twosum.ts b/logic-exercises/src/twosum.ts
new file mode 100644
index 0000000..200fd9f
--- /dev/null
+++ b/logic-exercises/src/twosum.ts
@@ -0,0 +1,14 @@
+interface hashTable {
+  [index: number]: number;
+}
+
+export const twoSum = (arr: number[], target: number) => {
+  let hash: hashTable = {};
+  for (let i = 0; i < arr.length; i++) {
+    let current = arr[i];
+    let next = target - current;
+    const indexNext = hash[next];
+    if (indexNext !== undefined) return [indexNext, i];
+    hash[current] = i;
+  }
+};
diff --git a/logic-exercises/tests/TwoSum.test.ts b/logic-exercises/tests/TwoSum.test.ts
new file mode 100644
index 0000000..f124557
--- /dev/null
+++ b/logic-exercises/tests/TwoSum.test.ts
@@ -0,0 +1,10 @@
+import {twoSum} from "../src/twosum"
+describe("Testing twoSum", () => {
+  it("Should return [0,1]", () => {
+    expect(twoSum([2, 7, 11, 15], 9)).toStrictEqual([0, 1]);
+  });
+
+  it("Should return [1,3]", () => {
+    expect(twoSum([4, 5, 10, 12, 21], 17)).toStrictEqual([1, 3]);
+  });
+});