feat: test file of 3Sum algorithm

Author: Ahtaxam

src/_Problems_/3Sum/3sum.test.js

@@ -0,0 +1,19 @@
+const threeSum = require("./3sum");
+
+describe("threeSum", () => {
+    it("Should return [[-1, -1, 2], [-1, 0, 1]]", () => {
+        expect(threeSum([-1, 0, 1, 2, -1, -4])).toEqual([
+            [-1, -1, 2],
+            [-1, 0, 1],
+        ]);
+    });
+
+    it("Should return [[0, 0, 0]]", () => {
+        expect(threeSum([0, 0, 0])).toEqual([[0, 0, 0]]);
+    });
+
+    it("Should return [[-1, -1, 2]]", () => {
+        expect(threeSum([-1, 2, -1, -4])).toEqual([[-1, -1, 2]]);
+    });
+
+});