Added LCM and LCM test files

src/utils/lcm.js

@@ -0,0 +1,29 @@
+//Name: Amit Jaggernauth
+//Professor: Richard Krasso
+//Course: WEB-450
+//Date: 6/9/2024
+
+// lcm.js
+
+/**
+ * Calculate the Greatest Common Divisor (GCD)
+ * using the Euclidean algorithm.
+ */
+function gcd(a, b) {
+  if (a === 0) return b;
+  return gcd(b % a, a);
+}
+
+/**
+ * Calculate the Least Common Multiple (LCM)
+ * of two positive integers.
+ */
+function lcm(a, b) {
+  if (a <= 0 || b <= 0) {
+    throw new Error("Inputs must be positive integers");
+  }
+
+  return Math.abs(a * b) / gcd(a, b);
+}
+
+module.exports = { lcm, gcd };

test/utils/lcm.test.js

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+//Name: Amit Jaggernauth
+//Professor: Richard Krasso
+//Course: WEB-450
+//Date: 6/9/2024
+
+// lcm.test.js
+
+const { lcm } = require("./lcm");
+
+describe("LCM Function", () => {
+  test("calculates LCM of two small numbers", () => {
+    expect(lcm(4, 6)).toBe(12);
+  });
+
+  test("calculates LCM when one number is a multiple of the other", () => {
+    expect(lcm(5, 20)).toBe(20);
+  });
+
+  test("throws an error for non-positive integers", () => {
+    expect(() => lcm(-3, 6)).toThrow("Inputs must be positive integers");
+  });
+});