add comprehensive tests for isProperFraction function to cover various cases

Author: rahanasuleiman8-ship-it

implement-and-rewrite-tests/implement-tests-with-node-test/2-is-proper-fraction.test.js

@@ -6,7 +6,33 @@ import { isProperFraction } from "../implement/2-is-proper-fraction.js";
 // TODO: Write tests to cover all cases.
 // What combinations of numerators and denominators should you test?
 
+
 test("Basic proper fraction", () => {
   // Example: 1/2 is a proper fraction
   assert.equal(isProperFraction(1, 2), true);
+  assert.equal(isProperFraction(3, 4), true);
+});
+
+test("Improper fraction where numerator is larger than denominator", () => {
+  assert.equal(isProperFraction(5, 2), false);
+  assert.equal(isProperFraction(4, 3), false);
+});
+
+test("Equal numerator and denominator (equals 1)", () => {
+  assert.equal(isProperFraction(3, 3), false);
 });
+
+test("Denominator is zero", () => {
+  assert.equal(isProperFraction(1, 0), false);
+  assert.equal(isProperFraction(0, 0), false);
+});
+
+test("Zero numerator with non-zero denominator", () => {
+  assert.equal(isProperFraction(0, 5), true);
+});
+
+test("Negative numbers", () => {
+  assert.equal(isProperFraction(-1, 2), true);
+  assert.equal(isProperFraction(1, -2), true);
+  assert.equal(isProperFraction(-3, -2), false);
+});