Add more negative-value test cases for isProperFraction

Author: BrianY315

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

@@ -19,6 +19,9 @@ test("Handles zero and negative values", () => {
   assert.equal(isProperFraction(-1, 2), true);
   assert.equal(isProperFraction(1, -2), true);
   assert.equal(isProperFraction(-3, -2), false);
+  assert.equal(isProperFraction(-1, -2), true);
+  assert.equal(isProperFraction(-3, 2), false);
+  assert.equal(isProperFraction(3, -2), false);
 });
 
 test("Rejects a zero denominator", () => {

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

@@ -10,6 +10,9 @@ test.each([
   [-1, 2, true],
   [1, -2, true],
   [-3, -2, false],
+  [-1, -2, true],
+  [-3, 2, false],
+  [3, -2, false],
   [0, 0, false],
   [1, 0, false],
 ])("checks %i/%i", (numerator, denominator, expected) => {