Apply suggestions from code review

Co-authored-by: Robsdedude <dev@rouvenbauer.de>

Author: bigmontz

packages/core/test/integer.test.ts

@@ -420,11 +420,11 @@ describe('Integer', () => {
     fc.assert(fc.property(arbitraryInteger(), (a) => a.subtract(0).equals(a)))
   })
 
-  test('Integer.multiply should have 0 as identity', () => {
+  test('Integer.multiply should have 1 as identity', () => {
     fc.assert(fc.property(arbitraryInteger(), (a) => a.multiply(1).equals(a)))
   })
 
-  test('Integer.div should have 0 as identity', () => {
+  test('Integer.div should have 1 as identity', () => {
     fc.assert(fc.property(arbitraryInteger(), (a) => a.div(1).equals(a)))
   })