test: fix test to properly pass in invalid inputs individually

packages/loot-core/src/server/timestamp.test.js

@@ -24,7 +24,7 @@ describe('Timestamp', function() {
 
   describe('parsing', function() {
     it('should not parse', function() {
-      var invalid = [
+      const invalidInputs = [
         null,
         undefined,
         {},
@@ -40,26 +40,26 @@ describe('Timestamp', function() {
         '9999-12-31T23:59:59.999Z-10000-FFFFFFFFFFFFFFFF',
         '9999-12-31T23:59:59.999Z-FFFF-10000000000000000'
       ];
-      for (var i = 0; i < invalid.length; i++) {
-        expect(Timestamp.parse(invalid)).toBe(null);
+      for (const invalidInput of invalidInputs) {
+        expect(Timestamp.parse(invalidInput)).toBe(null);
       }
     });
 
     it('should parse', function() {
-      var valid = [
+      var validInputs = [
         '1970-01-01T00:00:00.000Z-0000-0000000000000000',
         '2015-04-24T22:23:42.123Z-1000-0123456789ABCDEF',
         '9999-12-31T23:59:59.999Z-FFFF-FFFFFFFFFFFFFFFF'
       ];
-      for (var i = 0; i < valid.length; i++) {
-        var parsed = Timestamp.parse(valid[i]);
+      for (const validInput of validInputs) {
+        var parsed = Timestamp.parse(validInput);
         expect(typeof parsed).toBe('object');
         expect(parsed.millis() >= 0).toBeTruthy();
         expect(parsed.millis() < 253402300800000).toBeTruthy();
         expect(parsed.counter() >= 0).toBeTruthy();
         expect(parsed.counter() < 65536).toBeTruthy();
         expect(typeof parsed.node()).toBe('string');
-        expect(parsed.toString()).toBe(valid[i]);
+        expect(parsed.toString()).toBe(validInput);
       }
     });
   });