Corrected Currency Display: Enforce Two Decimal Places in Amounts

src/libs/CurrencyUtils.ts

@@ -96,8 +96,11 @@ function convertToFrontendAmountAsInteger(amountAsInt: number): number {
  *
  * @note we do not support any currencies with more than two decimal places.
  */
-function convertToFrontendAmountAsString(amountAsInt: number): string {
-    return amountAsInt ? convertToFrontendAmountAsInteger(amountAsInt).toFixed(2) : '';
+function convertToFrontendAmountAsString(amountAsInt: number | null | undefined): string {
+    if (amountAsInt === null || amountAsInt === undefined) {
+        return '';
+    }
+    return convertToFrontendAmountAsInteger(amountAsInt).toFixed(2);
 }
 
 /**

tests/unit/CurrencyUtilsTest.ts

@@ -123,8 +123,12 @@
             [2550, '25.50'],
             [25, '0.25'],
             [2500.5, '25.00'],
-        ])('Correctly converts %s to amount in units handled in frontend as a string', (amount, expectedResult) => {
-            expect(CurrencyUtils.convertToFrontendAmountAsString(amount)).toBe(expectedResult);
+            [null, ''],
+            [undefined, ''],
+            ['', '0.00'],
+            [0, '0.00'],
+        ])('Correctly converts %s to amount in units handled in frontend as a string', (input, expectedResult) => {
+            expect(CurrencyUtils.convertToFrontendAmountAsString(input)).toBe(expectedResult);
         });
     });
     describe('convertToDisplayString', () => {