fix: do not display -0 downtime, add downtime tests

Author: artemmufazalov

src/utils/dataFormatters/__test__/formatUptime.test.ts

@@ -1,4 +1,4 @@
-import {getUptimeFromDateFormatted} from '../dataFormatters';
+import {getDowntimeFromDateFormatted, getUptimeFromDateFormatted} from '../dataFormatters';
 
 describe('getUptimeFromDateFormatted', () => {
     it('should calculate and format uptime', () => {
@@ -8,3 +8,14 @@ describe('getUptimeFromDateFormatted', () => {
         expect(getUptimeFromDateFormatted(3_600_000, 3_599_000)).toBe('0:00:00');
     });
 });
+describe('getDowntimeFromDateFormatted', () => {
+    it('should calculate and format downtime as -uptime', () => {
+        expect(getDowntimeFromDateFormatted(3_600_000, 7_200_000)).toBe('-1:00:00');
+    });
+    it('should not add sign if downtime is 0', () => {
+        expect(getDowntimeFromDateFormatted(3_600_000, 3_600_000)).toBe('0:00:00');
+    });
+    it('should return 0 if dateFrom after dateTo', () => {
+        expect(getDowntimeFromDateFormatted(3_600_000, 3_599_000)).toBe('0:00:00');
+    });
+});

src/utils/dataFormatters/dataFormatters.ts

@@ -66,7 +66,16 @@ export function getUptimeFromDateFormatted(dateFrom?: number | string, dateTo?:
 }
 
 export function getDowntimeFromDateFormatted(dateFrom?: number | string, dateTo?: number | string) {
-    return '-' + getUptimeFromDateFormatted(dateFrom, dateTo);
+    let diff = calcTimeDiffInSec(dateFrom, dateTo);
+
+    // Our time and server time could differ a little
+    // Prevent wrong negative uptime values
+    diff = diff < 0 ? 0 : diff;
+
+    const formattedUptime = formatUptimeInSeconds(diff);
+
+    // Do not add sign to 0 values to prevent -0:00:00 uptime
+    return diff === 0 ? formattedUptime : '-' + formattedUptime;
 }
 
 export function calcTimeDiffInSec(