[6.8] [Discover] Unskip Discover histogram time range test (elastic#7…

…1056) (elastic#73771)

- Adaption of expected the time range when the histogram was brushed

test/functional/apps/discover/_discover.js

@@ -138,14 +138,13 @@ export default function ({ getService, getPageObjects }) {
         expect(actualTimeString).to.be('September 20th 2015, 00:00:00.000 to September 20th 2015, 03:00:00.000');
       });
 
-      // FAILING: https://github.com/elastic/kibana/issues/38361
-      it.skip('should modify the time range when the histogram is brushed', async function () {
+      it('should modify the time range when the histogram is brushed', async function () {
         await PageObjects.header.setAbsoluteRange(fromTime, toTime);
         await PageObjects.visualize.waitForVisualization();
         await PageObjects.discover.brushHistogram(0, 1);
         await PageObjects.visualize.waitForVisualization();
         const actualTimeString = await PageObjects.header.getPrettyDuration();
-        expect(actualTimeString).to.be('September 19th 2015, 23:52:17.080 to September 20th 2015, 02:59:51.112');
+        expect(actualTimeString).to.be('September 19th 2015, 23:53:43.254 to September 20th 2015, 02:52:36.173');
       });
 
       it('should show correct initial chart interval of Auto', async function () {