Code refactoring, add e2e test

cypress/integration/rendering/gantt.spec.js

@@ -2,7 +2,7 @@ import { imgSnapshotTest, renderGraph } from '../../helpers/util.js';
 
 describe('Gantt diagram', () => {
   beforeEach(() => {
-    cy.clock(new Date('1010-10-10').getTime());
+    cy.clock(new Date('2010-10-10').getTime());
   });
   it('should render a gantt chart', () => {
     imgSnapshotTest(
@@ -435,4 +435,37 @@ describe('Gantt diagram', () => {
       { gantt: { topAxis: true } }
     );
   });
+
+  it('should render when compact is true', () => {
+    imgSnapshotTest(
+      `
+      gantt
+        title GANTT compact
+        dateFormat  HH:mm:ss
+        axisFormat  %Hh%M
+        compact
+
+        section DB Clean
+        Clean: 12:00:00, 10m
+        Clean: 12:30:00, 12m
+        Clean: 13:00:00, 8m
+        Clean: 13:30:00, 9m
+        Clean: 14:00:00, 13m
+        Clean: 14:30:00, 10m
+        Clean: 15:00:00, 11m
+
+        section Sessions
+        A: 12:00:00, 63m
+        B: 12:30:00, 12m
+        C: 13:05:00, 12m
+        D: 13:06:00, 33m
+        E: 13:15:00, 55m
+        F: 13:20:00, 12m
+        G: 13:32:00, 18m
+        H: 13:50:00, 20m
+        I: 14:10:00, 10m
+    `,
+      {}
+    );
+  });
 });