Regression on tooltip template creation process. (#34628)

* Regression on tooltip template creation process.

* check if template content does not exist, or given argument is empty

* call `setContent()` once.

js/tests/unit/popover.spec.js

@@ -1,7 +1,7 @@
 import Popover from '../../src/popover'
 
 /** Test helpers */
-import { getFixture, clearFixture, jQueryMock } from '../helpers/fixture'
+import { clearFixture, getFixture, jQueryMock } from '../helpers/fixture'
 
 describe('Popover', () => {
   let fixtureEl
@@ -157,6 +157,37 @@ describe('Popover', () => {
       popover.show()
     })
 
+    it('should call setContent once', done => {
+      fixtureEl.innerHTML = '<a href="#">BS twitter</a>'
+
+      const popoverEl = fixtureEl.querySelector('a')
+      const popover = new Popover(popoverEl, {
+        content: 'Popover content'
+      })
+
+      const spy = spyOn(popover, 'setContent').and.callThrough()
+      let times = 1
+
+      popoverEl.addEventListener('hidden.bs.popover', () => {
+        popover.show()
+      })
+
+      popoverEl.addEventListener('shown.bs.popover', () => {
+        const popoverDisplayed = document.querySelector('.popover')
+
+        expect(popoverDisplayed).not.toBeNull()
+        expect(popoverDisplayed.querySelector('.popover-body').textContent).toEqual('Popover content')
+        expect(spy).toHaveBeenCalledTimes(1)
+        if (times > 1) {
+          done()
+        }
+
+        times++
+        popover.hide()
+      })
+      popover.show()
+    })
+
     it('should show a popover with provided custom class', done => {
       fixtureEl.innerHTML = '<a href="#" title="Popover" data-bs-content="https://twitter.com/getbootstrap" data-bs-custom-class="custom-class">BS twitter</a>'
 

js/tests/unit/tooltip.spec.js

@@ -1045,10 +1045,10 @@ describe('Tooltip', () => {
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
 
-      tooltip.setContent()
-
       const tip = tooltip.getTipElement()
 
+      tooltip.setContent(tip)
+
       expect(tip.classList.contains('show')).toEqual(false)
       expect(tip.classList.contains('fade')).toEqual(false)
       expect(tip.querySelector('.tooltip-inner').textContent).toEqual('Another tooltip')