v4 improve coverage (#25945)

* Improve code coverage for our Button plugin

* improve coverage for our Alert plugin

* test tooltip update method

* test update and dispose for dropdown

* increase code coverage requirements

1 files changed, 112 insertions, 0 deletions

diff --git a/js/tests/unit/dropdown.js b/js/tests/unit/dropdown.js
index 0e3d37041..726655e9c 100644
--- a/js/tests/unit/dropdown.js
+++ b/js/tests/unit/dropdown.js
@@ -940,4 +940,116 @@ $(function () {
 
     $dropdown.trigger('click')
   })
+
+  QUnit.test('should call Popper.js and detect navbar on update', function (assert) {
+    assert.expect(3)
+
+    var dropdownHTML =
+      '<div class="dropdown">' +
+      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
+      '  <div class="dropdown-menu">' +
+      '    <a class="dropdown-item" href="#">Another link</a>' +
+      '  </div>' +
+      '</div>'
+
+    var $dropdown = $(dropdownHTML)
+      .appendTo('#qunit-fixture')
+      .find('[data-toggle="dropdown"]')
+      .bootstrapDropdown()
+
+    var dropdown = $dropdown.data('bs.dropdown')
+    dropdown.toggle()
+    assert.ok(dropdown._popper)
+
+    var spyPopper = sinon.spy(dropdown._popper, 'scheduleUpdate')
+    var spyDetectNavbar = sinon.spy(dropdown, '_detectNavbar')
+    dropdown.update()
+
+    assert.ok(spyPopper.called)
+    assert.ok(spyDetectNavbar.called)
+  })
+
+  QUnit.test('should just detect navbar on update', function (assert) {
+    assert.expect(2)
+
+    var dropdownHTML =
+      '<div class="dropdown">' +
+      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
+      '  <div class="dropdown-menu">' +
+      '    <a class="dropdown-item" href="#">Another link</a>' +
+      '  </div>' +
+      '</div>'
+
+    var $dropdown = $(dropdownHTML)
+      .appendTo('#qunit-fixture')
+      .find('[data-toggle="dropdown"]')
+      .bootstrapDropdown()
+
+    var dropdown = $dropdown.data('bs.dropdown')
+    var spyDetectNavbar = sinon.spy(dropdown, '_detectNavbar')
+
+    dropdown.update()
+
+    assert.notOk(dropdown._popper)
+    assert.ok(spyDetectNavbar.called)
+  })
+
+  QUnit.test('should dispose dropdown with Popper', function (assert) {
+    assert.expect(6)
+
+    var dropdownHTML =
+      '<div class="dropdown">' +
+      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
+      '  <div class="dropdown-menu">' +
+      '    <a class="dropdown-item" href="#">Another link</a>' +
+      '  </div>' +
+      '</div>'
+
+    var $dropdown = $(dropdownHTML)
+      .appendTo('#qunit-fixture')
+      .find('[data-toggle="dropdown"]')
+      .bootstrapDropdown()
+
+    var dropdown = $dropdown.data('bs.dropdown')
+    dropdown.toggle()
+
+    assert.ok(dropdown._popper)
+    assert.ok(dropdown._menu !== null)
+    assert.ok(dropdown._element !== null)
+    var spyDestroy = sinon.spy(dropdown._popper, 'destroy')
+
+    dropdown.dispose()
+
+    assert.ok(spyDestroy.called)
+    assert.ok(dropdown._menu === null)
+    assert.ok(dropdown._element === null)
+  })
+
+  QUnit.test('should dispose dropdown', function (assert) {
+    assert.expect(5)
+
+    var dropdownHTML =
+      '<div class="dropdown">' +
+      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
+      '  <div class="dropdown-menu">' +
+      '    <a class="dropdown-item" href="#">Another link</a>' +
+      '  </div>' +
+      '</div>'
+
+    var $dropdown = $(dropdownHTML)
+      .appendTo('#qunit-fixture')
+      .find('[data-toggle="dropdown"]')
+      .bootstrapDropdown()
+
+    var dropdown = $dropdown.data('bs.dropdown')
+
+    assert.notOk(dropdown._popper)
+    assert.ok(dropdown._menu !== null)
+    assert.ok(dropdown._element !== null)
+
+    dropdown.dispose()
+
+    assert.ok(dropdown._menu === null)
+    assert.ok(dropdown._element === null)
+  })
 })