[Fixes #15953] Implement assert.expect in each unit test

[Fixes #15953] Implement `assert.expect` in each unit test

js/tests/unit/alert.js

@@ -4,6 +4,7 @@ $(function () {
   QUnit.module('alert plugin')
 
   QUnit.test('should be defined on jquery object', function (assert) {
+    assert.expect(1)
     assert.ok($(document.body).alert, 'alert method is defined')
   })
 
@@ -19,10 +20,12 @@ $(function () {
   })
 
   QUnit.test('should provide no conflict', function (assert) {
+    assert.expect(1)
     assert.strictEqual($.fn.alert, undefined, 'alert was set back to undefined (org value)')
   })
 
   QUnit.test('should return jquery collection containing the element', function (assert) {
+    assert.expect(2)
     var $el = $('<div/>')
     var $alert = $el.bootstrapAlert()
     assert.ok($alert instanceof $, 'returns jquery collection')
@@ -30,6 +33,7 @@ $(function () {
   })
 
   QUnit.test('should fade element out on clicking .close', function (assert) {
+    assert.expect(1)
     var alertHTML = '<div class="alert alert-danger fade in">'
         + '<a class="close" href="#" data-dismiss="alert">×</a>'
         + '<p><strong>Holy guacamole!</strong> Best check yo self, you\'re not looking too good.</p>'
@@ -42,6 +46,7 @@ $(function () {
   })
 
   QUnit.test('should remove element when clicking .close', function (assert) {
+    assert.expect(2)
     var alertHTML = '<div class="alert alert-danger fade in">'
         + '<a class="close" href="#" data-dismiss="alert">×</a>'
         + '<p><strong>Holy guacamole!</strong> Best check yo self, you\'re not looking too good.</p>'
@@ -56,6 +61,7 @@ $(function () {
   })
 
   QUnit.test('should not fire closed when close is prevented', function (assert) {
+    assert.expect(1)
     var done = assert.async()
     $('<div class="alert"/>')
       .on('close.bs.alert', function (e) {