restore composer.json, add mysqli extension

public/vendor/editor/test/base/module/Placeholder.spec.js

@@ -0,0 +1,31 @@
+/**
+ * Placeholder.spec.js
+ * (c) 2015~ Summernote Team
+ * summernote may be freely distributed under the MIT license./
+ */
+import chai from 'chai';
+import $ from 'jquery';
+import Context from 'src/js/base/Context';
+import 'src/js/bs4/settings';
+
+describe('Placeholder', () => {
+  var assert = chai.assert;
+
+  it('should not be initialized by placeholder attribute without inheritPlaceHolder', () => {
+    var options = $.extend({}, $.summernote.options);
+    var context = new Context($('<textarea placeholder="custom_placeholder"><p>hello</p></textarea>'), options);
+    var $editor = context.layoutInfo.editor;
+
+    assert.isTrue($editor.find('.note-placeholder').length === 0);
+  });
+
+  it('should be initialized by placeholder attribute with inheritPlaceHolder', () => {
+    var options = $.extend({}, $.summernote.options);
+    options.inheritPlaceholder = true;
+    var context = new Context($('<textarea placeholder="custom_placeholder"><p>hello</p></textarea>'), options);
+    var $editor = context.layoutInfo.editor;
+
+    assert.isTrue($editor.find('.note-placeholder').length === 1);
+    assert.isTrue($editor.find('.note-placeholder').html() === 'custom_placeholder');
+  });
+});