diff --git a/xml/tests/src/com/intellij/xml/XmlModificationsTest.java b/xml/tests/src/com/intellij/xml/XmlModificationsTest.java
new file mode 100644
index 000000000000..4c647e73d416
--- /dev/null
+++ b/xml/tests/src/com/intellij/xml/XmlModificationsTest.java
@@ -0,0 +1,45 @@
+// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package com.intellij.xml;
+
+import com.intellij.psi.XmlElementFactory;
+import com.intellij.psi.xml.XmlTag;
+import com.intellij.testFramework.PsiTestCase;
+
+public class XmlModificationsTest extends PsiTestCase {
+  private XmlElementFactory myFactory;
+
+  @Override
+  protected void setUp() throws Exception {
+    super.setUp();
+    myFactory = XmlElementFactory.getInstance(getProject());
+  }
+
+  @Override
+  public void tearDown() throws Exception {
+    myFactory = null;
+
+    super.tearDown();
+  }
+
+  public void testAddAttribute1() {
+    final XmlTag tag = myFactory.createTagFromText("<a></a>");
+    tag.setAttribute("b", "");
+    assertEquals("<a b=\"\"></a>", tag.getText());
+    tag.setAttribute("c", "");
+    assertEquals("<a b=\"\" c=\"\"></a>", tag.getText());
+  }
+
+  public void testAddAttribute2() {
+    final XmlTag tag = myFactory.createTagFromText("<a/>");
+    tag.setAttribute("b", "");
+    assertEquals("<a b=\"\"/>", tag.getText());
+    tag.setAttribute("c", "");
+    assertEquals("<a b=\"\" c=\"\"/>", tag.getText());
+  }
+
+  public void testAddSubTag1() {
+    final XmlTag tag = myFactory.createTagFromText("<a/>");
+    tag.add(tag.createChildTag("b", "", null, false));
+    assertEquals("<a><b/></a>", tag.getText());
+  }
+}