diff --git a/plugins/devkit/devkit-java-tests/testSrc/org/jetbrains/idea/devkit/navigation/DescriptionTypeRelatedItemLineMarkerProviderTest.java b/plugins/devkit/devkit-java-tests/testSrc/org/jetbrains/idea/devkit/navigation/DescriptionTypeRelatedItemLineMarkerProviderTest.java
index 44bd952a9b60..becddc77e803 100644
--- a/plugins/devkit/devkit-java-tests/testSrc/org/jetbrains/idea/devkit/navigation/DescriptionTypeRelatedItemLineMarkerProviderTest.java
+++ b/plugins/devkit/devkit-java-tests/testSrc/org/jetbrains/idea/devkit/navigation/DescriptionTypeRelatedItemLineMarkerProviderTest.java
@@ -16,13 +16,8 @@
 package org.jetbrains.idea.devkit.navigation;
 
 import com.intellij.codeInsight.daemon.GutterMark;
-import com.intellij.codeInspection.LocalInspectionEP;
 import com.intellij.icons.AllIcons;
 import com.intellij.testFramework.TestDataPath;
-import com.intellij.testFramework.builders.JavaModuleFixtureBuilder;
-import com.intellij.testFramework.fixtures.JavaCodeInsightFixtureTestCase;
-import com.intellij.ui.components.JBList;
-import com.intellij.util.PathUtil;
 import org.jetbrains.idea.devkit.DevkitJavaTestsUtil;
 
 import java.util.Collections;
@@ -30,21 +25,12 @@ import java.util.Comparator;
 import java.util.List;
 
 @TestDataPath("$CONTENT_ROOT/testData/navigation/descriptionType")
-public class DescriptionTypeRelatedItemLineMarkerProviderTest extends JavaCodeInsightFixtureTestCase {
-
+public class DescriptionTypeRelatedItemLineMarkerProviderTest extends DescriptionTypeRelatedItemLineMarkerProviderTestBase {
   @Override
   protected String getBasePath() {
     return DevkitJavaTestsUtil.TESTDATA_PATH + "navigation/descriptionType";
   }
 
-  @Override
-  protected void tuneFixture(JavaModuleFixtureBuilder moduleBuilder) {
-    String pathForClass = PathUtil.getJarPathForClass(LocalInspectionEP.class);
-    moduleBuilder.addLibrary("lang-api", pathForClass);
-    String platformApiJar = PathUtil.getJarPathForClass(JBList.class);
-    moduleBuilder.addLibrary("platform-api", platformApiJar);
-  }
-
   public void testInspectionDescription() {
     doTestInspectionDescription("MyWithDescriptionInspection.java", "MyWithDescription.html");
   }
@@ -53,12 +39,6 @@ public class DescriptionTypeRelatedItemLineMarkerProviderTest extends JavaCodeIn
     doTestInspectionDescription("MyWithDescriptionFromFieldReferenceInspection.java", "MyWithDescriptionFromFieldReferenceInspection.html");
   }
 
-  private void doTestInspectionDescription(String inspectionFile, String descriptionFile) {
-    myFixture.copyDirectoryToProject("inspectionDescriptions", "inspectionDescriptions");
-    GutterMark gutter = myFixture.findGutter(inspectionFile);
-    DevKitGutterTargetsChecker.checkGutterTargets(gutter, "Description", AllIcons.FileTypes.Html, descriptionFile);
-  }
-
   public void testIntentionDescription() {
     myFixture.copyDirectoryToProject("intentionDescriptions", "intentionDescriptions");
 
diff --git a/plugins/devkit/devkit-java-tests/testSrc/org/jetbrains/idea/devkit/navigation/ExtensionDeclarationRelatedItemLineMarkerProviderTest.java b/plugins/devkit/devkit-java-tests/testSrc/org/jetbrains/idea/devkit/navigation/ExtensionDeclarationRelatedItemLineMarkerProviderTest.java
index b0b9cce43f73..830ca6de15c5 100644
--- a/plugins/devkit/devkit-java-tests/testSrc/org/jetbrains/idea/devkit/navigation/ExtensionDeclarationRelatedItemLineMarkerProviderTest.java
+++ b/plugins/devkit/devkit-java-tests/testSrc/org/jetbrains/idea/devkit/navigation/ExtensionDeclarationRelatedItemLineMarkerProviderTest.java
@@ -15,66 +15,21 @@
  */
 package org.jetbrains.idea.devkit.navigation;
 
-import com.intellij.codeInsight.daemon.GutterMark;
-import com.intellij.icons.AllIcons;
-import com.intellij.openapi.extensions.ExtensionPointName;
-import com.intellij.openapi.module.Module;
-import com.intellij.openapi.module.ModuleUtilCore;
-import com.intellij.psi.PsiFile;
 import com.intellij.testFramework.TestDataPath;
-import com.intellij.testFramework.builders.JavaModuleFixtureBuilder;
-import com.intellij.testFramework.fixtures.JavaCodeInsightFixtureTestCase;
-import com.intellij.ui.ColorUtil;
-import com.intellij.ui.components.JBList;
-import com.intellij.util.PathUtil;
-import com.intellij.util.ui.UIUtil;
 import org.jetbrains.idea.devkit.DevkitJavaTestsUtil;
 
 @TestDataPath("$CONTENT_ROOT/testData/navigation/extensionDeclaration")
-public class ExtensionDeclarationRelatedItemLineMarkerProviderTest extends JavaCodeInsightFixtureTestCase {
-
+public class ExtensionDeclarationRelatedItemLineMarkerProviderTest extends ExtensionDeclarationRelatedItemLineMarkerProviderTestBase {
   @Override
   protected String getBasePath() {
     return DevkitJavaTestsUtil.TESTDATA_PATH + "navigation/extensionDeclaration";
   }
 
-  @Override
-  protected void tuneFixture(JavaModuleFixtureBuilder moduleBuilder) {
-    String extensionsJar = PathUtil.getJarPathForClass(ExtensionPointName.class);
-    moduleBuilder.addLibrary("extensions", extensionsJar);
-    String platformApiJar = PathUtil.getJarPathForClass(JBList.class);
-    moduleBuilder.addLibrary("platform-api", platformApiJar);
-  }
-
-
   public void testInvalidExtension() {
     doTestInvalidExtension("MyInvalidExtension.java");
   }
 
-  private void doTestInvalidExtension(String file) {
-    myFixture.configureByFile("plugin.xml");
-    assertNull(myFixture.findGutter(file));
-  }
-
-
   public void testExtension() {
     doTestExtension("MyExtension.java", "<myEp implementation=\"MyExtension\"/>");
   }
-
-  private void doTestExtension(String file, String xmlDeclarationText) {
-    PsiFile pluginXmlFile = myFixture.configureByFile("plugin.xml");
-    String pluginXmlPath = pluginXmlFile.getVirtualFile().getPath();
-
-    Module module = ModuleUtilCore.findModuleForPsiElement(pluginXmlFile);
-    assertNotNull(module);
-
-    String color = ColorUtil.toHex(UIUtil.getInactiveTextColor());
-    int expectedTagPosition = pluginXmlFile.getText().indexOf(xmlDeclarationText);
-    String expectedTooltip = "<html><body>&nbsp;&nbsp;&nbsp;&nbsp;<a href=\"#navigation/" + pluginXmlPath
-                             + ":" + expectedTagPosition + "\">myEp</a> declaration in plugin.xml " +
-                             "<font color=" + color + ">[" + module.getName() + "]</font><br></body></html>";
-
-    GutterMark gutter = myFixture.findGutter(file);
-    DevKitGutterTargetsChecker.checkGutterTargets(gutter, expectedTooltip, AllIcons.Nodes.Plugin, "myEp");
-  }
 }
diff --git a/plugins/devkit/devkit-kotlin-tests/testSrc/org/jetbrains/idea/devkit/kotlin/navigation/KtDescriptionTypeRelatedItemLineMarkerProviderTest.java b/plugins/devkit/devkit-kotlin-tests/testSrc/org/jetbrains/idea/devkit/kotlin/navigation/KtDescriptionTypeRelatedItemLineMarkerProviderTest.java
index 26cb8ddab617..3903a520a06b 100644
--- a/plugins/devkit/devkit-kotlin-tests/testSrc/org/jetbrains/idea/devkit/kotlin/navigation/KtDescriptionTypeRelatedItemLineMarkerProviderTest.java
+++ b/plugins/devkit/devkit-kotlin-tests/testSrc/org/jetbrains/idea/devkit/kotlin/navigation/KtDescriptionTypeRelatedItemLineMarkerProviderTest.java
@@ -1,41 +1,18 @@
 // 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 org.jetbrains.idea.devkit.kotlin.navigation;
 
-import com.intellij.codeInsight.daemon.GutterMark;
-import com.intellij.codeInspection.LocalInspectionEP;
-import com.intellij.icons.AllIcons;
 import com.intellij.testFramework.TestDataPath;
-import com.intellij.testFramework.builders.JavaModuleFixtureBuilder;
-import com.intellij.testFramework.fixtures.JavaCodeInsightFixtureTestCase;
-import com.intellij.ui.components.JBList;
-import com.intellij.util.PathUtil;
 import org.jetbrains.idea.devkit.kotlin.DevkitKtTestsUtil;
-import org.jetbrains.idea.devkit.navigation.DevKitGutterTargetsChecker;
+import org.jetbrains.idea.devkit.navigation.DescriptionTypeRelatedItemLineMarkerProviderTestBase;
 
-//TODO fix copy-paste
 @TestDataPath("$CONTENT_ROOT/testData/navigation/descriptionType")
-public class KtDescriptionTypeRelatedItemLineMarkerProviderTest extends JavaCodeInsightFixtureTestCase {
-
+public class KtDescriptionTypeRelatedItemLineMarkerProviderTest extends DescriptionTypeRelatedItemLineMarkerProviderTestBase {
   @Override
   protected String getBasePath() {
     return DevkitKtTestsUtil.TESTDATA_PATH + "navigation/descriptionType";
   }
 
-  @Override
-  protected void tuneFixture(JavaModuleFixtureBuilder moduleBuilder) {
-    String pathForClass = PathUtil.getJarPathForClass(LocalInspectionEP.class);
-    moduleBuilder.addLibrary("lang-api", pathForClass);
-    String platformApiJar = PathUtil.getJarPathForClass(JBList.class);
-    moduleBuilder.addLibrary("platform-api", platformApiJar);
-  }
-
   public void testKtInspectionDescription() {
     doTestInspectionDescription("MyKtWithDescriptionInspection.kt", "MyKtWithDescription.html");
   }
-
-  private void doTestInspectionDescription(String inspectionFile, String descriptionFile) {
-    myFixture.copyDirectoryToProject("inspectionDescriptions", "inspectionDescriptions");
-    GutterMark gutter = myFixture.findGutter(inspectionFile);
-    DevKitGutterTargetsChecker.checkGutterTargets(gutter, "Description", AllIcons.FileTypes.Html, descriptionFile);
-  }
 }
diff --git a/plugins/devkit/devkit-kotlin-tests/testSrc/org/jetbrains/idea/devkit/kotlin/navigation/KtExtensionDeclarationRelatedItemLineMarkerProviderTest.java b/plugins/devkit/devkit-kotlin-tests/testSrc/org/jetbrains/idea/devkit/kotlin/navigation/KtExtensionDeclarationRelatedItemLineMarkerProviderTest.java
index 304f32458d71..75857dc6f6d1 100644
--- a/plugins/devkit/devkit-kotlin-tests/testSrc/org/jetbrains/idea/devkit/kotlin/navigation/KtExtensionDeclarationRelatedItemLineMarkerProviderTest.java
+++ b/plugins/devkit/devkit-kotlin-tests/testSrc/org/jetbrains/idea/devkit/kotlin/navigation/KtExtensionDeclarationRelatedItemLineMarkerProviderTest.java
@@ -1,66 +1,22 @@
 // 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 org.jetbrains.idea.devkit.kotlin.navigation;
 
-import com.intellij.codeInsight.daemon.GutterMark;
-import com.intellij.icons.AllIcons;
-import com.intellij.openapi.extensions.ExtensionPointName;
-import com.intellij.openapi.module.Module;
-import com.intellij.openapi.module.ModuleUtilCore;
-import com.intellij.psi.PsiFile;
 import com.intellij.testFramework.TestDataPath;
-import com.intellij.testFramework.builders.JavaModuleFixtureBuilder;
-import com.intellij.testFramework.fixtures.JavaCodeInsightFixtureTestCase;
-import com.intellij.ui.ColorUtil;
-import com.intellij.ui.components.JBList;
-import com.intellij.util.PathUtil;
-import com.intellij.util.ui.UIUtil;
 import org.jetbrains.idea.devkit.kotlin.DevkitKtTestsUtil;
-import org.jetbrains.idea.devkit.navigation.DevKitGutterTargetsChecker;
+import org.jetbrains.idea.devkit.navigation.ExtensionDeclarationRelatedItemLineMarkerProviderTestBase;
 
-//TODO fix copy-paste
 @TestDataPath("$CONTENT_ROOT/testData/navigation/extensionDeclaration")
-public class KtExtensionDeclarationRelatedItemLineMarkerProviderTest extends JavaCodeInsightFixtureTestCase {
-
+public class KtExtensionDeclarationRelatedItemLineMarkerProviderTest extends ExtensionDeclarationRelatedItemLineMarkerProviderTestBase {
   @Override
   protected String getBasePath() {
     return DevkitKtTestsUtil.TESTDATA_PATH + "navigation/extensionDeclaration";
   }
 
-  @Override
-  protected void tuneFixture(JavaModuleFixtureBuilder moduleBuilder) {
-    String extensionsJar = PathUtil.getJarPathForClass(ExtensionPointName.class);
-    moduleBuilder.addLibrary("extensions", extensionsJar);
-    String platformApiJar = PathUtil.getJarPathForClass(JBList.class);
-    moduleBuilder.addLibrary("platform-api", platformApiJar);
-  }
-
   public void testInvalidKtExtension() {
     doTestInvalidExtension("MyInvalidKtExtension.kt");
   }
 
-  private void doTestInvalidExtension(String file) {
-    myFixture.configureByFile("plugin.xml");
-    assertNull(myFixture.findGutter(file));
-  }
-
   public void testKtExtension() {
     doTestExtension("MyKtExtension.kt", "<myEp implementation=\"MyKtExtension\"/>");
   }
-
-  private void doTestExtension(String file, String xmlDeclarationText) {
-    PsiFile pluginXmlFile = myFixture.configureByFile("plugin.xml");
-    String pluginXmlPath = pluginXmlFile.getVirtualFile().getPath();
-
-    Module module = ModuleUtilCore.findModuleForPsiElement(pluginXmlFile);
-    assertNotNull(module);
-
-    String color = ColorUtil.toHex(UIUtil.getInactiveTextColor());
-    int expectedTagPosition = pluginXmlFile.getText().indexOf(xmlDeclarationText);
-    String expectedTooltip = "<html><body>&nbsp;&nbsp;&nbsp;&nbsp;<a href=\"#navigation/" + pluginXmlPath
-                             + ":" + expectedTagPosition + "\">myEp</a> declaration in plugin.xml " +
-                             "<font color=" + color + ">[" + module.getName() + "]</font><br></body></html>";
-
-    GutterMark gutter = myFixture.findGutter(file);
-    DevKitGutterTargetsChecker.checkGutterTargets(gutter, expectedTooltip, AllIcons.Nodes.Plugin, "myEp");
-  }
 }
diff --git a/plugins/devkit/devkit-tests-api/src/org/jetbrains/idea/devkit/navigation/DescriptionTypeRelatedItemLineMarkerProviderTestBase.java b/plugins/devkit/devkit-tests-api/src/org/jetbrains/idea/devkit/navigation/DescriptionTypeRelatedItemLineMarkerProviderTestBase.java
new file mode 100644
index 000000000000..f4abb6c58f2f
--- /dev/null
+++ b/plugins/devkit/devkit-tests-api/src/org/jetbrains/idea/devkit/navigation/DescriptionTypeRelatedItemLineMarkerProviderTestBase.java
@@ -0,0 +1,27 @@
+// 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 org.jetbrains.idea.devkit.navigation;
+
+import com.intellij.codeInsight.daemon.GutterMark;
+import com.intellij.codeInspection.LocalInspectionEP;
+import com.intellij.icons.AllIcons;
+import com.intellij.testFramework.builders.JavaModuleFixtureBuilder;
+import com.intellij.testFramework.fixtures.JavaCodeInsightFixtureTestCase;
+import com.intellij.ui.components.JBList;
+import com.intellij.util.PathUtil;
+import org.jetbrains.annotations.NotNull;
+
+public abstract class DescriptionTypeRelatedItemLineMarkerProviderTestBase extends JavaCodeInsightFixtureTestCase {
+  @Override
+  protected void tuneFixture(JavaModuleFixtureBuilder moduleBuilder) {
+    String pathForClass = PathUtil.getJarPathForClass(LocalInspectionEP.class);
+    moduleBuilder.addLibrary("lang-api", pathForClass);
+    String platformApiJar = PathUtil.getJarPathForClass(JBList.class);
+    moduleBuilder.addLibrary("platform-api", platformApiJar);
+  }
+
+  protected void doTestInspectionDescription(@NotNull String inspectionFile, @NotNull String descriptionFile) {
+    myFixture.copyDirectoryToProject("inspectionDescriptions", "inspectionDescriptions");
+    GutterMark gutter = myFixture.findGutter(inspectionFile);
+    DevKitGutterTargetsChecker.checkGutterTargets(gutter, "Description", AllIcons.FileTypes.Html, descriptionFile);
+  }
+}
diff --git a/plugins/devkit/devkit-tests-api/src/org/jetbrains/idea/devkit/navigation/ExtensionDeclarationRelatedItemLineMarkerProviderTestBase.java b/plugins/devkit/devkit-tests-api/src/org/jetbrains/idea/devkit/navigation/ExtensionDeclarationRelatedItemLineMarkerProviderTestBase.java
new file mode 100644
index 000000000000..1983afeb4740
--- /dev/null
+++ b/plugins/devkit/devkit-tests-api/src/org/jetbrains/idea/devkit/navigation/ExtensionDeclarationRelatedItemLineMarkerProviderTestBase.java
@@ -0,0 +1,48 @@
+// 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 org.jetbrains.idea.devkit.navigation;
+
+import com.intellij.codeInsight.daemon.GutterMark;
+import com.intellij.icons.AllIcons;
+import com.intellij.openapi.extensions.ExtensionPointName;
+import com.intellij.openapi.module.Module;
+import com.intellij.openapi.module.ModuleUtilCore;
+import com.intellij.psi.PsiFile;
+import com.intellij.testFramework.builders.JavaModuleFixtureBuilder;
+import com.intellij.testFramework.fixtures.JavaCodeInsightFixtureTestCase;
+import com.intellij.ui.ColorUtil;
+import com.intellij.ui.components.JBList;
+import com.intellij.util.PathUtil;
+import com.intellij.util.ui.UIUtil;
+import org.jetbrains.annotations.NotNull;
+
+public abstract class ExtensionDeclarationRelatedItemLineMarkerProviderTestBase extends JavaCodeInsightFixtureTestCase {
+  @Override
+  protected void tuneFixture(JavaModuleFixtureBuilder moduleBuilder) {
+    String extensionsJar = PathUtil.getJarPathForClass(ExtensionPointName.class);
+    moduleBuilder.addLibrary("extensions", extensionsJar);
+    String platformApiJar = PathUtil.getJarPathForClass(JBList.class);
+    moduleBuilder.addLibrary("platform-api", platformApiJar);
+  }
+
+  protected void doTestExtension(@NotNull String file, @NotNull String xmlDeclarationText) {
+    PsiFile pluginXmlFile = myFixture.configureByFile("plugin.xml");
+    String pluginXmlPath = pluginXmlFile.getVirtualFile().getPath();
+
+    Module module = ModuleUtilCore.findModuleForPsiElement(pluginXmlFile);
+    assertNotNull(module);
+
+    String color = ColorUtil.toHex(UIUtil.getInactiveTextColor());
+    int expectedTagPosition = pluginXmlFile.getText().indexOf(xmlDeclarationText);
+    String expectedTooltip = "<html><body>&nbsp;&nbsp;&nbsp;&nbsp;<a href=\"#navigation/" + pluginXmlPath
+                             + ":" + expectedTagPosition + "\">myEp</a> declaration in plugin.xml " +
+                             "<font color=" + color + ">[" + module.getName() + "]</font><br></body></html>";
+
+    GutterMark gutter = myFixture.findGutter(file);
+    DevKitGutterTargetsChecker.checkGutterTargets(gutter, expectedTooltip, AllIcons.Nodes.Plugin, "myEp");
+  }
+
+  protected void doTestInvalidExtension(@NotNull String file) {
+    myFixture.configureByFile("plugin.xml");
+    assertNull(myFixture.findGutter(file));
+  }
+}