fixed more tests for headless environment

platform/lvcs-impl/testSrc/com/intellij/history/integration/ui/LocalHistoryUITestCase.java

@@ -18,12 +18,10 @@ package com.intellij.history.integration.ui;
 
 import com.intellij.history.integration.IntegrationTestCase;
 
-import java.awt.*;
-
 public abstract class LocalHistoryUITestCase extends IntegrationTestCase {
   @Override
   protected void runTest() throws Throwable {
-    if (GraphicsEnvironment.isHeadless()) {
+    if (isInHeadlessEnvironment()) {
       System.out.println("Test '" + getClass().getName() + "." + getName() + "' is skipped because it requires working UI environment");
       return;
     }

platform/testFramework/src/com/intellij/testFramework/PlatformTestCase.java

@@ -76,6 +76,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import javax.swing.*;
+import java.awt.*;
 import java.io.File;
 import java.io.IOException;
 import java.lang.annotation.ElementType;
@@ -202,6 +203,10 @@ public abstract class PlatformTestCase extends UsefulTestCase implements DataPro
     runStartupActivities();
   }
 
+  protected static boolean isInHeadlessEnvironment() {
+    return GraphicsEnvironment.isHeadless();
+  }
+
   @NotNull
   public static Project createProject(File projectFile, String creationPlace) {
     try {