notify about refs to foreign types (IDEA-145186)

java/java-tests/testData/inspection/unusedLibrary/usedJunitFromField/expected.xml

@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<problems/>
+

java/java-tests/testData/inspection/unusedLibrary/usedJunitFromField/src/MyTest.java

@@ -0,0 +1,4 @@
+import junit.framework.TestCase;
+public class MyTest {
+  TestCase myTestCase;
+}

java/java-tests/testSrc/com/intellij/codeInspection/UnusedLibraryInspectionTest.java

@@ -49,7 +49,7 @@ public class UnusedLibraryInspectionTest extends InspectionTestCase {
   @Override
   protected void setupRootModel(String testDir, VirtualFile[] sourceDir, String sdkName) {
     super.setupRootModel(testDir, sourceDir, sdkName);
-    PsiTestUtil.addLibrary(getModule(), "JUnit", getTestDataPath() + "/junit.jar");
+    PsiTestUtil.addLibrary(getModule(), "JUnit", getTestDataPath(), "/junit.jar");
   }
 
   private void doTest() throws Exception {
@@ -63,4 +63,6 @@ public class UnusedLibraryInspectionTest extends InspectionTestCase {
   }
 
   public void testSimple() throws Exception { doTest(); }
+  public void testUsedJunit() throws Exception { doTest(); }
+  public void testUsedJunitFromField() throws Exception { doTest(); }
 }