Another small batch of Junit test for errors in the resolver

compiler/javatests/com/google/dart/compiler/resolver/ResolverTestCase.java

Index: compiler/javatests/com/google/dart/compiler/resolver/ResolverTestCase.java
diff --git a/compiler/javatests/com/google/dart/compiler/resolver/ResolverTestCase.java b/compiler/javatests/com/google/dart/compiler/resolver/ResolverTestCase.java
index 8bb5228eaf8b395b88ea0ea2081e3e38d1fd87d3..a683c4c39059af0f02bbf15110b03a2b749510e5 100644
--- a/compiler/javatests/com/google/dart/compiler/resolver/ResolverTestCase.java
+++ b/compiler/javatests/com/google/dart/compiler/resolver/ResolverTestCase.java
@@ -182,6 +182,7 @@ abstract class ResolverTestCase extends TestCase {
     private final InterfaceType dynamicType;
     private final InterfaceType defaultMapLiteralType;
     private final InterfaceType defaultListType;
+    private final Type voidType;
     private final ClassElement objectElement;
 
     {
@@ -221,6 +222,8 @@ abstract class ResolverTestCase extends TestCase {
       ClassElement listElement = Elements.classNamed("List");
       defaultListType = Types.interfaceType(listElement, Lists.<Type>newArrayList(dynamicType));
       listElement.setType(defaultListType);
+
+      voidType = Types.newVoidType();
     }
 
     MockCoreTypeProvider(ClassElement objectElement) {
@@ -269,7 +272,7 @@ abstract class ResolverTestCase extends TestCase {
 
     @Override
     public Type getVoidType() {
-      throw new AssertionError();
+      return voidType;
     }
 
     @Override
@@ -482,8 +485,8 @@ abstract class ResolverTestCase extends TestCase {
     checkExpectedErrors(resolveErrors, errorCodes, source);
     return resolveErrors;
   }
-  
-  protected List<DartCompilationError> resolveAndTest(String source, 
+
+  protected List<DartCompilationError> resolveAndTest(String source,
                                                       ErrorExpectation... expectedErrors) {
     // parse DartUnit
     DartUnit unit = parseUnit(source);