Bug 91081 [quick fix] Quick complete should introspect method change when return val from method
org.eclipse.jdt.ui.tests/ui/org/eclipse/jdt/ui/tests/quickfix/ReturnTypeQuickFixTest.java
buf.append("package test1;\n");
		buf.append("import java.util.Vector;\n");
		buf.append("public class E {\n");
		buf.append("    Vector fList= new Vector();\n");
		buf.append("    public void elements() {\n");
		buf.append("        return fList.toArray();\n");
		buf.append("    }\n");
		buf.append("}\n");
		ICompilationUnit cu= pack1.createCompilationUnit("E.java", buf.toString(), false, null);
		
		CompilationUnit astRoot= getASTRoot(cu);
		ArrayList proposals= collectCorrections(cu, astRoot);
		assertNumberOfProposals(proposals, 2);
		assertCorrectLabels(proposals);
			
		{	
			ASTRewriteCorrectionProposal proposal= (ASTRewriteCorrectionProposal) proposals.get(0);
			String preview= getPreviewContent(proposal);
		
			buf= new StringBuffer();
			buf.append("package test1;\n");
			buf.append("import java.util.Vector;\n");
			buf.append("public class E {\n");
			buf.append("    Vector fList= new Vector();\n");
			buf.append("    public Object[] elements() {\n");
			buf.append("        return fList.toArray();\n");
			buf.append("    }\n");
			buf.append("}\n");
			assertEqualString(preview, buf.toString());
		}