Partial body resolve tests: more informative test output

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetPsiFactory.kt

@@ -30,6 +30,7 @@ import com.intellij.openapi.util.Key
 import java.io.PrintWriter
 import java.io.StringWriter
 import com.intellij.openapi.application.ApplicationManager
+import com.intellij.psi.PsiComment
 
 public fun JetPsiFactory(project: Project?): JetPsiFactory = JetPsiFactory(project!!)
 public fun JetPsiFactory(contextElement: JetElement): JetPsiFactory = JetPsiFactory(contextElement.getProject())
@@ -632,6 +633,14 @@ public class JetPsiFactory(private val project: Project) {
         return createClass("class foo { class object { } }").getClassObject()!!
     }
 
+    public fun createComment(text: String): PsiComment {
+        val file = createFile(text)
+        val comments = file.getChildren().filterIsInstance<PsiComment>()
+        val comment = comments.single()
+        assert(comment.getText() == text)
+        return comment
+    }
+
     public fun wrapInABlock(expression: JetExpression): JetBlockExpression {
         if (expression is JetBlockExpression) {
             return expression as JetBlockExpression