test for stuff that Max has already implemented

idea/testData/codegen/newInstanceDefaultConstructor.jet

@@ -0,0 +1,8 @@
+class SimpleClass() {
+    fun foo() = 610
+}
+
+fun test() {
+  val c = new SimpleClass()
+  return c.foo()
+}

idea/testData/codegen/newInstanceExplicitConstructor.jet

@@ -0,0 +1,10 @@
+class SimpleClass {
+    this() {}
+
+    fun foo() = 610
+}
+
+fun test() {
+  val c = new SimpleClass()
+  return c.foo()
+}

idea/tests/org/jetbrains/jet/codegen/ClassGenTest.java

@@ -24,10 +24,20 @@ public class ClassGenTest extends CodegenTestCase {
         checkInterface(aClass, List.class);
     }
 
-    private void checkInterface(Class aClass, Class ifs) {
+    private static void checkInterface(Class aClass, Class ifs) {
         for (Class anInterface : aClass.getInterfaces()) {
             if (anInterface == ifs) return;
         }
         fail(aClass.getName() + " must have " + ifs.getName() + " in its interfaces");
     }
+
+    public void testNewInstanceExplicitConstructor() throws Exception {
+        loadFile("newInstanceDefaultConstructor.jet");
+        final Codegens codegens = generateClassesInFile();
+        loadImplementationClass(codegens, "SimpleClass");
+        Class ns = loadRootNamespaceClass(codegens);
+        final Method method = findMethodByName(ns, "test");
+        final Integer returnValue = (Integer) method.invoke(null);
+        assertEquals(610, returnValue.intValue());
+    }
 }

idea/tests/org/jetbrains/jet/codegen/CodegenTestCase.java

@@ -60,10 +60,14 @@ public abstract class CodegenTestCase extends LightCodeInsightFixtureTestCase {
     }
 
     protected Class generateNamespaceClass() {
+        Codegens state = generateClassesInFile();
+        return loadRootNamespaceClass(state);
+    }
+
+    protected Class loadRootNamespaceClass(Codegens state) {
         JetFile jetFile = (JetFile) myFixture.getFile();
         final JetNamespace namespace = jetFile.getRootNamespace();
         String fqName = NamespaceCodegen.getJVMClassName(namespace.getFQName()).replace("/", ".");
-        Codegens state = generateClassesInFile();
         return loadClass(fqName, state);
     }