Added test for abstract-classes

tests/cases/compiler/abstractClass1.ts

@@ -0,0 +1,36 @@
+// @declaration: true
+
+abstract class Foo {
+    constructor(f: any) { }
+    public static bar(): void { }
+
+    public empty() { }
+}
+
+class Bar extends Foo {
+    constructor(f: any) {
+        super(f);
+    }
+}
+
+var a = new Foo(1); // Error
+var b = new Foo(); // Error because of invalid constructor arguments
+
+module baz {
+    export abstract class Qux {
+    }
+    export class Quz extends Qux {
+    }
+}
+
+new baz.Qux();
+
+// Valid
+var c = new Bar(1);
+c.empty();
+
+// Calling a static method on a abstract class is valid
+Foo.bar();
+
+var Copy = Foo;
+new Copy();

tests/cases/compiler/abstractClassIdentifierName.ts

@@ -0,0 +1,4 @@
+class abstract {
+
+    abstract(): void { }
+}

tests/cases/compiler/abstractIdentifierNameStrict.ts

@@ -0,0 +1,6 @@
+var abstract = true;
+
+function foo() {
+    "use strict";
+    var abstract = true;
+}

tests/cases/compiler/abstractInterfaceIdentifierName.ts

@@ -0,0 +1,4 @@
+
+interface abstract {
+    abstract(): void;
+}