Add tests

tests/cases/fourslash/semanticClassificationClassExpression.ts

@@ -0,0 +1,12 @@
+/// <reference path="fourslash.ts"/>
+
+//// var x = class /*0*/C {}
+//// class /*1*/C {}
+//// class /*2*/D extends class /*3*/B{} { }
+var c = classification;
+verify.semanticClassificationsAre(
+    c.className("C", test.marker("0").position),
+    c.className("C", test.marker("1").position),
+    c.className("D", test.marker("2").position),
+    c.className("B", test.marker("3").position)
+);