Added tests.

Author: DanielRosenwasser

tests/cases/conformance/types/tuple/emptyTuples/emptyTuplesTypeAssertion01.ts

@@ -0,0 +1,4 @@
+// @declaration: true
+
+let x = <[]>[];
+let y = x[0];

tests/cases/conformance/types/tuple/emptyTuples/emptyTuplesTypeAssertion02.ts

@@ -0,0 +1,4 @@
+// @declaration: true
+
+let x = [] as [];
+let y = x[0];