[ASTImporter] Add test for PackExpansionExpr

Reviewers: a.sidorin, a_sidorin

Reviewed By: a_sidorin

Subscribers: martong, cfe-commits

Differential Revision: https://reviews.llvm.org/D51142

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@340627 91177308-0d34-0410-b5e6-96231b3b80d8

test/Import/pack-expansion-expr/Inputs/F.cpp

@@ -0,0 +1,11 @@
+template <typename... T>
+void sink(T... a);
+
+template <typename... T>
+void packfuncT(T... a) {
+  sink(a...);
+}
+
+void f() {
+  packfuncT(1, 2, 3);
+}

test/Import/pack-expansion-expr/test.cpp

@@ -0,0 +1,12 @@
+// RUN: clang-import-test -dump-ast -import %S/Inputs/F.cpp -expression %s | FileCheck %s
+
+// CHECK: PackExpansionExpr
+// CHECK-SAME: '<dependent type>'
+// CHECK-NEXT: DeclRefExpr
+// CHECK-SAME: 'T...'
+// CHECK-SAME: ParmVar
+// CHECK-SAME: 'a'
+
+void expr() {
+  f();
+}