[ASTImporter] Add test for importing anonymous namespaces.

Reviewers: a.sidorin, a_sidorin

Reviewed By: a_sidorin

Subscribers: a_sidorin, martong, cfe-commits

Differential Revision: https://reviews.llvm.org/D51178

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@351739 91177308-0d34-0410-b5e6-96231b3b80d8

test/Import/cxx-anon-namespace/Inputs/F.cpp

@@ -0,0 +1,25 @@
+namespace {
+void func1() {
+}
+} // namespace
+
+namespace test_namespace1 {
+namespace {
+void func2() {}
+} // namespace
+} // namespace test_namespace1
+
+namespace test_namespace2 {
+namespace {
+namespace test_namespace3 {
+void func3() {}
+} // namespace test_namespace3
+} // namespace
+} // namespace test_namespace2
+
+namespace {
+namespace {
+void func4() {
+}
+} // namespace
+} // namespace

test/Import/cxx-anon-namespace/test.cpp

@@ -0,0 +1,45 @@
+// RUN: clang-import-test -dump-ast -import %S/Inputs/F.cpp -expression %s | FileCheck %s
+
+// The implicit UsingDirectiveDecls for the anonymous namespaces are created by the Sema.
+
+// CHECK: NamespaceDecl
+// The nested anonymous namespace.
+// CHECK-NEXT: NamespaceDecl
+// CHECK: FunctionDecl
+// CHECK-SAME: func4
+// CHECK-NEXT: CompoundStmt
+// This is for the nested anonymous namespace.
+// CHECK-NEXT: UsingDirectiveDecl
+// CHECK-SAME: ''
+// CHECK: FunctionDecl
+// CHECK-SAME: func1
+// CHECK-NEXT: CompoundStmt
+// CHECK-NEXT: UsingDirectiveDecl
+// CHECK-SAME: ''
+
+// CHECK: NamespaceDecl
+// CHECK-SAME: test_namespace1
+// CHECK-NEXT: NamespaceDecl
+// CHECK: FunctionDecl
+// CHECK-SAME: func2
+// CHECK-NEXT: CompoundStmt
+// CHECK-NEXT: UsingDirectiveDecl
+// CHECK-SAME: ''
+
+// CHECK-NEXT: NamespaceDecl
+// CHECK-SAME: test_namespace2
+// CHECK-NEXT: NamespaceDecl
+// CHECK-NEXT: NamespaceDecl
+// CHECK-SAME: test_namespace3
+// CHECK: FunctionDecl
+// CHECK-SAME: func3
+// CHECK-NEXT: CompoundStmt
+// CHECK-NEXT: UsingDirectiveDecl
+// CHECK-SAME: ''
+
+void expr() {
+  func1();
+  test_namespace1::func2();
+  test_namespace2::test_namespace3::func3();
+  func4();
+}