Add test for cpp_language_linkage

test/cpp_language_linkage.cpp

@@ -2,11 +2,60 @@
 // This file is subject to the license terms in the LICENSE file
 // found in the top-level directory of this distribution.
 
+#include <cppast/cpp_language_linkage.hpp>
+
+#include <cppast/cpp_enum.hpp>
+
 #include "test_parser.hpp"
 
 using namespace cppast;
 
 TEST_CASE("cpp_language_linkage")
 {
-    // TODO: need actual entities to parse
+    auto code = R"(
+extern "C" enum a {};
+
+enum b {};
+
+extern "C++" // yup
+{
+    enum c {};
+    enum d {};
+    enum e {};
+}
+
+enum f {};
+)";
+
+    auto file = parse({}, "cpp_language_linkage.cpp", code);
+
+    // check linkages
+    auto count = test_visit<cpp_language_linkage>(*file, [&](const cpp_language_linkage& linkage) {
+        if (linkage.name() == "\"C\"")
+            REQUIRE(!linkage.is_block());
+        else if (linkage.name() == "\"C++\"")
+            REQUIRE(linkage.is_block());
+        else
+            REQUIRE(false);
+    });
+    REQUIRE(count == 2u);
+
+    // check enums for their correct parent
+    count = test_visit<cpp_enum>(*file, [&](const cpp_enum& e) {
+        if (e.name() == "a")
+            check_parent(e, "\"C\"", "a");
+        else if (e.name() == "b")
+            check_parent(e, "cpp_language_linkage.cpp", "b");
+        else if (e.name() == "c")
+            check_parent(e, "\"C++\"", "c");
+        else if (e.name() == "d")
+            check_parent(e, "\"C++\"", "d");
+        else if (e.name() == "e")
+            check_parent(e, "\"C++\"", "e");
+        else if (e.name() == "f")
+            check_parent(e, "cpp_language_linkage.cpp", "f");
+        else
+            REQUIRE(false);
+    });
+    REQUIRE(count == 6u);
 }