1 files changed, 57 insertions, 0 deletions
diff --git a/test/core/transport/chttp2/alpn_test.cc b/test/core/transport/chttp2/alpn_test.cc
new file mode 100644
index 0000000000..a43377393e
--- /dev/null
+++ b/test/core/transport/chttp2/alpn_test.cc
@@ -0,0 +1,57 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include "src/core/ext/transport/chttp2/alpn/alpn.h"
+
+#include <grpc/support/log.h>
+#include "test/core/util/test_config.h"
+
+static void test_alpn_success(void) {
+  GPR_ASSERT(grpc_chttp2_is_alpn_version_supported("h2", 2));
+  GPR_ASSERT(grpc_chttp2_is_alpn_version_supported("grpc-exp", 8));
+}
+
+static void test_alpn_failure(void) {
+  GPR_ASSERT(!grpc_chttp2_is_alpn_version_supported("h2-155", 6));
+  GPR_ASSERT(!grpc_chttp2_is_alpn_version_supported("h1-15", 5));
+}
+
+// First index in ALPN supported version list of a given protocol. Returns a
+// value one beyond the last valid element index if not found.
+static size_t alpn_version_index(const char* version, size_t size) {
+  size_t i;
+  for (i = 0; i < grpc_chttp2_num_alpn_versions(); ++i) {
+    if (!strncmp(version, grpc_chttp2_get_alpn_version_index(i), size)) {
+      return i;
+    }
+  }
+  return i;
+}
+
+static void test_alpn_grpc_before_h2(void) {
+  // grpc-exp is preferred over h2.
+  GPR_ASSERT(alpn_version_index("grpc-exp", 8) < alpn_version_index("h2", 2));
+}
+
+int main(int argc, char** argv) {
+  grpc_test_init(argc, argv);
+  test_alpn_success();
+  test_alpn_failure();
+  test_alpn_grpc_before_h2();
+  return 0;
+}