test: add transport module unit tests; docs: update README (#39, #119)

tests/test_transport_tls.c

@@ -0,0 +1,24 @@
+#include "test_transport_tls.h"
+#include "test_utils.h"
+#include "transport_tcp.h"
+#include "transport_tls.h"
+
+static void test_tls_global_init() {
+  bool ok = tls_global_init();
+  EXPECT_TRUE(ok);
+}
+
+static void test_server_create_tls_without_certs() {
+  Server* s = server_create(0);
+  EXPECT_NOT_NULL(s);
+  bool ok = server_create_tls(s, NULL, NULL, NULL);
+  EXPECT_TRUE(ok);
+  EXPECT_NOT_NULL(s->ssl_ctx);
+  server_delete(&s);
+  EXPECT_NULL(s);
+}
+
+void test_transport_tls() {
+  test_tls_global_init();
+  test_server_create_tls_without_certs();
+}