CDRIVER-4656 check if server is running with TLS in tests (#1702)

* CDRIVER-4656 skip test if server is not started with TLS

* add `test_framework_skip_if_no_server_ssl`

Author: kevinAlbs

src/libmongoc/tests/test-libmongoc.c

@@ -2624,3 +2624,12 @@ test_framework_is_loadbalanced (void)
    return test_framework_getenv_bool ("MONGOC_TEST_LOADBALANCED") ||
           test_framework_getenv_bool ("MONGOC_TEST_DNS_LOADBALANCED");
 }
+
+int
+test_framework_skip_if_no_server_ssl (void)
+{
+   if (test_framework_get_ssl ()) {
+      return 1; // Proceed.
+   }
+   return 0; // Skip.
+}

src/libmongoc/tests/test-libmongoc.h

@@ -284,4 +284,8 @@ test_framework_skip_if_serverless (void);
 bool
 test_framework_is_loadbalanced (void);
 
+// `test_framework_skip_if_no_server_ssl` skips if test runner was not told to connect to the server with SSL.
+int
+test_framework_skip_if_no_server_ssl (void);
+
 #endif

src/libmongoc/tests/test-mongoc-client.c

@@ -2222,8 +2222,9 @@ test_client_buildinfo_hang (void)
 #if defined(MONGOC_ENABLE_SSL_OPENSSL)
 
 static void
-test_mongoc_client_change_openssl_ctx_before_ops (void)
+test_mongoc_client_change_openssl_ctx_before_ops (void *unused)
 {
+   BSON_UNUSED (unused);
    mongoc_client_t *client;
    const mongoc_ssl_opt_t *ssl_opts;
    bson_error_t error;
@@ -2243,8 +2244,9 @@ test_mongoc_client_change_openssl_ctx_before_ops (void)
 }
 
 static void
-test_mongoc_client_change_openssl_ctx_between_ops (void)
+test_mongoc_client_change_openssl_ctx_between_ops (void *unused)
 {
+   BSON_UNUSED (unused);
    mongoc_client_t *client;
    const mongoc_ssl_opt_t *ssl_opts;
    bson_error_t error;
@@ -4139,9 +4141,17 @@ test_client_install (TestSuite *suite)
       suite, "/Client/resends_handshake_on_network_error", test_mongoc_client_resends_handshake_on_network_error);
    TestSuite_Add (suite, "/Client/failure_to_auth", test_failure_to_auth);
 #if defined(MONGOC_ENABLE_SSL_OPENSSL)
-   TestSuite_Add (
-      suite, "/Client/openssl/change_ssl_opts_before_ops", test_mongoc_client_change_openssl_ctx_before_ops);
-   TestSuite_Add (
-      suite, "/Client/openssl/change_ssl_opts_after_ops", test_mongoc_client_change_openssl_ctx_between_ops);
+   TestSuite_AddFull (suite,
+                      "/Client/openssl/change_ssl_opts_before_ops",
+                      test_mongoc_client_change_openssl_ctx_before_ops,
+                      NULL,
+                      NULL,
+                      test_framework_skip_if_no_server_ssl);
+   TestSuite_AddFull (suite,
+                      "/Client/openssl/change_ssl_opts_after_ops",
+                      test_mongoc_client_change_openssl_ctx_between_ops,
+                      NULL,
+                      NULL,
+                      test_framework_skip_if_no_server_ssl);
 #endif
 }