mdbx-test: смена расширения у C++ исходников.

test/try.c++

@@ -0,0 +1,28 @@
+#include "test.h++"
+
+class testcase_try : public testcase {
+public:
+  testcase_try(const actor_config &config, const mdbx_pid_t pid)
+      : testcase(config, pid) {}
+  bool run() override;
+};
+REGISTER_TESTCASE(try);
+
+bool testcase_try::run() {
+  db_open();
+  assert(!txn_guard);
+
+  MDBX_txn *txn = nullptr;
+  MDBX_txn *txn2 = nullptr;
+  int rc = mdbx_txn_begin(db_guard.get(), nullptr, MDBX_TXN_READWRITE, &txn);
+  if (unlikely(rc != MDBX_SUCCESS))
+    failure_perror("mdbx_txn_begin(MDBX_TXN_TRY)", rc);
+  else {
+    rc = mdbx_txn_begin(db_guard.get(), nullptr, MDBX_TXN_TRY, &txn2);
+    if (unlikely(rc != MDBX_BUSY))
+      failure_perror("mdbx_txn_begin(MDBX_TXN_TRY)", rc);
+  }
+
+  txn_guard.reset(txn);
+  return true;
+}