Add CTS test

Taken from intel#17709

Co-authored-by:  Mikołaj Komar <[email protected]>

Author: EwanC

sycl/source/detail/graph_impl.cpp

@@ -985,9 +985,9 @@ exec_graph_impl::enqueue(const std::shared_ptr<sycl::detail::queue_impl> &Queue,
       // and potential hangs. We have therefore to expliclty wait in the host
       // for previous submission to complete before resubmitting the
       // command-buffer for level-zero backend.
-      // TODO : add a check to release this constraint and allow multiple
-      // concurrent submissions if the exec_graph has been updated since the
-      // last submission.
+      // TODO https://github.com/intel/llvm/issues/17734
+      // Remove this backend specific behavior and allow multiple concurrent
+      // submissions of the UR command-buffer.
       for (std::vector<sycl::detail::EventImplPtr>::iterator It =
                MExecutionEvents.begin();
            It != MExecutionEvents.end();) {

unified-runtime/test/conformance/exp_command_buffer/fill.cpp

@@ -122,6 +122,31 @@ TEST_P(urCommandBufferFillCommandsTest, Buffer) {
   verifyData(output, size);
 }
 
+TEST_P(urCommandBufferFillCommandsTest, ExecuteTwice) {
+  // TODO https://github.com/intel/llvm/issues/17734
+  // Fail on Level-Zero due to blocking wait code in graph_impl.cpp specific
+  // to the level-zero backend that needs moved into the Level-Zero v1 adapter.
+  UUR_KNOWN_FAILURE_ON(uur::LevelZero{});
+  ASSERT_SUCCESS(urCommandBufferAppendMemBufferFillExp(
+      cmd_buf_handle, buffer, pattern.data(), pattern_size, 0, size, 0, nullptr,
+      0, nullptr, &sync_point, nullptr, nullptr));
+
+  std::vector<uint8_t> output(size, 1);
+  ASSERT_SUCCESS(urCommandBufferAppendMemBufferReadExp(
+      cmd_buf_handle, buffer, 0, size, output.data(), 1, &sync_point, 0,
+      nullptr, nullptr, nullptr, nullptr));
+
+  ASSERT_SUCCESS(urCommandBufferFinalizeExp(cmd_buf_handle));
+
+  ASSERT_SUCCESS(
+      urEnqueueCommandBufferExp(queue, cmd_buf_handle, 0, nullptr, nullptr));
+  ASSERT_SUCCESS(
+      urEnqueueCommandBufferExp(queue, cmd_buf_handle, 0, nullptr, nullptr));
+  ASSERT_SUCCESS(urQueueFinish(queue));
+
+  verifyData(output, size);
+}
+
 TEST_P(urCommandBufferFillCommandsTest, USM) {
   ASSERT_SUCCESS(urCommandBufferAppendUSMFillExp(
       cmd_buf_handle, device_ptr, pattern.data(), pattern_size, size, 0,