Add a test for information queries of dummy events (#201)

Author: sergey-semenov

SYCL/Regression/dummy_event_info.cpp

@@ -0,0 +1,24 @@
+// RUN: %clangxx -fsycl %s -o %t.out
+// RUN: %CPU_RUN_PLACEHOLDER %t.out
+
+#include <CL/sycl.hpp>
+
+#include <cassert>
+
+using namespace sycl;
+
+// Check that information queries for dummy non-host events (e.g. USM operations
+// for 0 bytes) work correctly.
+int main() {
+  queue q{{property::queue::enable_profiling()}};
+  event e = q.memcpy(nullptr, nullptr, 0);
+
+  assert(e.get_info<info::event::command_execution_status>() ==
+         info::event_command_status::complete);
+  assert(e.get_info<info::event::reference_count>() == 0);
+  assert(e.get_profiling_info<sycl::info::event_profiling::command_submit>() ==
+         0);
+  assert(e.get_profiling_info<sycl::info::event_profiling::command_start>() ==
+         0);
+  assert(e.get_profiling_info<sycl::info::event_profiling::command_end>() == 0);
+}