profiling_info_submit was not property

This was gleaned by analyzing coverage (figuring out why that code was never called).

Added tests to improve coverage.

Author: oleksandr-pavlyk

dpctl/_sycl_event.pyx

@@ -323,6 +323,7 @@ cdef class SyclEvent(_SyclEvent):
         DPCTLEventVector_Delete(EVRef)
         return events
 
+    @property
     def profiling_info_submit(self):
         """
         Returns the 64-bit time value in nanoseconds

dpctl/tests/test_sycl_event.py

@@ -70,6 +70,11 @@ def test_create_event_from_capsule():
         pytest.fail("Failed to create an event from capsule")
 
 
+def test_invalid_constructor_arg():
+    with pytest.raises(TypeError):
+        dpctl.SyclEvent(list())
+
+
 def test_wait_with_event():
     event = dpctl.SyclEvent()
     try:
@@ -83,6 +88,11 @@ def test_wait_with_event():
         pytest.fail("Failed to wait for the event")
 
 
+def test_wait_for_invalid():
+    with pytest.raises(TypeError):
+        dpctl.SyclEvent.wait_for(77)
+
+
 def test_wait_with_list():
     event_1 = dpctl.SyclEvent()
     event_2 = dpctl.SyclEvent()
@@ -101,11 +111,27 @@ def test_execution_status():
     assert event_status == esty.complete
 
 
+def test_execution_status_nondefault_event():
+    event = produce_event()
+    try:
+        event_status = event.execution_status
+    except ValueError:
+        pytest.fail("Failed to get an event status")
+    assert type(event_status) is esty
+    wl = event.get_wait_list()
+    assert type(wl) is list
+
+
 def test_backend():
     try:
         dpctl.SyclEvent().backend
     except ValueError:
         pytest.fail("Failed to get backend from event")
+    event = produce_event()
+    try:
+        event.backend
+    except ValueError:
+        pytest.fail("Failed to get backend from event")
 
 
 @pytest.mark.skip(reason="event::get_wait_list() method returns wrong result")