test: allow end times to be the same on nested context managers

performance-metrics/tests/performance_metrics/test_function_timer.py

@@ -117,7 +117,7 @@ async def test_nested_synchronous_functions() -> None:
     assert outer_time.start_time < outer_time.end_time
     assert inner_time.start_time < inner_time.end_time
     assert outer_time.start_time < inner_time.start_time
-    assert outer_time.end_time > inner_time.end_time
+    assert outer_time.end_time >= inner_time.end_time
 
 async def test_timing_sychronous_function_nested_inside_async_function() -> None:
     """Tests that the FunctionTimer correctly times a synchronous function inside an asynchronous context manager."""
@@ -132,7 +132,7 @@ async def test_timing_sychronous_function_nested_inside_async_function() -> None
     assert async_time.start_time < async_time.end_time
     assert sync_time.start_time < sync_time.end_time
     assert async_time.start_time < sync_time.start_time
-    assert async_time.end_time > sync_time.end_time
+    assert async_time.end_time >= sync_time.end_time
 
 
 def test_instantaneous_function() -> None:
@@ -204,7 +204,7 @@ async def test_function_timer_with_async_contexts() -> None:
     assert f1_time.start_time < f1_time.end_time
     assert f2_time.start_time < f2_time.end_time
     assert f1_time.start_time < f2_time.start_time
-    assert f1_time.end_time > f2_time.end_time
+    assert f1_time.end_time >= f2_time.end_time
 
 def test_direct_use_without_context_manager():
     timer = FunctionTimer()