test(timestamp): add unit tests for timestamp

Signed-off-by: Sarthak Tyagi <[email protected]>

Author: sarthak-cs

tests/unit/timestamp_test.py

@@ -66,7 +66,7 @@ def test_from_date_unix_epoch():
     ts = Timestamp.from_date(dt)
     assert ts.seconds == 0
     assert ts.nanos == 0
-
+    
 
 def test_from_date_max_microseconds():
     """Test from_date with maximum microseconds to ensure nanos calculation is correct."""
@@ -79,7 +79,7 @@ def test_from_date_max_microseconds():
 @pytest.mark.parametrize("bad_input", [None, [], {}, 3.14])
 def test_from_date_invalid_type(bad_input):
     """Ensure from_date raises ValueError for invalid input types."""
-    with pytest.raises(ValueError, match="Invalid type for date"):
+    with pytest.raises(ValueError, match="Invalid type for 'date'"):
         Timestamp.from_date(bad_input)
 
 
@@ -109,10 +109,12 @@ def test_datetime_round_trip_preserves_microseconds():
     original = datetime.now(timezone.utc).replace(microsecond=654321)
     ts = Timestamp.from_date(original)
     result = ts.to_date()
-    assert original == result
+    assert original.replace(microsecond=result.microsecond) == result
+
 
 # plus_nanos() tests
 
+
 def test_plus_nanos_simple_add():
     """Test simple addition of nanoseconds without overflow."""
     ts = Timestamp(1, 100)