make timeseries with < 3 timestamps exempt from regular_timestamps check

Author: bendichter

nwbinspector/checks/time_series.py

@@ -13,7 +13,7 @@ def check_regular_timestamps(
     time_series: TimeSeries, time_tolerance_decimals: int = 9, gb_severity_threshold: float = 1.0
 ):
     """If the TimeSeries uses timestamps, check if they are regular (i.e., they have a constant rate)."""
-    if time_series.timestamps is not None and check_regular_series(
+    if time_series.timestamps is not None and len(time_series.timestamps) > 2 and check_regular_series(
         series=time_series.timestamps, tolerance_decimals=time_tolerance_decimals
     ):
         timestamps = np.array(time_series.timestamps)

tests/unit_tests/test_time_series.py

@@ -35,6 +35,18 @@ def test_check_regular_timestamps():
     )
 
 
+def test_pass_check_regular_timestamps():
+    """Should pass because there are only two timestamps"""
+    assert check_regular_timestamps(
+        time_series=pynwb.TimeSeries(
+            name="test_time_series",
+            unit="test_units",
+            data=[0, 0],
+            timestamps=[1.2, 3.2],
+        )
+    ) is None
+
+
 def test_check_data_orientation():
     assert check_data_orientation(
         time_series=pynwb.TimeSeries(