Time values must be increasing in check_values() + add test

pyproject.toml

@@ -91,6 +91,7 @@ dependencies = [
     "w3lib",
     "typing-extensions>=4.12.0",
     "StrEnum>=0.4.0",
+    "numpy",
 ]
 dynamic = ["version"]
 
@@ -103,7 +104,6 @@ dev = [
     "tox",
     "build",
     "ruff",
-    "numpy",
 ]
 
 [project.urls]

src/czml3/types.py

@@ -3,6 +3,7 @@
 import sys
 from typing import Any
 
+import numpy as np
 from dateutil.parser import isoparse as parse_iso_date
 from pydantic import (
     Field,
@@ -81,6 +82,8 @@ def check_values(num_points: int, values: list[Any]):
         raise TypeError(
             f"Input values must have either {num_points} or N * {num_points + 1} values, where N is the number of time-tagged samples."
         )
+    if len(values) % (num_points + 1) == 0 and np.any(np.diff(values[::4]) <= 0):
+        raise TypeError("Time values must be increasing.")
 
 
 def check_reference(r):

tests/test_properties.py

@@ -1648,3 +1648,8 @@ def test_position_list_of_lists_with_bad_references():
                 values=[["1#this"], ["1#this", "2#this"]]
             ),
         )
+
+
+def test_check_increasing_time():
+    with pytest.raises(TypeError):
+        Cartesian3Value(values=[0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0])