Add test for different timestep opts

Author: mkstratos

tests/test_numerics.py

@@ -179,6 +179,38 @@ def test_file_times():
     ]
     assert _times == step_times
 
+    _times = gen.get_file_times("0001-01-01", timestep="year")
+    assert _times == [
+        "0001",
+        "0002",
+        "0003",
+        "0004",
+        "0005",
+        "0006",
+        "0007",
+        "0008",
+        "0009",
+        "0010",
+        "0011",
+        "0012",
+    ]
+
+    _times = gen.get_file_times("0001-01-01", timestep="yearly-year-month-day")
+    assert _times == [
+        "0001-01-01",
+        "0002-01-01",
+        "0003-01-01",
+        "0004-01-01",
+        "0005-01-01",
+        "0006-01-01",
+        "0007-01-01",
+        "0008-01-01",
+        "0009-01-01",
+        "0010-01-01",
+        "0011-01-01",
+        "0012-01-01",
+    ]
+
 
 def test_to_netcdf():
     ntimes = 12