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public/py/vendor_linux/skyfield/tests/test_jpllib.py

@@ -0,0 +1,29 @@
+import os
+from skyfield.api import load, load_file
+
+def _data_path(filename):
+    return os.path.join(os.path.dirname(__file__), 'data', filename)
+
+# Test file generated with:
+# python -m jplephem excerpt 1969/07/29 1969/07/30 de441.bsp de441-1969.bsp
+
+def test_multiple_non_overlapping_segments_per_target():
+    ts = load.timescale()
+    t = ts.utc(1969, 7, [28, 29, 30, 31])
+    eph = load_file(_data_path('./de441-1969.bsp'))
+
+    pluto = eph['pluto barycenter']
+    assert type(pluto).__name__ == 'Stack'
+    assert len(pluto.segments) == 2
+
+    assert str(pluto.at(t).xyz) == (
+        '[[-30.47352052 -30.47318972 -30.47285863 -30.47252727]\n'
+        ' [ -0.96671442  -0.96985773  -0.97300104  -0.97614434]\n'
+        ' [  8.87919555   8.87811509   8.87703455   8.87595392]] au'
+    )
+
+    # Does the Stack correctly offer its .ephemeris to apparent()?
+
+    pluto.at(t).observe(pluto).apparent()
+
+    # TODO: SSB.at(t).observe() fails the above test.