add test case fitsio/tests/test_empty_slice.py

fitsio/tests/test_empty_slice.py

@@ -0,0 +1,20 @@
+import tempfile
+import os
+import numpy as np
+from ..fitslib import write, FITS
+
+
+def test_empty_image_slice():
+    shape = (10, 10)
+    data = np.arange(shape[0] * shape[1]).reshape(shape)
+    outfile = 'test_image.fits'
+    with tempfile.TemporaryDirectory() as tmpdir:
+        fname = os.path.join(tmpdir, 'test.fits')
+        write(fname, data, clobber=True)
+
+        # third, test slices using fitsio
+        with FITS(outfile) as fits:
+            # first, passing the slices directly
+            # overlap = f[0][xslice, yslice]
+            overlap = fits[0][0:8, 0:0]
+            assert overlap.size == 0