add test for photons

Author: bgmeulem

tests/test_photons.py

@@ -0,0 +1,10 @@
+from luminet.black_hole import BlackHole
+
+def test_photons(n=1000):
+    """
+    Test if black hole can sample individual photons
+    """
+
+    bh = BlackHole(incl=1.3)
+    photons, ghost_photons = bh.sample_photons(n)
+    return photons, ghost_photons