gh-271: add tests for glass.observations

tests/test_observations.py

@@ -0,0 +1,22 @@
+def test_vmap_galactic_ecliptic() -> None:
+    """_summary_."""
+
+
+def test_gaussian_nz() -> None:
+    """_summary_."""
+
+
+def test_smail_nz() -> None:
+    """_summary_."""
+
+
+def test_fixed_zbins() -> None:
+    """_summary_."""
+
+
+def test_equal_dens_zbins() -> None:
+    """_summary_."""
+
+
+def test_tomo_nz_gausserr() -> None:
+    """_summary_."""