Merge pull request astropy#13074 from nstarman/cosmo-io-cosmology

Import cosmology io

Author: pllim

astropy/cosmology/io/__init__.py

@@ -6,4 +6,4 @@
 """
 
 # Import to register with the I/O machinery
-from . import ecsv, mapping, model, row, table, yaml  # noqa: F403
+from . import cosmology, ecsv, mapping, model, row, table, yaml  # noqa: F403

astropy/cosmology/io/tests/test_.py

@@ -0,0 +1,27 @@
+# Licensed under a 3-clause BSD style license - see LICENSE.rst
+
+"""Test that all expected methods are present, before I/O tests import.
+
+This file is weirdly named so that it's the first test of I/O.
+"""
+
+from astropy.cosmology.connect import convert_registry, readwrite_registry
+
+
+def test_expected_readwrite_io():
+    """Test that ONLY the expected I/O is registered."""
+
+    got = {k for k, _ in readwrite_registry._readers.keys()}
+    expected = {"ascii.ecsv"}
+
+    assert got == expected
+
+
+def test_expected_convert_io():
+    """Test that ONLY the expected I/O is registered."""
+
+    got = {k for k, _ in convert_registry._readers.keys()}
+    expected = {"astropy.cosmology", "mapping", "astropy.model", "astropy.row",
+                "astropy.table", "yaml"}
+
+    assert got == expected