update unit tests

Author: SUTIENG Tam

skypy/halos/tests/test_colossus.py

@@ -120,7 +120,7 @@ def test_colossus_concentration():
     sigma8, ns = 0.82, 0.96
     c = concentration(mass, mdef, redshift, model, cosmo, sigma8, ns)
 
-    assert len(mass) == len(c)
+    assert len(c) == len(mass)
 
 @pytest.mark.skipif(not HAS_COLOSSUS, reason='test requires colossus')
 @pytest.mark.flaky
@@ -152,6 +152,6 @@ def test_colossus_Delta_Sigma():
     sigma8, ns = 0.82, 0.96
     radius = np.logspace(np.log10(300), np.log10(3000), 10)
 
-    DeltaSigma=delta_Sigma(mass, c, redshift, mdef, radius, cosmo, sigma8, ns)
+    DeltaSigma=Delta_Sigma(mass, c, redshift, mdef, radius, cosmo, sigma8, ns)
 
     assert len(DeltaSigma) == len(radius)