fix tests for __str__ methods

madarrays/tests/test_madarray.py

@@ -664,6 +664,7 @@ class TestMadArray:
 
     def test_str_repr(self):
 
+        # test when no data is missing
         x = np.copy(self.x_float)
         arr_str = np.ndarray.__str__(x)
 
@@ -671,6 +672,7 @@ class TestMadArray:
         string = 'MadArray, dtype=float64, 0 missing entries (0.0%)\n{}'
         assert str(ma) == string.format(arr_str)
 
+        # test with missing data, float values
         x[self.m] = np.nan
         arr_str = np.ndarray.__str__(x)
         arr_str = arr_str.replace('nan', '  x')
@@ -683,6 +685,7 @@ class TestMadArray:
         string = '<MadArray at {}>'
         assert repr(ma) == string.format(hex(id(ma)))
 
+        # test with missing data, float values from int
         x = np.copy(self.x_int).astype(np.float64)
         x[self.m] = np.nan
         arr_str = np.ndarray.__str__(x)