Work around pandas.Index.equals change in 0.19.0

Traditionally, `pandas.Index([1, 2]).equals([1, 2])` returned True. In
0.19.0, it returns False, and we have to explicitly upcast the argument
to an Index to get the test we want.

pandas-dev/pandas#14411

Author: njsmith

patsy/test_build.py

@@ -429,7 +429,7 @@ def __getitem__(self, key):
                                       return_type="dataframe")
     assert isinstance(int_df, pandas.DataFrame)
     assert np.array_equal(int_df, [[1], [1], [1]])
-    assert int_df.index.equals([10, 20, 30])
+    assert int_df.index.equals(pandas.Index([10, 20, 30]))
 
     import patsy.build
     had_pandas = patsy.build.have_pandas
@@ -448,7 +448,7 @@ def __getitem__(self, key):
                                                    dtype=object)},
                                   NA_action="drop",
                                   return_type="dataframe")
-    assert x_df.index.equals([2])
+    assert x_df.index.equals(pandas.Index([2]))
 
 def test_data_mismatch():
     test_cases_twoway = [

patsy/test_highlevel.py

@@ -672,7 +672,7 @@ def test_dmatrix_NA_action():
         assert np.array_equal(mat, [[1, 2, 20],
                                     [1, 3, 30]])
         if return_type == "dataframe":
-            assert mat.index.equals([1, 2])
+            assert mat.index.equals(pandas.Index([1, 2]))
         assert_raises(PatsyError, dmatrix, "x + y", data=data,
                       return_type=return_type,
                       NA_action="raise")
@@ -681,8 +681,8 @@ def test_dmatrix_NA_action():
         assert np.array_equal(lmat, [[20], [30]])
         assert np.array_equal(rmat, [[1, 2], [1, 3]])
         if return_type == "dataframe":
-            assert lmat.index.equals([1, 2])
-            assert rmat.index.equals([1, 2])
+            assert lmat.index.equals(pandas.Index([1, 2]))
+            assert rmat.index.equals(pandas.Index([1, 2]))
         assert_raises(PatsyError,
                       dmatrices, "y ~ x", data=data, return_type=return_type,
                       NA_action="raise")
@@ -693,8 +693,8 @@ def test_dmatrix_NA_action():
         assert np.array_equal(lmat, [[20], [30], [40]])
         assert np.array_equal(rmat, [[1], [1], [1]])
         if return_type == "dataframe":
-            assert lmat.index.equals([1, 2, 3])
-            assert rmat.index.equals([1, 2, 3])
+            assert lmat.index.equals(pandas.Index([1, 2, 3]))
+            assert rmat.index.equals(pandas.Index([1, 2, 3]))
         assert_raises(PatsyError,
                       dmatrices, "y ~ 1", data=data, return_type=return_type,
                       NA_action="raise")