MAINT: Blacklist np.array_equal in tests (#18318)

Follow-up to gh-18087.

The remaining test that uses the function call uses
functionality that doesn't exist anymore in pandas.

Author: gfyoung

ci/lint.sh

@@ -72,7 +72,13 @@ if [ "$LINT" ]; then
     echo "Linting *.c and *.h DONE"
 
     echo "Check for invalid testing"
-    grep -r -E --include '*.py' --exclude testing.py '(numpy|np)\.testing' pandas
+
+    # Check for the following code in testing:
+    #
+    # np.testing
+    # np.array_equal
+    grep -r -E --include '*.py' --exclude testing.py '(numpy|np)(\.testing|\.array_equal)' pandas/tests/
+
     if [ $? = "0" ]; then
         RET=1
     fi

pandas/tests/internals/test_internals.py

@@ -286,29 +286,6 @@ def test_delete(self):
         with pytest.raises(Exception):
             newb.delete(3)
 
-    def test_split_block_at(self):
-
-        # with dup column support this method was taken out
-        # GH3679
-        pytest.skip("skipping for now")
-
-        bs = list(self.fblock.split_block_at('a'))
-        assert len(bs) == 1
-        assert np.array_equal(bs[0].items, ['c', 'e'])
-
-        bs = list(self.fblock.split_block_at('c'))
-        assert len(bs) == 2
-        assert np.array_equal(bs[0].items, ['a'])
-        assert np.array_equal(bs[1].items, ['e'])
-
-        bs = list(self.fblock.split_block_at('e'))
-        assert len(bs) == 1
-        assert np.array_equal(bs[0].items, ['a', 'c'])
-
-        # bblock = get_bool_ex(['f'])
-        # bs = list(bblock.split_block_at('f'))
-        # assert len(bs), 0)
-
 
 class TestDatetimeBlock(object):