few more tests on concat (though column logic could be masking things)

Author: JohnMount

tests/test_concat_rows.py

@@ -29,3 +29,44 @@ def test_concat_rows():
         ops=ops4,
         data={'d1': d1, 'd2': d2},
         expect=expect)
+
+
+def test_if_concat_is_stoopid_1():
+    # look if concat is concating by position intead of name
+    d1 = data_algebra.default_data_model.pd.DataFrame(
+        {"x": ['a'], "y": ['b']}
+    )
+
+    d2 = data_algebra.default_data_model.pd.DataFrame(
+        {"y": ['c'], "x": ['d']}
+    )
+
+    ops = describe_table(d1, "d1").concat_rows(b=describe_table(d2, "d2"), id_column=None)
+
+    expect = data_algebra.default_data_model.pd.DataFrame(
+        {"x": ['a', 'd'], "y": ['b', 'c']}
+    )
+
+    data_algebra.test_util.check_transform(
+        ops=ops,
+        data={'d1': d1, 'd2': d2},
+        expect=expect)
+
+
+def test_if_concat_is_stoopid_2():
+    # look if concat is concating by position intead of name
+    d1 = data_algebra.default_data_model.pd.DataFrame(
+        {"x": ['a'], "y": ['b']}
+    )
+
+    descr = describe_table(d1, "d1")
+    ops = descr.concat_rows(b=descr.select_columns(['y', 'x']), id_column=None)
+
+    expect = data_algebra.default_data_model.pd.DataFrame(
+        {"x": ['a', 'a'], "y": ['b', 'b']}
+    )
+
+    data_algebra.test_util.check_transform(
+        ops=ops,
+        data=d1,
+        expect=expect)