Set display.max_columns in num_regression to prevent truncated output

CHANGELOG.rst

@@ -1,3 +1,9 @@
+1.0.3 (2018-10-10)
+------------------
+
+* Set ``pandas`` ``display.max_columns`` option in ``num_regression`` to prevent
+  ``pandas`` from truncating the output (`#3 <https://github.com/ESSS/pytest-regressions/issues/3>`_).
+
 
 1.0.2 (2018-08-29)
 ------------------

src/pytest_regressions/num_regression.py

@@ -12,6 +12,7 @@ class NumericRegressionFixture(object):
 
     DISPLAY_PRECISION = 17  # Decimal places
     DISPLAY_WIDTH = 1000  # Max. Chars on outputs
+    DISPLAY_MAX_COLUMNS = 1000  # Max. Number of columns (see #3)
 
     def __init__(self, datadir, original_datadir, request):
         """
@@ -32,6 +33,8 @@ def __init__(self, datadir, original_datadir, request):
             NumericRegressionFixture.DISPLAY_PRECISION,
             "display.width",
             NumericRegressionFixture.DISPLAY_WIDTH,
+            "display.max_columns",
+            NumericRegressionFixture.DISPLAY_MAX_COLUMNS,
         )
 
     def _check_data_types(self, key, obtained_column, expected_column):

tests/test_num_regression.py

@@ -51,7 +51,6 @@ def compare_arrays(obtained, expected):
     )
 
 
-@pytest.mark.xfail(reason="#3 needs investigation", strict=True)
 def test_common_cases(num_regression, no_regen):
     # Most common case: Data is valid, is present and should pass
     data1 = 1.1 * np.ones(5000)