Fix pytest-icdiff and ensure icdiff output _not_ used

Author: jamescooke

pytest_icdiff.py

@@ -23,6 +23,10 @@ def pytest_assertrepr_compare(config, op, left, right):
             return
     except TypeError:
         pass
+    except ValueError:
+        # ValueErrors are raised when numpy / pandas errors are checked
+        # Bail out of generating a diff and use pytest default output
+        return
 
     half_cols = COLS / 2 - MARGINS
 

tests/test_pytest_icdiff.py

@@ -310,3 +310,4 @@ def test():
     output = result.stdout.str()
     assert 'ValueError' not in output
     assert 'AssertionError' in output
+    assert 'where False = all(equals failed' not in output, 'pytest-icdiff not used'