From ae5c370737bb99ed9344059622209c05aff575f2 Mon Sep 17 00:00:00 2001
From: "Ryan S. Brown" <sb@ryansb.com>
Date: Tue, 5 Dec 2017 16:36:24 -0500
Subject: [PATCH] Fail hard when tests pass that are expected to fail

`@pytest.mark.xfail()` can be used to decorate tests that don't yet
pass. By default, if I wrote a test like this:

```
@pytest.mark.xfail()
def test_naughty():
    assert 1 == 1
```

Then Pytest would allow this test to pass without notifying that an
expected-fail *didn't* fail. To make that happen, you have to set
xfail_strict=True so that the above test would cause the tests to fail.
---
 tox.ini | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tox.ini b/tox.ini
index 2e936c49659..d86c38965a8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,6 +20,8 @@ passenv =
     # variable error. See issue: #20424
     HOME
 
+[pytest]
+xfail_strict = true
 
 [flake8]
 # These are things that the devs don't agree make the code more readable