Bump pytest from 3.4.2 to 4.6.2 (#15)

* Bump pytest from 3.4.2 to 4.6.2

Bumps [pytest](https://github.com/pytest-dev/pytest) from 3.4.2 to 4.6.2.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@3.4.2...4.6.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* change error code to usage error code on tests
On version 3.8.0 of pytest a bug was fixed that an incorrect (or incomplete) flag returned EXIT_INTERRUPTED instead of EXIT_USAGEERROR.
This now checks for the correct error type

requirements.txt

@@ -7,7 +7,7 @@ funcsigs==1.0.2
 idna==2.8
 pluggy==0.12.0
 py==1.8.0
-pytest==3.4.2
+pytest==4.6.2
 PyYAML==5.1.1
 requests==2.22.0
 selenium==3.141.0

tests/unit/test_testobject.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 
 import pytest
-from _pytest.main import EXIT_INTERRUPTED
+from _pytest.main import EXIT_USAGEERROR
 
 
 @pytest.mark.smoke
@@ -16,7 +16,7 @@ def test_required_flag_output(testdir, flags):
 
     result = testdir.runpytest(flags)
 
-    assert result.ret == EXIT_INTERRUPTED
+    assert result.ret == EXIT_USAGEERROR
 
     result.stderr.fnmatch_lines([
         '*error: argument {}: expected one argument'.format(flags)