use assert ... in ... when using pytest earlier with 5.3.0

Author: utgwkk

.github/workflows/test.yml

@@ -32,6 +32,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
+        pip install -r requirements.txt
         pip install pytest==${{ matrix.pytest-version }}
 
     - name: Install itself

plugin_test.py

@@ -1,5 +1,6 @@
 pytest_plugins = 'pytester'
 import pytest
+from packaging import version
 
 def test_annotation_succeed_no_output(testdir):
     testdir.makepyfile(
@@ -13,9 +14,15 @@ def test_success():
     )
     testdir.monkeypatch.setenv('GITHUB_ACTIONS', 'true')
     result = testdir.runpytest_subprocess()
-    result.stdout.no_fnmatch_line(
-        '::error file=test_annotation_succeed_no_output.py*',
-    )
+
+    # no_fnmatch_line() is added to testdir on pytest 5.3.0
+    # https://docs.pytest.org/en/stable/changelog.html#pytest-5-3-0-2019-11-19
+    if version.parse(pytest.__version__) >= version.parse('5.3.0'):
+        result.stdout.no_fnmatch_line(
+            '::error file=test_annotation_succeed_no_output.py*',
+        )
+    else:
+        assert '::error file=test_annotation_succeed_no_output.py' not in result.stdout.str()
 
 def test_annotation_fail(testdir):
     testdir.makepyfile(