Fix linting

changelog/4093.trivial.rst

@@ -1 +1 @@
-The incorrect string literals are fixed.
+Fixed formatting of string literals in internal tests.

doc/en/example/assertion/failure_demo.py

@@ -245,9 +245,9 @@ class TestCustomAssertMsg(object):
             a = 1
 
         b = 2
-        assert A.a == b, (
-            "A.a appears not to be b\nor does not appear to be b\none of those"
-        )
+        assert (
+            A.a == b
+        ), "A.a appears not to be b\nor does not appear to be b\none of those"
 
     def test_custom_repr(self):
         class JSON(object):

src/_pytest/terminal.py

@@ -835,9 +835,7 @@ def repr_pythonversion(v=None):
 
 
 def build_summary_stats_line(stats):
-    keys = (
-        "failed passed skipped deselected xfailed xpassed warnings error"
-    ).split()
+    keys = ("failed passed skipped deselected xfailed xpassed warnings error").split()
     unknown_key_seen = False
     for key in stats.keys():
         if key not in keys:

testing/test_pdb.py

@@ -281,9 +281,7 @@ class TestPDB(object):
                 assert False
         """
         )
-        child = testdir.spawn_pytest(
-            "--show-capture=all --pdb -p no:logging %s" % p1
-        )
+        child = testdir.spawn_pytest("--show-capture=all --pdb -p no:logging %s" % p1)
         child.expect("get rekt")
         output = child.before.decode("utf8")
         assert "captured log" not in output