Avoid traceback formatting for xfail(run=False)

AUTHORS

@@ -7,6 +7,7 @@ Aaron Coleman
 Abdeali JK
 Abdelrahman Elbehery
 Abhijeet Kasurde
+ace2016
 Adam Johnson
 Adam Stewart
 Adam Uhlir

changelog/9436.improvement.rst

@@ -0,0 +1 @@
+Avoided formatting tracebacks for tests marked with ``xfail(run=False)``.

src/_pytest/skipping.py

@@ -252,7 +252,7 @@ def pytest_runtest_setup(item: Item) -> None:
 
     item.stash[xfailed_key] = xfailed = evaluate_xfail_marks(item)
     if xfailed and not item.config.option.runxfail and not xfailed.run:
-        xfail("[NOTRUN] " + xfailed.reason)
+        raise xfail.Exception("[NOTRUN] " + xfailed.reason, pytrace=False)
 
 
 @hookimpl(wrapper=True)
@@ -262,7 +262,7 @@ def pytest_runtest_call(item: Item) -> Generator[None]:
         item.stash[xfailed_key] = xfailed = evaluate_xfail_marks(item)
 
     if xfailed and not item.config.option.runxfail and not xfailed.run:
-        xfail("[NOTRUN] " + xfailed.reason)
+        raise xfail.Exception("[NOTRUN] " + xfailed.reason, pytrace=False)
 
     try:
         return (yield)

testing/test_skipping.py

@@ -3,6 +3,7 @@
 
 import textwrap
 
+from _pytest._code import ExceptionInfo
 from _pytest.pytester import Pytester
 from _pytest.runner import runtestprotocol
 from _pytest.skipping import evaluate_skip_marks
@@ -453,6 +454,32 @@ def test_this_false():
             ]
         )
 
+    def test_xfail_not_run_does_not_format_traceback(
+        self, pytester: Pytester, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
+        item = pytester.getitem(
+            """
+            import pytest
+
+            @pytest.mark.xfail(run=False, reason="noway")
+            def test_func():
+                assert 0
+            """
+        )
+        getrepr = ExceptionInfo.getrepr
+        styles = []
+
+        def spy_getrepr(self, *args, **kwargs):
+            styles.append(kwargs["style"])
+            return getrepr(self, *args, **kwargs)
+
+        monkeypatch.setattr(ExceptionInfo, "getrepr", spy_getrepr)
+
+        reports = runtestprotocol(item, log=False)
+
+        assert reports[0].skipped
+        assert styles == ["value"]
+
     def test_xfail_not_run_no_setup_run(self, pytester: Pytester) -> None:
         p = pytester.makepyfile(
             test_one="""