pytester: Hookrecorder: improve assertoutcome

Before:

        def assertoutcome(self, passed: int = 0, skipped: int = 0, failed: int = 0) -> None:
            realpassed, realskipped, realfailed = self.listoutcomes()
            assert passed == len(realpassed)
    >       assert skipped == len(realskipped)
    E       assert 1 == 0
    E        +  where 0 = len([])

After:

    >       reprec = testdir.inline_run(testpath, "-s")
    E       AssertionError: ([], [], [<TestReport 'nodeid' when='call' outcome='failed'>])
    E       assert [0, 1, 0] == [0, 0, 1]

Author: blueyed

src/_pytest/pytester.py

@@ -332,10 +332,9 @@ def countoutcomes(self) -> List[int]:
         return [len(x) for x in self.listoutcomes()]
 
     def assertoutcome(self, passed: int = 0, skipped: int = 0, failed: int = 0) -> None:
-        realpassed, realskipped, realfailed = self.listoutcomes()
-        assert passed == len(realpassed)
-        assert skipped == len(realskipped)
-        assert failed == len(realfailed)
+        __tracebackhide__ = True
+        outcomes = self.listoutcomes()
+        assert [passed, skipped, failed] == [len(x) for x in outcomes], outcomes
 
     def clear(self) -> None:
         self.calls[:] = []