Fix --setup-only and --setup-show for custom pytest items

Fix pytest-dev#5884

changelog/5884.bugfix.rst

@@ -0,0 +1 @@
+Fix ``--setup-only`` and ``--setup-show`` for custom pytest items.

src/_pytest/runner.py

@@ -107,8 +107,8 @@ def show_test_item(item):
     tw = item.config.get_terminal_writer()
     tw.line()
     tw.write(" " * 8)
-    tw.write(item._nodeid)
-    used_fixtures = sorted(item._fixtureinfo.name2fixturedefs.keys())
+    tw.write(item.nodeid)
+    used_fixtures = sorted(getattr(item, "fixturenames", []))
     if used_fixtures:
         tw.write(" (fixtures used: {})".format(", ".join(used_fixtures)))
 

testing/conftest.py

@@ -88,3 +88,30 @@ def get_write_msg(self, idx):
         fullwidth = 80
 
     return TWMock()
+
+
+@pytest.fixture
+def dummy_yaml_custom_test(testdir):
+    """Writes a conftest file that collects and executes a dummy yaml test.
+
+    Taken from the docs, but stripped down to the bare minimum, useful for
+    tests which needs custom items collected.
+    """
+    testdir.makeconftest(
+        """
+        import pytest
+
+        def pytest_collect_file(parent, path):
+            if path.ext == ".yaml" and path.basename.startswith("test"):
+                return YamlFile(path, parent)
+
+        class YamlFile(pytest.File):
+            def collect(self):
+                yield YamlItem(self.fspath.basename, self)
+
+        class YamlItem(pytest.Item):
+            def runtest(self):
+                pass
+    """
+    )
+    testdir.makefile(".yaml", test1="")

testing/python/setup_only.py

@@ -6,8 +6,8 @@ def mode(request):
     return request.param
 
 
-def test_show_only_active_fixtures(testdir, mode):
-    p = testdir.makepyfile(
+def test_show_only_active_fixtures(testdir, mode, dummy_yaml_custom_test):
+    testdir.makepyfile(
         '''
         import pytest
         @pytest.fixture
@@ -21,7 +21,7 @@ def test_arg1(arg1):
     '''
     )
 
-    result = testdir.runpytest(mode, p)
+    result = testdir.runpytest(mode)
     assert result.ret == 0
 
     result.stdout.fnmatch_lines(

testing/python/setup_plan.py

@@ -1,6 +1,6 @@
-def test_show_fixtures_and_test(testdir):
+def test_show_fixtures_and_test(testdir, dummy_yaml_custom_test):
     """ Verifies that fixtures are not executed. """
-    p = testdir.makepyfile(
+    testdir.makepyfile(
         """
         import pytest
         @pytest.fixture
@@ -11,7 +11,7 @@ def test_arg(arg):
     """
     )
 
-    result = testdir.runpytest("--setup-plan", p)
+    result = testdir.runpytest("--setup-plan")
     assert result.ret == 0
 
     result.stdout.fnmatch_lines(