Fix count of selected tests on terminal collection summary (#9628)

Author: schettino72

changelog/9626.bugfix.rst

@@ -0,0 +1,3 @@
+Fixed count of selected tests on terminal collection summary when there were errors or skipped modules.
+
+If there were errors or skipped modules on collection, pytest would mistakenly subtract those from the selected count.

src/_pytest/terminal.py

@@ -663,7 +663,7 @@ def report_collect(self, final: bool = False) -> None:
         errors = len(self.stats.get("error", []))
         skipped = len(self.stats.get("skipped", []))
         deselected = len(self.stats.get("deselected", []))
-        selected = self._numcollected - errors - skipped - deselected
+        selected = self._numcollected - deselected
         line = "collected " if final else "collecting "
         line += (
             str(self._numcollected) + " item" + ("" if self._numcollected == 1 else "s")
@@ -674,7 +674,7 @@ def report_collect(self, final: bool = False) -> None:
             line += " / %d deselected" % deselected
         if skipped:
             line += " / %d skipped" % skipped
-        if self._numcollected > selected > 0:
+        if self._numcollected > selected:
             line += " / %d selected" % selected
         if self.isatty:
             self.rewrite(line, bold=True, erase=True)

testing/test_cacheprovider.py

@@ -773,7 +773,7 @@ def pytest_sessionfinish():
         result = pytester.runpytest("--lf", "--lfnf", "none")
         result.stdout.fnmatch_lines(
             [
-                "collected 2 items / 2 deselected",
+                "collected 2 items / 2 deselected / 0 selected",
                 "run-last-failure: no previously failed tests, deselecting all items.",
                 "deselected=2",
                 "* 2 deselected in *",

testing/test_terminal.py

@@ -783,6 +783,33 @@ def test_pass():
         result.stdout.no_fnmatch_line("*= 1 deselected =*")
         assert result.ret == 0
 
+    def test_selected_count_with_error(self, pytester: Pytester) -> None:
+        pytester.makepyfile(
+            test_selected_count_3="""
+                def test_one():
+                    pass
+                def test_two():
+                    pass
+                def test_three():
+                    pass
+            """,
+            test_selected_count_error="""
+                5/0
+                def test_foo():
+                    pass
+                def test_bar():
+                    pass
+            """,
+        )
+        result = pytester.runpytest("-k", "test_t")
+        result.stdout.fnmatch_lines(
+            [
+                "collected 3 items / 1 error / 1 deselected / 2 selected",
+                "* ERROR collecting test_selected_count_error.py *",
+            ]
+        )
+        assert result.ret == ExitCode.INTERRUPTED
+
     def test_no_skip_summary_if_failure(self, pytester: Pytester) -> None:
         pytester.makepyfile(
             """