From 1f10c59cd3a716bda3c7d4a91cdaa6fb9e910ef8 Mon Sep 17 00:00:00 2001
From: Tobias Diez <code@tobiasdiez.com>
Date: Sun, 27 Mar 2022 16:30:57 +0200
Subject: [PATCH 1/7] Clarify error message in case no collectors are found for
 a file

---
 src/_pytest/main.py | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/_pytest/main.py b/src/_pytest/main.py
index 8f590754ae0..fc42beb5ab4 100644
--- a/src/_pytest/main.py
+++ b/src/_pytest/main.py
@@ -645,9 +645,12 @@ def perform_collect(
             self.trace.root.indent -= 1
             if self._notfound:
                 errors = []
-                for arg, cols in self._notfound:
-                    line = f"(no name {arg!r} in any of {cols!r})"
-                    errors.append(f"not found: {arg}\n{line}")
+                for arg, collectors in self._notfound:
+                    if cols:
+                        errors.append(f"not found: {arg}\n(no name {arg!r} in any of {collectors!r})")
+                    else:
+                        errors.append(f"found no collectors for {arg}")
+                    
                 raise UsageError(*errors)
             if not genitems:
                 items = rep.result

From 0eae340e139058b1337908f6df86aaf71e7213ff Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Sun, 27 Mar 2022 14:41:11 +0000
Subject: [PATCH 2/7] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 src/_pytest/main.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/_pytest/main.py b/src/_pytest/main.py
index fc42beb5ab4..67bd0489804 100644
--- a/src/_pytest/main.py
+++ b/src/_pytest/main.py
@@ -647,10 +647,12 @@ def perform_collect(
                 errors = []
                 for arg, collectors in self._notfound:
                     if cols:
-                        errors.append(f"not found: {arg}\n(no name {arg!r} in any of {collectors!r})")
+                        errors.append(
+                            f"not found: {arg}\n(no name {arg!r} in any of {collectors!r})"
+                        )
                     else:
                         errors.append(f"found no collectors for {arg}")
-                    
+
                 raise UsageError(*errors)
             if not genitems:
                 items = rep.result

From 63c73380281e7201dde2be62dad6c6d58841c139 Mon Sep 17 00:00:00 2001
From: Tobias Diez <code@tobiasdiez.com>
Date: Sun, 27 Mar 2022 16:56:23 +0200
Subject: [PATCH 3/7] Fix rename issue

---
 src/_pytest/main.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/_pytest/main.py b/src/_pytest/main.py
index 67bd0489804..f2f0c667141 100644
--- a/src/_pytest/main.py
+++ b/src/_pytest/main.py
@@ -646,7 +646,7 @@ def perform_collect(
             if self._notfound:
                 errors = []
                 for arg, collectors in self._notfound:
-                    if cols:
+                    if collectors:
                         errors.append(
                             f"not found: {arg}\n(no name {arg!r} in any of {collectors!r})"
                         )

From 31595e8733bf28ae41f7a222fbf24596bf361338 Mon Sep 17 00:00:00 2001
From: Tobias Diez <code@tobiasdiez.com>
Date: Tue, 29 Mar 2022 12:33:13 +0200
Subject: [PATCH 4/7] Fix tests

---
 testing/acceptance_test.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/testing/acceptance_test.py b/testing/acceptance_test.py
index 71d3cc23a2e..92661b0f23a 100644
--- a/testing/acceptance_test.py
+++ b/testing/acceptance_test.py
@@ -186,8 +186,7 @@ def test_not_collectable_arguments(self, pytester: Pytester) -> None:
         assert result.ret == ExitCode.USAGE_ERROR
         result.stderr.fnmatch_lines(
             [
-                f"ERROR: not found: {p2}",
-                f"(no name {str(p2)!r} in any of [[][]])",
+                f"ERROR: found no collectors for {p2}",
                 "",
             ]
         )

From 141b301d3d085b8833827133cbe02f8dd13de36b Mon Sep 17 00:00:00 2001
From: Tobias Diez <code@tobiasdiez.com>
Date: Tue, 29 Mar 2022 12:34:15 +0200
Subject: [PATCH 5/7] Fix more tests

---
 testing/test_config.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/testing/test_config.py b/testing/test_config.py
index 6784809e097..b2c74085eae 100644
--- a/testing/test_config.py
+++ b/testing/test_config.py
@@ -1855,8 +1855,7 @@ def test_config_blocked_default_plugins(pytester: Pytester, plugin: str) -> None
         assert result.ret == ExitCode.USAGE_ERROR
         result.stderr.fnmatch_lines(
             [
-                "ERROR: not found: */test_config_blocked_default_plugins.py",
-                "(no name '*/test_config_blocked_default_plugins.py' in any of [])",
+                "ERROR: found no collectors for */test_config_blocked_default_plugins.py",
             ]
         )
         return

From 3fcdbaf0c5ece9a3f193de793c3f1abee6b57358 Mon Sep 17 00:00:00 2001
From: Tobias Diez <code@tobiasdiez.com>
Date: Tue, 29 Mar 2022 12:37:23 +0200
Subject: [PATCH 6/7] Add changelog

---
 changelog/9823.improvement.rst | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 changelog/9823.improvement.rst

diff --git a/changelog/9823.improvement.rst b/changelog/9823.improvement.rst
new file mode 100644
index 00000000000..0a14cab6743
--- /dev/null
+++ b/changelog/9823.improvement.rst
@@ -0,0 +1 @@
+Improved error message that is shown when no collector is found for a given file.

From 387ec02021e91ae11a89ec5fc578dc5251ea2468 Mon Sep 17 00:00:00 2001
From: Tobias Diez <code@tobiasdiez.com>
Date: Tue, 29 Mar 2022 12:38:34 +0200
Subject: [PATCH 7/7] Add to AUTHORS

---
 AUTHORS | 1 +
 1 file changed, 1 insertion(+)

diff --git a/AUTHORS b/AUTHORS
index 69e71fa10d4..0dbc728eba1 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -325,6 +325,7 @@ Thomas Grainger
 Thomas Hisch
 Tim Hoffmann
 Tim Strazny
+Tobias Diez
 Tom Dalton
 Tom Viner
 Tomáš Gavenčiak