Do not report useless-suppression on duplicate-code

5 files changed, 31 insertions, 0 deletions

diff --git a/pylint/constants.py b/pylint/constants.py
index de98fbee0..90e2b734e 100644
--- a/pylint/constants.py
+++ b/pylint/constants.py
@@ -203,6 +203,7 @@ INCOMPATIBLE_WITH_USELESS_SUPPRESSION = frozenset(
         "W1511",  # deprecated-argument
         "W1512",  # deprecated-class
         "W1513",  # deprecated-decorator
+        "R0801",  # duplicate-code
     ]
 )
 
diff --git a/tests/regrtest_data/duplicate_code/useless_suppression/__init__.py b/tests/regrtest_data/duplicate_code/useless_suppression/__init__.py
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/tests/regrtest_data/duplicate_code/useless_suppression/__init__.py
diff --git a/tests/regrtest_data/duplicate_code/useless_suppression/file_one.py b/tests/regrtest_data/duplicate_code/useless_suppression/file_one.py
new file mode 100644
index 000000000..81c90e2e0
--- /dev/null
+++ b/tests/regrtest_data/duplicate_code/useless_suppression/file_one.py
@@ -0,0 +1,7 @@
+# pylint: disable=duplicate-code
+
+import argparse
+import math
+import os
+import random
+import sys
diff --git a/tests/regrtest_data/duplicate_code/useless_suppression/file_two.py b/tests/regrtest_data/duplicate_code/useless_suppression/file_two.py
new file mode 100644
index 000000000..d1849ed44
--- /dev/null
+++ b/tests/regrtest_data/duplicate_code/useless_suppression/file_two.py
@@ -0,0 +1,5 @@
+import argparse
+import math
+import os
+import random
+import sys
diff --git a/tests/test_similar.py b/tests/test_similar.py
index 02db89d41..cf9e8be5c 100644
--- a/tests/test_similar.py
+++ b/tests/test_similar.py
@@ -13,6 +13,7 @@ from typing import TextIO
 
 import pytest
 
+from pylint.reporters.text import TextReporter
 from pylint.testutils._run import _Run as Run
 from pylint.testutils.utils import _patch_streams
 
@@ -218,3 +219,20 @@ class TestSimilarCodeChecker:
             [path, "-e=duplicate-code", "-d=unused-import,C", "--ignore-imports=y"],
             code=0,
         )
+
+    @staticmethod
+    def test_useless_suppression() -> None:
+        """Tests that duplicate code and useless-suppression work well together."""
+        path = join(DATA, "useless_suppression")
+        pylint_output = StringIO()
+        reporter = TextReporter(pylint_output)
+        runner = Run(
+            [
+                path,
+                "-e=duplicate-code, useless-suppression",
+                "-d=missing-module-docstring, unused-import",
+            ],
+            reporter=reporter,
+            exit=False,
+        )
+        assert not runner.linter.stats.by_msg