[Backport maintenance/2.17.x] [pyreverse] Bugfix: strip "/" at the end of the file

doc/whatsnew/fragments/8504.bugfix

@@ -0,0 +1,3 @@
+Fix a crash in pyreverse when "/" characters are used in the output filename e.g pyreverse -o png -p name/ path/to/project.
+
+Closes #8504

pylint/pyreverse/writer.py

@@ -41,7 +41,7 @@ def __init__(self, config: argparse.Namespace) -> None:
     def write(self, diadefs: Iterable[ClassDiagram | PackageDiagram]) -> None:
         """Write files for <project> according to <diadefs>."""
         for diagram in diadefs:
-            basename = diagram.title.strip().replace(" ", "_")
+            basename = diagram.title.strip().replace("/", "_").replace(" ", "_")
             file_name = f"{basename}.{self.config.output_format}"
             if os.path.exists(self.config.output_directory):
                 file_name = os.path.join(self.config.output_directory, file_name)

tests/pyreverse/test_writer.py

@@ -223,3 +223,20 @@ def test_color_for_stdlib_module(default_config: PyreverseConfig) -> None:
     obj.node = Mock()
     obj.node.qname.return_value = "collections"
     assert writer.get_shape_color(obj) == "grey"
+
+
+def test_package_name_with_slash(default_config: PyreverseConfig) -> None:
+    """Test to check the names of the generated files are corrected
+    when using an incorrect character like "/" in the package name.
+    """
+    writer = DiagramWriter(default_config)
+    obj = Mock()
+
+    obj.objects = []
+    obj.get_relationships.return_value = []
+    obj.title = "test/package/name/with/slash/"
+    writer.write([obj])
+
+    assert os.path.exists("test_package_name_with_slash_.dot")
+    # remove the generated file
+    os.remove("test_package_name_with_slash_.dot")