chore: import upstream snapshot with attribution

dev/clint/tests/rules/test_implicit_optional.py

@@ -0,0 +1,60 @@
+from pathlib import Path
+
+from clint.config import Config
+from clint.index import SymbolIndex
+from clint.linter import Position, Range, lint_file
+from clint.rules import ImplicitOptional
+
+
+def test_implicit_optional(index: SymbolIndex) -> None:
+    code = """
+from typing import Optional
+
+# Bad
+bad: int = None
+class Bad:
+    x: str = None
+
+# Good
+good: Optional[int] = None
+class Good:
+    x: Optional[str] = None
+"""
+    config = Config(select={ImplicitOptional.name})
+    results = lint_file(Path("test.py"), code, config, index)
+    assert len(results) == 2
+    assert all(isinstance(r.rule, ImplicitOptional) for r in results)
+    assert results[0].range == Range(Position(4, 5))
+    assert results[1].range == Range(Position(6, 7))
+
+
+def test_implicit_optional_stringified(index: SymbolIndex) -> None:
+    code = """
+from typing import Optional
+
+# Bad - stringified without Optional or None union
+bad1: "int" = None
+bad2: "str" = None
+class Bad:
+    x: "int" = None
+
+# Good - stringified with Optional
+good1: "Optional[int]" = None
+good2: "Optional[str]" = None
+class Good1:
+    x: "Optional[str]" = None
+
+# Good - stringified with | None
+good3: "int | None" = None
+good4: "str | None" = None
+good5: "int|None" = None
+class Good2:
+    x: "SomeClass | None" = None
+"""
+    config = Config(select={ImplicitOptional.name})
+    results = lint_file(Path("test.py"), code, config, index)
+    assert len(results) == 3
+    assert all(isinstance(r.rule, ImplicitOptional) for r in results)
+    assert results[0].range == Range(Position(4, 6))  # bad1
+    assert results[1].range == Range(Position(5, 6))  # bad2
+    assert results[2].range == Range(Position(7, 7))  # Bad.x