TestExpandIncludePatterns Class — langchain Architecture

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_file_search.py lines 300–327

class TestExpandIncludePatterns:
    """Tests for _expand_include_patterns helper function."""

    def test_expand_patterns_basic_brace_expansion(self) -> None:
        """Test basic brace expansion with multiple options."""
        result = _expand_include_patterns("*.{py,txt}")
        assert result == ["*.py", "*.txt"]

    def test_expand_patterns_nested_braces(self) -> None:
        """Test nested brace expansion."""
        result = _expand_include_patterns("test.{a,b}.{c,d}")
        assert result is not None
        assert len(result) == 4
        assert "test.a.c" in result
        assert "test.b.d" in result

    @pytest.mark.parametrize(
        "pattern",
        [
            "*.py}",  # closing brace without opening
            "*.{}",  # empty braces
            "*.{py",  # unclosed brace
        ],
    )
    def test_expand_patterns_invalid_braces(self, pattern: str) -> None:
        """Test patterns with invalid brace syntax return None."""
        result = _expand_include_patterns(pattern)
        assert result is None