"""Tests for DDEX utilities."""

from soundrecording_utils.ddex.utils.control_chars import remove_control_chars


class TestRemoveControlChars:
    """Tests for remove_control_chars function."""

    def test_removes_null_character(self) -> None:
        """Test that null characters are removed."""
        result = remove_control_chars('Hello\x00World')
        assert result == 'HelloWorld'

    def test_removes_bell_character(self) -> None:
        """Test that bell characters are removed."""
        result = remove_control_chars('Hello\x07World')
        assert result == 'HelloWorld'

    def test_removes_backspace(self) -> None:
        """Test that backspace characters are removed."""
        result = remove_control_chars('Hello\x08World')
        assert result == 'HelloWorld'

    def test_preserves_tab(self) -> None:
        """Test that tab characters are preserved."""
        result = remove_control_chars('Hello\tWorld')
        assert result == 'Hello\tWorld'

    def test_preserves_newline(self) -> None:
        """Test that newline characters are preserved."""
        result = remove_control_chars('Hello\nWorld')
        assert result == 'Hello\nWorld'

    def test_preserves_carriage_return(self) -> None:
        """Test that carriage return characters are preserved."""
        result = remove_control_chars('Hello\rWorld')
        assert result == 'Hello\rWorld'

    def test_strips_whitespace(self) -> None:
        """Test that leading/trailing whitespace is stripped."""
        result = remove_control_chars('  Hello World  ')
        assert result == 'Hello World'

    def test_handles_empty_string(self) -> None:
        """Test that empty strings are handled correctly."""
        result = remove_control_chars('')
        assert result == ''

    def test_removes_multiple_control_chars(self) -> None:
        """Test removal of multiple control characters."""
        result = remove_control_chars('\x00\x01\x02Hello\x03\x04\x05World\x06\x07')
        assert result == 'HelloWorld'