    public function testEscapeField()
    {
        $field = '==HYPERLINK';
        $expected = "'==HYPERLINK";
        $this->assertEquals($expected, $this->cleanCSV->escapeField($field));
    }
The software saves user-provided information into a Comma-Separated Value (CSV) file, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as a command when the file is opened by spreadsheet software.