'Verify that the first line starts with a string
:param lines: strings for each line of output
:type lines: list
:param beginning: verify this is at the beginning of the first line
:type beginning: string'

def assertFirstLineStartsWith(self, lines, beginning):

    self.assertTrue(lines[0].startswith(beginning), msg=('Beginning    of    first    line    has    invalid    content:    %s' % lines[:3]))
