/brz/remove-bazaar

from bzrlib.selftest import TestCase

from bzrlib.diff import internal_diff

from cStringIO import StringIO

def udiff_lines(old, new):

    output = StringIO()

    internal_diff('old', old, 'new', new, output)

    output.seek(0, 0)

    return output.readlines()

def check_patch(lines):

    assert len(lines) > 1, \

        "Not enough lines for a file header for patch:\n%s" % "".join(lines)

    assert lines[0].startswith ('---'), \

        'No orig line for patch:\n%s' % "".join(lines)

    assert lines[1].startswith ('+++'), \

        'No mod line for patch:\n%s' % "".join(lines)

    assert len(lines) > 2, \

        "No hunks for patch:\n%s" % "".join(lines)

    assert lines[2].startswith('@@'),\

        "No hunk header for patch:\n%s" % "".join(lines)

    assert '@@' in lines[2][2:], \

        "Unterminated hunk header for patch:\n%s" % "".join(lines)

class TestDiff(TestCase):

    def test_add_nl(self):

        """diff generates a valid diff for patches that add a newline"""

        lines = udiff_lines(['boo'], ['boo\n'])

        check_patch(lines)

        assert lines[4] == '\\ No newline at end of file\n', \

            "expected no-nl, got %r" % lines[4]

    def test_add_nl_2(self):

        """diff generates a valid diff for patches that change last line and

        add a newline.

        """

        lines = udiff_lines(['boo'], ['goo\n'])

        check_patch(lines)

        assert lines[4] == '\\ No newline at end of file\n', \

            "expected no-nl, got %r" % lines[4]

    def test_remove_nl(self):

        """diff generates a valid diff for patches that change last line and

        add a newline.

        """

        lines = udiff_lines(['boo\n'], ['boo'])

        check_patch(lines)

        assert lines[5] == '\\ No newline at end of file\n', \

            "expected no-nl, got %r" % lines[5]