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#
# diffoscope: in-depth comparison of files, archives, and directories
#
# Copyright © 2015 Jérémy Bobbio <lunar@debian.org>
# Copyright © 2016-2020 Chris Lamb <lamby@debian.org>
#
# diffoscope is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# diffoscope is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with diffoscope. If not, see <https://www.gnu.org/licenses/>.
import io
import itertools
import pytest
from diffoscope.config import Config
from diffoscope.difference import Difference
def assert_size(diff, size):
assert size == diff.size()
assert size == sum(d.size_self() for d in diff.traverse_breadth())
g = itertools.count()
assert size == sum(
d.size_self() for d in diff.traverse_heapq(lambda x, _: next(g))
)
def assert_algebraic_properties(d, size):
assert d.equals(d.get_reverse().get_reverse())
assert d.get_reverse().size() == d.size() == size
def test_too_much_input_for_diff(monkeypatch):
monkeypatch.setattr(Config(), "max_diff_input_lines", 20)
too_long_text_a = io.StringIO("a\n" * 21)
too_long_text_b = io.StringIO("b\n" * 21)
difference = Difference.from_text_readers(
too_long_text_a, too_long_text_b, "a", "b"
)
assert "[ Too much input for diff " in difference.unified_diff
assert_algebraic_properties(difference, 342)
def test_too_long_diff_block_lines(monkeypatch):
monkeypatch.setattr(Config(), "enforce_constraints", False)
monkeypatch.setattr(Config(), "max_diff_block_lines_saved", 10)
too_long_text_a = io.StringIO("a\n" * 21)
too_long_text_b = io.StringIO("b\n" * 21)
difference = Difference.from_text_readers(
too_long_text_a, too_long_text_b, "a", "b"
)
assert "[ 11 lines removed ]" in difference.unified_diff
assert_algebraic_properties(difference, 124)
def test_size_updates():
d = Difference("path1", "path2", unified_diff="0123456789")
assert_size(d, 20)
d.add_details(
[Difference("path1/a", "path2/a", unified_diff="0123456789")]
)
assert_size(d, 44)
d.add_comment("lol1")
assert_size(d, 48)
def test_traverse_heapq():
d0 = Difference("path1/a", "path2/a", unified_diff="0")
d1 = Difference("path1/b", "path2/b", unified_diff="012")
d2 = Difference("path1/c", "path2/c", unified_diff="01")
d0.add_details(
[
Difference("path1/a/1", "path2/a/1", unified_diff="012345678"),
Difference("path1/a/2", "path2/a/2", unified_diff="0123"),
Difference("path1/a/3", "path2/a/3", unified_diff="012"),
]
)
d1.add_details(
[
Difference("path1/b/1", "path2/b/1", unified_diff="01234567"),
Difference("path1/b/2", "path2/b/2", unified_diff="01234"),
Difference("path1/b/3", "path2/b/3", unified_diff="012345"),
]
)
d2.add_details(
[
Difference("path1/c/1", "path2/c/1", unified_diff="01"),
Difference("path1/c/2", "path2/c/2", unified_diff="0123456789"),
Difference("path1/c/3", "path2/c/3", unified_diff="0123456"),
]
)
diff = Difference("path1", "path2", unified_diff="0123456789")
diff.add_details([d0, d1, d2])
# traverse nodes in depth order, but at a given depth traverse the nodes
# there from smallest diff (counted non-recursively) to largest
def f(node, parscore):
depth = parscore[0] + 1 if parscore else 0
return depth, node.size_self()
assert_size(diff, 284)
results = [d.source1[6:] for d in diff.traverse_heapq(f)]
assert results == [
"",
"a",
"c",
"b",
"c/1",
"a/3",
"a/2",
"b/2",
"b/3",
"c/3",
"b/1",
"a/1",
"c/2",
]
def test_non_str_arguments_to_source1_source2():
for x in ((None, "str"), ("str", None)):
a = io.StringIO("a")
b = io.StringIO("b")
with pytest.raises(TypeError):
Difference.from_text_readers(a, b, *x)
def test_adjust_diff_context(monkeypatch):
monkeypatch.setattr(Config(), "diff_context", 2)
a = io.StringIO("".join(str(i) + "\n" for i in range(20)))
b = io.StringIO(
"".join(str(i if i != 10 else "x") + "\n" for i in range(20))
)
difference = Difference.from_text_readers(a, b, "a", "b")
assert difference.unified_diff.count("\n") == 7
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