def test_delete_one(self):
ref = textwrap.dedent("""\
line1
deleteme
line2
""").splitlines()
new = textwrap.dedent("""\
line1
line2
""").splitlines()
syntax, = [
i.strip() for i in difflib.unified_diff(ref, new, n=0)
if i.startswith("@@")
]
assert syntax == "@@ -2 +1,0 @@"
expected = ("delete", 2, 1) # "d",start1,start2
actual = DiffList._translate_diff_syntax(syntax)
assert actual == expected
def test_change_one(self):
ref = textwrap.dedent("""\
line1
oldline
line2
""").splitlines()
new = textwrap.dedent("""\
line1
newline
line2
""").splitlines()
syntax, = [
i.strip() for i in difflib.unified_diff(ref, new, n=0)
if i.startswith("@@")
]
assert syntax == "@@ -2 +2 @@"
expected = ("change", 2, 2) # "c",start1,start2
actual = DiffList._translate_diff_syntax(syntax)
assert actual == expected
def test_insert_many(self):
ref = textwrap.dedent("""\
line1
line4
""").splitlines()
new = textwrap.dedent("""\
line1
line2
line3
line4
""").splitlines()
syntax, = [
i.strip() for i in difflib.unified_diff(ref, new, n=0)
if i.startswith("@@")
]
assert syntax == "@@ -1,0 +2,2 @@"
expected = ("insert", 1, 2)
actual = DiffList._translate_diff_syntax(syntax)
assert actual == expected
def test_malformed1(self):
expected_msg = "malformed unified diff hunk syntax"
syntax = "@@ 7 @@"
with pytest.raises(ValueError) as excinfo:
DiffList._translate_diff_syntax(syntax)
assert expected_msg in str(excinfo.value)
syntax = "@@ 7 10 0 @@"
with pytest.raises(ValueError) as excinfo:
DiffList._translate_diff_syntax(syntax)
assert expected_msg in str(excinfo.value)
syntax = "@@ 2,3 4,5"
with pytest.raises(ValueError) as excinfo:
DiffList._translate_diff_syntax(syntax)
assert expected_msg in str(excinfo.value)
def test_insert_one(self):
ref = textwrap.dedent("""\
line1
line2
""").splitlines()
new = textwrap.dedent("""\
line1
insert
line2
""").splitlines()
syntax, = [
i.strip() for i in difflib.unified_diff(ref, new, n=0)
if i.startswith("@@")
]
# unified diff hunk format:
# @@ -start,count +start,count @@
# -start and +start are starting line numbers in first and second file
# count is omitted if 1
# see https://www.gnu.org/software/diffutils/manual/html_node/Detailed-Unified.html#Detailed-Unified
assert syntax == "@@ -1,0 +2 @@"
expected = ("insert", 1, 2) # "i",start1,start2
actual = DiffList._translate_diff_syntax(syntax)
assert actual == expected