def test_context_not_finished_by_end_of_diffs_list(self):
diffs = [
DiffItem(insert, 1),
DiffItem(unchanged, 0)]
diff_obj = Diff(list, diffs, context_limit=2)
self.assertEqual(
diff_obj._create_context_markers(), [(0, 1)])
def test_contexts_start_and_end_with_modified_items(self):
# this constraint could change; people may want more context...
diffs = [
DiffItem(unchanged, 1),
DiffItem(insert, 2),
DiffItem(insert, 2),
DiffItem(unchanged, 1)]
diff_obj = Diff(list, diffs)
self.assertEqual(
diff_obj._create_context_markers(), [(1, 3)])
def test_context_limit_is_adjustable(self):
'''The default context limit is 3, if we adjust it to 1 we expect a new
new context to be started if there is a gap of 2'''
diffs = [
DiffItem(insert, 1),
DiffItem(unchanged, 0),
DiffItem(unchanged, 0),
DiffItem(remove, 1)]
diff_obj = Diff(list, diffs, context_limit=1)
self.assertEqual(
diff_obj._create_context_markers(), [(0, 1), (3, 4)])
def test_context_limit_max(self):
'''Once a context is started,so long as the number of contiguous
unchanged items doesn't exceed the context limit, they remain part of
the context'''
diffs = [
DiffItem(insert, 1),
DiffItem(unchanged, 0),
DiffItem(unchanged, 0),
DiffItem(remove, 1)]
diff_obj = Diff(list, diffs, context_limit=2)
self.assertEqual(
diff_obj._create_context_markers(), [(0, 4)])
def test_context_limit_max_plus_one(self):
'''Once a context is started if the number of contiguous unchanged items
exceeds the context limit the context is cut off at the last modified
item and a new context is started'''
diffs = [
DiffItem(insert, 1),
DiffItem(unchanged, 0),
DiffItem(unchanged, 0),
DiffItem(unchanged, 0),
DiffItem(remove, 1)]
diff_obj = Diff(list, diffs, context_limit=2)
self.assertEqual(
diff_obj._create_context_markers(), [(0, 1), (4, 5)])
