debian-mirror-gitlab/spec/lib/gitlab/diff/position_tracer_spec.rb

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require 'spec_helper'
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describe Gitlab::Diff::PositionTracer do
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# Douwe's diary New York City, 2016-06-28
# --------------------------------------------------------------------------
#
# Dear diary,
#
# Ideally, we would have a test for every single diff scenario that can
# occur and that the PositionTracer should correctly trace a position
# through, across the following variables:
#
# - Old diff file type: created, changed, renamed, deleted, unchanged (5)
# - Old diff line type: added, removed, unchanged (3)
# - New diff file type: created, changed, renamed, deleted, unchanged (5)
# - New diff line type: added, removed, unchanged (3)
# - Old-to-new diff line change: kept, moved, undone (3)
#
# This adds up to 5 * 3 * 5 * 3 * 3 = 675 different potential scenarios,
# and 675 different tests to cover them all. In reality, it would be fewer,
# since one cannot have a removed line in a created file diff, for example,
# but for the sake of this diary entry, let's be pessimistic.
#
# Writing these tests is a manual and time consuming process, as every test
# requires the manual construction or finding of a combination of diffs that
# create the exact diff scenario we are looking for, and can take between
# 1 and 10 minutes, depending on the farfetchedness of the scenario and
# complexity of creating it.
#
# This means that writing tests to cover all of these scenarios would end up
# taking between 11 and 112 hours in total, which I do not believe is the
# best use of my time.
#
# A better course of action would be to think of scenarios that are likely
# to occur, but also potentially tricky to trace correctly, and only cover
# those, with a few more obvious scenarios thrown in to cover our bases.
#
# Unfortunately, I only came to the above realization once I was about
# 1/5th of the way through the process of writing ALL THE SPECS, having
# already wasted about 3 hours trying to be thorough.
#
# I did find 2 bugs while writing those though, so that's good.
#
# In any case, all of this means that the tests below will be extremely
# (excessively, unjustifiably) thorough for scenarios where "the file was
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# created in the old diff" and then drop off to comparatively lackluster
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# testing of other scenarios.
#
# I did still try to cover most of the obvious and potentially tricky
# scenarios, though.
include RepoHelpers
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let(:project) { create(:project, :repository) }
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let(:current_user) { project.owner }
let(:repository) { project.repository }
let(:file_name) { "test-file" }
let(:new_file_name) { "#{file_name}-new" }
let(:second_file_name) { "#{file_name}-2" }
let(:branch_name) { "position-tracer-test" }
let(:old_diff_refs) { raise NotImplementedError }
let(:new_diff_refs) { raise NotImplementedError }
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let(:change_diff_refs) { raise NotImplementedError }
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let(:old_position) { raise NotImplementedError }
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let(:position_tracer) { described_class.new(project: project, old_diff_refs: old_diff_refs, new_diff_refs: new_diff_refs) }
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subject { position_tracer.trace(old_position) }
def diff_refs(base_commit, head_commit)
Gitlab::Diff::DiffRefs.new(base_sha: base_commit.id, head_sha: head_commit.id)
end
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def text_position_attrs
[:old_line, :new_line]
end
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def position(attrs = {})
attrs.reverse_merge!(
diff_refs: old_diff_refs
)
Gitlab::Diff::Position.new(attrs)
end
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def expect_new_position(attrs, result = subject)
aggregate_failures("expect new position #{attrs.inspect}") do
if attrs.nil?
expect(result[:outdated]).to be_truthy
else
expect(result[:outdated]).to be_falsey
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new_position = result[:position]
expect(new_position).not_to be_nil
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expect(new_position.diff_refs).to eq(new_diff_refs)
attrs.each do |attr, value|
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if text_position_attrs.include?(attr)
expect(new_position.formatter.send(attr)).to eq(value)
else
expect(new_position.send(attr)).to eq(value)
end
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end
end
end
end
def expect_change_position(attrs, result = subject)
aggregate_failures("expect change position #{attrs.inspect}") do
expect(result[:outdated]).to be_truthy
change_position = result[:position]
if attrs.nil? || attrs.empty?
expect(change_position).to be_nil
else
expect(change_position).not_to be_nil
expect(change_position.diff_refs).to eq(change_diff_refs)
attrs.each do |attr, value|
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if text_position_attrs.include?(attr)
expect(change_position.formatter.send(attr)).to eq(value)
else
expect(change_position.send(attr)).to eq(value)
end
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end
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end
end
end
def create_branch(new_name, branch_name)
CreateBranchService.new(project, current_user).execute(new_name, branch_name)
end
def create_file(branch_name, file_name, content)
Files::CreateService.new(
project,
current_user,
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start_branch: branch_name,
branch_name: branch_name,
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commit_message: "Create file",
file_path: file_name,
file_content: content
).execute
project.commit(branch_name)
end
def update_file(branch_name, file_name, content)
Files::UpdateService.new(
project,
current_user,
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start_branch: branch_name,
branch_name: branch_name,
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commit_message: "Update file",
file_path: file_name,
file_content: content
).execute
project.commit(branch_name)
end
def delete_file(branch_name, file_name)
Files::DeleteService.new(
project,
current_user,
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start_branch: branch_name,
branch_name: branch_name,
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commit_message: "Delete file",
file_path: file_name
).execute
project.commit(branch_name)
end
let(:initial_commit) do
create_branch(branch_name, "master")[:branch].name
project.commit(branch_name)
end
describe "#trace" do
describe "diff scenarios" do
let(:create_file_commit) do
initial_commit
create_file(
branch_name,
file_name,
<<-CONTENT.strip_heredoc
A
B
C
CONTENT
)
end
let(:create_second_file_commit) do
create_file_commit
create_file(
branch_name,
second_file_name,
<<-CONTENT.strip_heredoc
D
E
CONTENT
)
end
let(:update_line_commit) do
create_second_file_commit
update_file(
branch_name,
file_name,
<<-CONTENT.strip_heredoc
A
BB
C
CONTENT
)
end
let(:update_second_file_line_commit) do
update_line_commit
update_file(
branch_name,
second_file_name,
<<-CONTENT.strip_heredoc
D
EE
CONTENT
)
end
let(:move_line_commit) do
update_second_file_line_commit
update_file(
branch_name,
file_name,
<<-CONTENT.strip_heredoc
BB
A
C
CONTENT
)
end
let(:add_second_file_line_commit) do
move_line_commit
update_file(
branch_name,
second_file_name,
<<-CONTENT.strip_heredoc
D
EE
F
CONTENT
)
end
let(:move_second_file_line_commit) do
add_second_file_line_commit
update_file(
branch_name,
second_file_name,
<<-CONTENT.strip_heredoc
D
F
EE
CONTENT
)
end
let(:delete_line_commit) do
move_second_file_line_commit
update_file(
branch_name,
file_name,
<<-CONTENT.strip_heredoc
BB
A
CONTENT
)
end
let(:delete_second_file_line_commit) do
delete_line_commit
update_file(
branch_name,
second_file_name,
<<-CONTENT.strip_heredoc
D
F
CONTENT
)
end
let(:delete_file_commit) do
delete_second_file_line_commit
delete_file(branch_name, file_name)
end
let(:rename_file_commit) do
delete_file_commit
create_file(
branch_name,
new_file_name,
<<-CONTENT.strip_heredoc
BB
A
CONTENT
)
end
let(:update_line_again_commit) do
rename_file_commit
update_file(
branch_name,
new_file_name,
<<-CONTENT.strip_heredoc
BB
AA
CONTENT
)
end
let(:move_line_again_commit) do
update_line_again_commit
update_file(
branch_name,
new_file_name,
<<-CONTENT.strip_heredoc
AA
BB
CONTENT
)
end
let(:delete_line_again_commit) do
move_line_again_commit
update_file(
branch_name,
new_file_name,
<<-CONTENT.strip_heredoc
AA
CONTENT
)
end
context "when the file was created in the old diff" do
context "when the file is created in the new diff" do
context "when the position pointed at an added line in the old diff" do
context "when the file's content was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
let(:new_diff_refs) { diff_refs(initial_commit, create_second_file_commit) }
let(:old_position) { position(new_path: file_name, new_line: 2) }
# old diff:
# 1 + A
# 2 + B
# 3 + C
#
# new diff:
# 1 + A
# 2 + B
# 3 + C
it "returns the new position" do
expect_new_position(
new_path: old_position.new_path,
new_line: old_position.new_line
)
end
end
context "when the file's content was changed between the old and the new diff" do
context "when that line was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
let(:old_position) { position(new_path: file_name, new_line: 1) }
# old diff:
# 1 + A
# 2 + B
# 3 + C
#
# new diff:
# 1 + A
# 2 + BB
# 3 + C
it "returns the new position" do
expect_new_position(
new_path: old_position.new_path,
new_line: old_position.new_line
)
end
end
context "when that line was moved between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
let(:new_diff_refs) { diff_refs(initial_commit, move_line_commit) }
let(:old_position) { position(new_path: file_name, new_line: 2) }
# old diff:
# 1 + A
# 2 + BB
# 3 + C
#
# new diff:
# 1 + BB
# 2 + A
# 3 + C
it "returns the new position" do
expect_new_position(
new_path: old_position.new_path,
new_line: 1
)
end
end
context "when that line was changed between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
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let(:change_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 2) }
# old diff:
# 1 + A
# 2 + B
# 3 + C
#
# new diff:
# 1 + A
# 2 + BB
# 3 + C
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 2,
new_line: nil
)
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end
end
context "when that line was deleted between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
let(:new_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
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let(:change_diff_refs) { diff_refs(update_line_commit, delete_line_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 3) }
# old diff:
# 1 + A
# 2 + BB
# 3 + C
#
# new diff:
# 1 + A
# 2 + BB
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 3,
new_line: nil
)
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end
end
end
end
end
context "when the file is changed in the new diff" do
context "when the position pointed at an added line in the old diff" do
context "when the file's content was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
let(:new_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
let(:old_position) { position(new_path: file_name, new_line: 1) }
# old diff:
# 1 + A
# 2 + BB
# 3 + C
#
# new diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
it "returns the new position" do
expect_new_position(
new_path: old_position.new_path,
new_line: old_position.new_line
)
end
end
context "when the file's content was changed between the old and the new diff" do
context "when that line was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
let(:new_diff_refs) { diff_refs(update_line_commit, move_line_commit) }
let(:old_position) { position(new_path: file_name, new_line: 3) }
# old diff:
# 1 + A
# 2 + BB
# 3 + C
#
# new diff:
# 1 - A
# 2 1 BB
# 2 + A
# 3 3 C
it "returns the new position" do
expect_new_position(
new_path: old_position.new_path,
new_line: old_position.new_line
)
end
end
context "when that line was moved between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
let(:new_diff_refs) { diff_refs(update_line_commit, move_line_commit) }
let(:old_position) { position(new_path: file_name, new_line: 2) }
# old diff:
# 1 + A
# 2 + BB
# 3 + C
#
# new diff:
# 1 - A
# 2 1 BB
# 2 + A
# 3 3 C
it "returns the new position" do
expect_new_position(
new_path: old_position.new_path,
new_line: 1
)
end
end
context "when that line was changed between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
let(:new_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
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let(:change_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 2) }
# old diff:
# 1 + A
# 2 + B
# 3 + C
#
# new diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 2,
new_line: nil
)
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end
end
context "when that line was deleted between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, move_line_commit) }
let(:new_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
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let(:change_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 3) }
# old diff:
# 1 + BB
# 2 + A
# 3 + C
#
# new diff:
# 1 1 BB
# 2 2 A
# 3 - C
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 3,
new_line: nil
)
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end
end
end
end
end
context "when the file is renamed in the new diff" do
context "when the position pointed at an added line in the old diff" do
context "when the file's content was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
let(:new_diff_refs) { diff_refs(delete_line_commit, rename_file_commit) }
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let(:change_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 2) }
# old diff:
# 1 + BB
# 2 + A
#
# new diff:
# file_name -> new_file_name
# 1 1 BB
# 2 2 A
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: nil,
new_line: 2
)
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end
end
context "when the file's content was changed between the old and the new diff" do
context "when that line was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
let(:new_diff_refs) { diff_refs(delete_line_commit, update_line_again_commit) }
let(:old_position) { position(new_path: file_name, new_line: 1) }
# old diff:
# 1 + BB
# 2 + A
#
# new diff:
# file_name -> new_file_name
# 1 1 BB
# 2 - A
# 2 + AA
it "returns the new position" do
expect_new_position(
old_path: file_name,
new_path: new_file_name,
old_line: old_position.new_line,
new_line: old_position.new_line
)
end
end
context "when that line was moved between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
let(:new_diff_refs) { diff_refs(delete_line_commit, move_line_again_commit) }
let(:old_position) { position(new_path: file_name, new_line: 1) }
# old diff:
# 1 + BB
# 2 + A
#
# new diff:
# file_name -> new_file_name
# 1 + AA
# 1 2 BB
# 2 - A
it "returns the new position" do
expect_new_position(
old_path: file_name,
new_path: new_file_name,
old_line: 1,
new_line: 2
)
end
end
context "when that line was changed between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
let(:new_diff_refs) { diff_refs(delete_line_commit, update_line_again_commit) }
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let(:change_diff_refs) { diff_refs(delete_line_commit, update_line_again_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 2) }
# old diff:
# 1 + BB
# 2 + A
#
# new diff:
# file_name -> new_file_name
# 1 1 BB
# 2 - A
# 2 + AA
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: new_file_name,
old_line: 2,
new_line: nil
)
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end
end
end
end
end
context "when the file is deleted in the new diff" do
context "when the position pointed at an added line in the old diff" do
context "when the file's content was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
let(:new_diff_refs) { diff_refs(delete_line_commit, delete_file_commit) }
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let(:change_diff_refs) { diff_refs(delete_line_commit, delete_file_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 2) }
# old diff:
# 1 + BB
# 2 + A
#
# new diff:
# 1 - BB
# 2 - A
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 2,
new_line: nil
)
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end
end
context "when the file's content was changed between the old and the new diff" do
context "when that line was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, move_line_commit) }
let(:new_diff_refs) { diff_refs(delete_line_commit, delete_file_commit) }
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let(:change_diff_refs) { diff_refs(move_line_commit, delete_file_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 2) }
# old diff:
# 1 + BB
# 2 + A
# 3 + C
#
# new diff:
# 1 - BB
# 2 - A
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 2,
new_line: nil
)
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end
end
context "when that line was moved between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
let(:new_diff_refs) { diff_refs(move_line_commit, delete_file_commit) }
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let(:change_diff_refs) { diff_refs(update_line_commit, delete_file_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 2) }
# old diff:
# 1 + A
# 2 + BB
# 3 + C
#
# new diff:
# 1 - BB
# 2 - A
# 3 - C
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 2,
new_line: nil
)
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end
end
context "when that line was changed between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
let(:new_diff_refs) { diff_refs(update_line_commit, delete_file_commit) }
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let(:change_diff_refs) { diff_refs(create_file_commit, delete_file_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 2) }
# old diff:
# 1 + A
# 2 + B
# 3 + C
#
# new diff:
# 1 - A
# 2 - BB
# 3 - C
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 2,
new_line: nil
)
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end
end
context "when that line was deleted between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, move_line_commit) }
let(:new_diff_refs) { diff_refs(delete_line_commit, delete_file_commit) }
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let(:change_diff_refs) { diff_refs(move_line_commit, delete_file_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 3) }
# old diff:
# 1 + BB
# 2 + A
# 3 + C
#
# new diff:
# 1 - BB
# 2 - A
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 3,
new_line: nil
)
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end
end
end
end
end
context "when the file is unchanged in the new diff" do
context "when the position pointed at an added line in the old diff" do
context "when the file's content was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
let(:new_diff_refs) { diff_refs(create_file_commit, create_second_file_commit) }
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let(:change_diff_refs) { diff_refs(initial_commit, create_file_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 2) }
# old diff:
# 1 + A
# 2 + B
# 3 + C
#
# new diff:
# 1 1 A
# 2 2 B
# 3 3 C
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: nil,
new_line: 2
)
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end
end
context "when the file's content was changed between the old and the new diff" do
context "when that line was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
let(:new_diff_refs) { diff_refs(update_line_commit, update_second_file_line_commit) }
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let(:change_diff_refs) { diff_refs(initial_commit, update_line_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 1) }
# old diff:
# 1 + A
# 2 + B
# 3 + C
#
# new diff:
# 1 1 A
# 2 2 BB
# 3 3 C
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: nil,
new_line: 1
)
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end
end
context "when that line was moved between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
let(:new_diff_refs) { diff_refs(move_line_commit, move_second_file_line_commit) }
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let(:change_diff_refs) { diff_refs(initial_commit, move_line_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 2) }
# old diff:
# 1 + A
# 2 + BB
# 3 + C
#
# new diff:
# 1 1 BB
# 2 2 A
# 3 3 C
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: nil,
new_line: 1
)
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end
end
context "when that line was changed between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
let(:new_diff_refs) { diff_refs(update_line_commit, update_second_file_line_commit) }
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let(:change_diff_refs) { diff_refs(create_file_commit, update_second_file_line_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 2) }
# old diff:
# 1 + A
# 2 + B
# 3 + C
#
# new diff:
# 1 1 A
# 2 2 BB
# 3 3 C
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 2,
new_line: nil
)
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end
end
context "when that line was deleted between the old and the new diff" do
let(:old_diff_refs) { diff_refs(initial_commit, move_line_commit) }
let(:new_diff_refs) { diff_refs(delete_line_commit, delete_second_file_line_commit) }
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let(:change_diff_refs) { diff_refs(move_line_commit, delete_second_file_line_commit) }
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let(:old_position) { position(new_path: file_name, new_line: 3) }
# old diff:
# 1 + BB
# 2 + A
# 3 + C
#
# new diff:
# 1 1 BB
# 2 2 A
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 3,
new_line: nil
)
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end
end
end
end
end
end
context "when the file was changed in the old diff" do
context "when the file is created in the new diff" do
context "when the position pointed at an added line in the old diff" do
context "when the file's content was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 2) }
# old diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
#
# new diff:
# 1 + A
# 2 + BB
# 3 + C
it "returns the new position" do
expect_new_position(
new_path: old_position.new_path,
old_line: nil,
new_line: old_position.new_line
)
end
end
context "when the file's content was changed between the old and the new diff" do
context "when that line was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
let(:new_diff_refs) { diff_refs(initial_commit, move_line_commit) }
let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 1) }
# old diff:
# 1 + BB
# 1 2 A
# 2 - B
# 3 3 C
#
# new diff:
# 1 + BB
# 2 + A
it "returns the new position" do
expect_new_position(
new_path: old_position.new_path,
old_line: nil,
new_line: old_position.new_line
)
end
end
context "when that line was moved between the old and the new diff" do
let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
let(:new_diff_refs) { diff_refs(initial_commit, move_line_commit) }
let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 2) }
# old diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
#
# new diff:
# 1 + BB
# 2 + A
# 3 + C
it "returns the new position" do
expect_new_position(
new_path: old_position.new_path,
old_line: nil,
new_line: 1
)
end
end
context "when that line was changed or deleted between the old and the new diff" do
let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
let(:new_diff_refs) { diff_refs(initial_commit, create_file_commit) }
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let(:change_diff_refs) { diff_refs(move_line_commit, create_file_commit) }
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let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 1) }
# old diff:
# 1 + BB
# 1 2 A
# 2 - B
# 3 3 C
#
# new diff:
# 1 + A
# 2 + B
# 3 + C
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 1,
new_line: nil
)
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end
end
end
end
context "when the position pointed at a deleted line in the old diff" do
let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
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let(:change_diff_refs) { diff_refs(create_file_commit, initial_commit) }
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let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 2) }
# old diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
#
# new diff:
# 1 + A
# 2 + BB
# 3 + C
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 2,
new_line: nil
)
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end
end
context "when the position pointed at an unchanged line in the old diff" do
context "when the file's content was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 1, new_line: 1) }
# old diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
#
# new diff:
# 1 + A
# 2 + BB
# 3 + C
it "returns the new position" do
expect_new_position(
new_path: old_position.new_path,
old_line: nil,
new_line: old_position.new_line
)
end
end
context "when the file's content was changed between the old and the new diff" do
context "when that line was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
let(:new_diff_refs) { diff_refs(initial_commit, move_line_commit) }
let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 1, new_line: 2) }
# old diff:
# 1 + BB
# 1 2 A
# 2 - B
# 3 3 C
#
# new diff:
# 1 + BB
# 2 + A
it "returns the new position" do
expect_new_position(
new_path: old_position.new_path,
old_line: nil,
new_line: old_position.new_line
)
end
end
context "when that line was moved between the old and the new diff" do
let(:old_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 2, new_line: 2) }
# old diff:
# 1 1 BB
# 2 2 A
# 3 - C
#
# new diff:
# 1 + A
# 2 + BB
# 3 + C
it "returns the new position" do
expect_new_position(
new_path: old_position.new_path,
old_line: nil,
new_line: 1
)
end
end
context "when that line was changed or deleted between the old and the new diff" do
let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
let(:new_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
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let(:change_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
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let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 3, new_line: 3) }
# old diff:
# 1 + BB
# 1 2 A
# 2 - B
# 3 3 C
#
# new diff:
# 1 + A
# 2 + B
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 3,
new_line: nil
)
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end
end
end
end
end
context "when the file is changed in the new diff" do
context "when the position pointed at an added line in the old diff" do
context "when the file's content was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
let(:new_diff_refs) { diff_refs(create_file_commit, update_second_file_line_commit) }
let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 2) }
# old diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
#
# new diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
it "returns the new position" do
expect_new_position(
old_path: old_position.old_path,
new_path: old_position.new_path,
old_line: nil,
new_line: old_position.new_line
)
end
end
context "when the file's content was changed between the old and the new diff" do
context "when that line was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
let(:new_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 1) }
# old diff:
# 1 + BB
# 1 2 A
# 2 - B
# 3 3 C
#
# new diff:
# 1 1 BB
# 2 2 A
# 3 - C
it "returns the new position" do
expect_new_position(
old_path: old_position.old_path,
new_path: old_position.new_path,
old_line: 1,
new_line: 1
)
end
end
context "when that line was moved between the old and the new diff" do
let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
let(:new_diff_refs) { diff_refs(update_line_commit, move_line_commit) }
let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 2) }
# old diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
#
# new diff:
# 1 - A
# 2 1 BB
# 2 + A
# 3 3 C
it "returns the new position" do
expect_new_position(
old_path: old_position.old_path,
new_path: old_position.new_path,
old_line: 2,
new_line: 1
)
end
end
context "when that line was changed or deleted between the old and the new diff" do
let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
let(:new_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
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let(:change_diff_refs) { diff_refs(move_line_commit, update_line_commit) }
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let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 1) }
# old diff:
# 1 + BB
# 1 2 A
# 2 - B
# 3 3 C
#
# new diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
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it "returns the position of the change" do
expect_change_position(
old_path: file_name,
new_path: file_name,
old_line: 1,
new_line: nil
)
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end
end
end
end
context "when the position pointed at a deleted line in the old diff" do
context "when the file's content was unchanged between the old and the new diff" do
let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
let(:new_diff_refs) { diff_refs(create_file_commit, update_second_file_line_commit) }
let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 2) }
# old diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
#
# new diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
it "returns the new position" do
expect_new_position(
old_path: old_position.old_path,
new_path: old_position.new_path,
old_line: old_position.old_line,
new_line: nil
)
end
end
end
end
end
end
end
describe "typical use scenarios" do
let(:second_branch_name) { "#{branch_name}-2" }
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def expect_new_positions(old_attrs, new_attrs)
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old_positions = old_attrs.map do |old_attrs|
position(old_attrs)
end
new_positions = old_positions.map do |old_position|
position_tracer.trace(old_position)
end
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aggregate_failures do
new_positions.zip(new_attrs).each do |new_position, new_attrs|
if new_attrs&.delete(:change)
expect_change_position(new_attrs, new_position)
else
expect_new_position(new_attrs, new_position)
end
end
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end
end
let(:create_file_commit) do
initial_commit
create_file(
branch_name,
file_name,
<<-CONTENT.strip_heredoc
A
B
C
D
E
F
CONTENT
)
end
let(:second_create_file_commit) do
create_file_commit
create_branch(second_branch_name, branch_name)
update_file(
second_branch_name,
file_name,
<<-CONTENT.strip_heredoc
Z
Z
Z
A
B
C
D
E
F
CONTENT
)
end
let(:update_file_commit) do
second_create_file_commit
update_file(
branch_name,
file_name,
<<-CONTENT.strip_heredoc
A
C
DD
E
F
G
CONTENT
)
end
let(:update_file_again_commit) do
update_file_commit
update_file(
branch_name,
file_name,
<<-CONTENT.strip_heredoc
A
BB
C
D
E
FF
G
CONTENT
)
end
describe "simple push of new commit" do
let(:old_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
let(:new_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
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let(:change_diff_refs) { diff_refs(update_file_commit, update_file_again_commit) }
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# old diff:
# 1 1 A
# 2 - B
# 3 2 C
# 4 - D
# 3 + DD
# 5 4 E
# 6 5 F
# 6 + G
#
# new diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
# 4 4 D
# 5 5 E
# 6 - F
# 6 + FF
# 7 + G
it "returns the new positions" do
old_position_attrs = [
{ old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, # A
{ old_path: file_name, old_line: 2 }, # - B
{ old_path: file_name, new_path: file_name, old_line: 3, new_line: 2 }, # C
{ old_path: file_name, old_line: 4 }, # - D
{ new_path: file_name, new_line: 3 }, # + DD
{ old_path: file_name, new_path: file_name, old_line: 5, new_line: 4 }, # E
{ old_path: file_name, new_path: file_name, old_line: 6, new_line: 5 }, # F
{ new_path: file_name, new_line: 6 }, # + G
]
new_position_attrs = [
{ old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 },
{ old_path: file_name, old_line: 2 },
{ old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 },
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{ new_path: file_name, new_line: 4, change: true },
{ new_path: file_name, old_line: 3, change: true },
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{ old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 },
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{ new_path: file_name, old_line: 5, change: true },
{ new_path: file_name, new_line: 7 }
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]
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expect_new_positions(old_position_attrs, new_position_attrs)
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end
end
describe "force push to overwrite last commit" do
let(:second_create_file_commit) do
create_file_commit
create_branch(second_branch_name, branch_name)
update_file(
second_branch_name,
file_name,
<<-CONTENT.strip_heredoc
A
BB
C
D
E
FF
G
CONTENT
)
end
let(:old_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
let(:new_diff_refs) { diff_refs(create_file_commit, second_create_file_commit) }
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let(:change_diff_refs) { diff_refs(update_file_commit, second_create_file_commit) }
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# old diff:
# 1 1 A
# 2 - B
# 3 2 C
# 4 - D
# 3 + DD
# 5 4 E
# 6 5 F
# 6 + G
#
# new diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
# 4 4 D
# 5 5 E
# 6 - F
# 6 + FF
# 7 + G
it "returns the new positions" do
old_position_attrs = [
{ old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, # A
{ old_path: file_name, old_line: 2 }, # - B
{ old_path: file_name, new_path: file_name, old_line: 3, new_line: 2 }, # C
{ old_path: file_name, old_line: 4 }, # - D
{ new_path: file_name, new_line: 3 }, # + DD
{ old_path: file_name, new_path: file_name, old_line: 5, new_line: 4 }, # E
{ old_path: file_name, new_path: file_name, old_line: 6, new_line: 5 }, # F
{ new_path: file_name, new_line: 6 }, # + G
]
new_position_attrs = [
{ old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 },
{ old_path: file_name, old_line: 2 },
{ old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 },
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{ new_path: file_name, new_line: 4, change: true },
{ old_path: file_name, old_line: 3, change: true },
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{ old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 },
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{ old_path: file_name, old_line: 5, change: true },
{ new_path: file_name, new_line: 7 }
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]
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expect_new_positions(old_position_attrs, new_position_attrs)
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end
end
describe "force push to delete last commit" do
let(:old_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
let(:new_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
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let(:change_diff_refs) { diff_refs(update_file_again_commit, update_file_commit) }
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# old diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
# 4 4 D
# 5 5 E
# 6 - F
# 6 + FF
# 7 + G
#
# new diff:
# 1 1 A
# 2 - B
# 3 2 C
# 4 - D
# 3 + DD
# 5 4 E
# 6 5 F
# 6 + G
it "returns the new positions" do
old_position_attrs = [
{ old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, # A
{ old_path: file_name, old_line: 2 }, # - B
{ new_path: file_name, new_line: 2 }, # + BB
{ old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 }, # C
{ old_path: file_name, new_path: file_name, old_line: 4, new_line: 4 }, # D
{ old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 }, # E
{ old_path: file_name, old_line: 6 }, # - F
{ new_path: file_name, new_line: 6 }, # + FF
{ new_path: file_name, new_line: 7 }, # + G
]
new_position_attrs = [
{ old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 },
{ old_path: file_name, old_line: 2 },
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{ old_path: file_name, old_line: 2, change: true },
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{ old_path: file_name, new_path: file_name, old_line: 3, new_line: 2 },
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{ old_path: file_name, old_line: 4, change: true },
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{ old_path: file_name, new_path: file_name, old_line: 5, new_line: 4 },
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{ new_path: file_name, new_line: 5, change: true },
{ old_path: file_name, old_line: 6, change: true },
{ new_path: file_name, new_line: 6 }
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]
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expect_new_positions(old_position_attrs, new_position_attrs)
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end
end
describe "rebase on top of target branch" do
let(:second_update_file_commit) do
update_file_commit
update_file(
second_branch_name,
file_name,
<<-CONTENT.strip_heredoc
Z
Z
Z
A
C
DD
E
F
G
CONTENT
)
end
let(:update_file_again_commit) do
second_update_file_commit
update_file(
branch_name,
file_name,
<<-CONTENT.strip_heredoc
A
BB
C
D
E
FF
G
CONTENT
)
end
let(:overwrite_update_file_again_commit) do
update_file_again_commit
update_file(
second_branch_name,
file_name,
<<-CONTENT.strip_heredoc
Z
Z
Z
A
BB
C
D
E
FF
G
CONTENT
)
end
let(:old_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
let(:new_diff_refs) { diff_refs(create_file_commit, overwrite_update_file_again_commit) }
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let(:change_diff_refs) { diff_refs(update_file_again_commit, overwrite_update_file_again_commit) }
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# old diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
# 4 4 D
# 5 5 E
# 6 - F
# 6 + FF
# 7 + G
#
# new diff:
# 1 + Z
# 2 + Z
# 3 + Z
# 1 4 A
# 2 - B
# 5 + BB
# 3 6 C
# 4 7 D
# 5 8 E
# 6 - F
# 9 + FF
# 0 + G
it "returns the new positions" do
old_position_attrs = [
{ old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, # A
{ old_path: file_name, old_line: 2 }, # - B
{ new_path: file_name, new_line: 2 }, # + BB
{ old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 }, # C
{ old_path: file_name, new_path: file_name, old_line: 4, new_line: 4 }, # D
{ old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 }, # E
{ old_path: file_name, old_line: 6 }, # - F
{ new_path: file_name, new_line: 6 }, # + FF
{ new_path: file_name, new_line: 7 }, # + G
]
new_position_attrs = [
{ old_path: file_name, new_path: file_name, old_line: 1, new_line: 4 }, # A
{ old_path: file_name, old_line: 2 }, # - B
{ new_path: file_name, new_line: 5 }, # + BB
{ old_path: file_name, new_path: file_name, old_line: 3, new_line: 6 }, # C
{ old_path: file_name, new_path: file_name, old_line: 4, new_line: 7 }, # D
{ old_path: file_name, new_path: file_name, old_line: 5, new_line: 8 }, # E
{ old_path: file_name, old_line: 6 }, # - F
{ new_path: file_name, new_line: 9 }, # + FF
{ new_path: file_name, new_line: 10 }, # + G
]
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expect_new_positions(old_position_attrs, new_position_attrs)
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end
end
describe "merge of target branch" do
let(:merge_commit) do
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second_create_file_commit
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merge_request = create(:merge_request, source_branch: second_branch_name, target_branch: branch_name, source_project: project)
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repository.merge(current_user, merge_request.diff_head_sha, merge_request, "Merge branches")
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project.commit(branch_name)
end
let(:old_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
let(:new_diff_refs) { diff_refs(create_file_commit, merge_commit) }
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let(:change_diff_refs) { diff_refs(update_file_again_commit, merge_commit) }
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# old diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
# 4 4 D
# 5 5 E
# 6 - F
# 6 + FF
# 7 + G
#
# new diff:
# 1 + Z
# 2 + Z
# 3 + Z
# 1 4 A
# 2 - B
# 5 + BB
# 3 6 C
# 4 7 D
# 5 8 E
# 6 - F
# 9 + FF
# 0 + G
it "returns the new positions" do
old_position_attrs = [
{ old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, # A
{ old_path: file_name, old_line: 2 }, # - B
{ new_path: file_name, new_line: 2 }, # + BB
{ old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 }, # C
{ old_path: file_name, new_path: file_name, old_line: 4, new_line: 4 }, # D
{ old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 }, # E
{ old_path: file_name, old_line: 6 }, # - F
{ new_path: file_name, new_line: 6 }, # + FF
{ new_path: file_name, new_line: 7 }, # + G
]
new_position_attrs = [
{ old_path: file_name, new_path: file_name, old_line: 1, new_line: 4 }, # A
{ old_path: file_name, old_line: 2 }, # - B
{ new_path: file_name, new_line: 5 }, # + BB
{ old_path: file_name, new_path: file_name, old_line: 3, new_line: 6 }, # C
{ old_path: file_name, new_path: file_name, old_line: 4, new_line: 7 }, # D
{ old_path: file_name, new_path: file_name, old_line: 5, new_line: 8 }, # E
{ old_path: file_name, old_line: 6 }, # - F
{ new_path: file_name, new_line: 9 }, # + FF
{ new_path: file_name, new_line: 10 }, # + G
]
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expect_new_positions(old_position_attrs, new_position_attrs)
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end
end
describe "changing target branch" do
let(:old_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
let(:new_diff_refs) { diff_refs(update_file_commit, update_file_again_commit) }
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let(:change_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
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# old diff:
# 1 1 A
# 2 - B
# 2 + BB
# 3 3 C
# 4 4 D
# 5 5 E
# 6 - F
# 6 + FF
# 7 + G
#
# new diff:
# 1 1 A
# 2 + BB
# 2 3 C
# 3 - DD
# 4 + D
# 4 5 E
# 5 - F
# 6 + FF
# 7 G
it "returns the new positions" do
old_position_attrs = [
{ old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, # A
{ old_path: file_name, old_line: 2 }, # - B
{ new_path: file_name, new_line: 2 }, # + BB
{ old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 }, # C
{ old_path: file_name, new_path: file_name, old_line: 4, new_line: 4 }, # D
{ old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 }, # E
{ old_path: file_name, old_line: 6 }, # - F
{ new_path: file_name, new_line: 6 }, # + FF
{ new_path: file_name, new_line: 7 }, # + G
]
new_position_attrs = [
{ old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 },
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{ old_path: file_name, old_line: 2, change: true },
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{ new_path: file_name, new_line: 2 },
{ old_path: file_name, new_path: file_name, old_line: 2, new_line: 3 },
{ new_path: file_name, new_line: 4 },
{ old_path: file_name, new_path: file_name, old_line: 4, new_line: 5 },
{ old_path: file_name, old_line: 5 },
{ new_path: file_name, new_line: 6 },
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{ new_path: file_name, new_line: 7 }
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]
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expect_new_positions(old_position_attrs, new_position_attrs)
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end
end
end
end