gitlab-org--gitlab-foss/spec/models/merge_request_diff_spec.rb

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# frozen_string_literal: true
require 'spec_helper'
describe MergeRequestDiff do
include RepoHelpers
let(:diff_with_commits) { create(:merge_request).merge_request_diff }
describe 'validations' do
subject { diff_with_commits }
it 'checks sha format of base_commit_sha, head_commit_sha and start_commit_sha' do
subject.base_commit_sha = subject.head_commit_sha = subject.start_commit_sha = 'foobar'
expect(subject.valid?).to be false
expect(subject.errors.count).to eq 3
expect(subject.errors).to all(include('is not a valid SHA'))
end
end
describe 'create new record' do
subject { diff_with_commits }
it { expect(subject).to be_valid }
it { expect(subject).to be_persisted }
it { expect(subject.commits.count).to eq(29) }
it { expect(subject.diffs.count).to eq(20) }
it { expect(subject.head_commit_sha).to eq('b83d6e391c22777fca1ed3012fce84f633d7fed0') }
it { expect(subject.base_commit_sha).to eq('ae73cb07c9eeaf35924a10f713b364d32b2dd34f') }
it { expect(subject.start_commit_sha).to eq('0b4bc9a49b562e85de7cc9e834518ea6828729b9') }
end
describe '.by_commit_sha' do
subject(:by_commit_sha) { described_class.by_commit_sha(sha) }
let!(:merge_request) { create(:merge_request, :with_diffs) }
context 'with sha contained in' do
let(:sha) { 'b83d6e391c22777fca1ed3012fce84f633d7fed0' }
it 'returns merge request diffs' do
expect(by_commit_sha).to eq([merge_request.merge_request_diff])
end
end
context 'with sha not contained in' do
let(:sha) { 'b83d6e3' }
it 'returns empty result' do
expect(by_commit_sha).to be_empty
end
end
end
describe '.ids_for_external_storage_migration' do
set(:merge_request) { create(:merge_request) }
set(:outdated) { merge_request.merge_request_diff }
set(:latest) { merge_request.create_merge_request_diff }
set(:closed_mr) { create(:merge_request, :closed_last_month) }
let(:closed) { closed_mr.merge_request_diff }
set(:merged_mr) { create(:merge_request, :merged_last_month) }
let(:merged) { merged_mr.merge_request_diff }
set(:recently_closed_mr) { create(:merge_request, :closed) }
let(:closed_recently) { recently_closed_mr.merge_request_diff }
set(:recently_merged_mr) { create(:merge_request, :merged) }
let(:merged_recently) { recently_merged_mr.merge_request_diff }
before do
merge_request.update!(latest_merge_request_diff: latest)
end
subject { described_class.ids_for_external_storage_migration(limit: 1000) }
context 'external diffs are disabled' do
before do
stub_external_diffs_setting(enabled: false)
end
it { is_expected.to be_empty }
end
context 'external diffs are misconfigured' do
before do
stub_external_diffs_setting(enabled: true, when: 'every second tuesday')
end
it { is_expected.to be_empty }
end
context 'external diffs are enabled unconditionally' do
before do
stub_external_diffs_setting(enabled: true)
end
it { is_expected.to contain_exactly(outdated.id, latest.id, closed.id, merged.id, closed_recently.id, merged_recently.id) }
end
context 'external diffs are enabled for outdated diffs' do
before do
stub_external_diffs_setting(enabled: true, when: 'outdated')
end
it 'returns records for outdated merge request versions' do
is_expected.to contain_exactly(outdated.id, closed.id, merged.id)
end
end
context 'with limit' do
it 'respects the limit' do
stub_external_diffs_setting(enabled: true)
expect(described_class.ids_for_external_storage_migration(limit: 3).count).to eq(3)
end
end
end
describe '#migrate_files_to_external_storage!' do
let(:diff) { create(:merge_request).merge_request_diff }
it 'converts from in-database to external storage' do
expect(diff).not_to be_stored_externally
stub_external_diffs_setting(enabled: true)
expect(diff).to receive(:save!)
diff.migrate_files_to_external_storage!
expect(diff).to be_stored_externally
end
it 'does nothing with an external diff' do
stub_external_diffs_setting(enabled: true)
expect(diff).to be_stored_externally
expect(diff).not_to receive(:save!)
diff.migrate_files_to_external_storage!
end
it 'does nothing if external diffs are disabled' do
expect(diff).not_to be_stored_externally
expect(diff).not_to receive(:save!)
diff.migrate_files_to_external_storage!
end
end
describe '#latest?' do
let!(:mr) { create(:merge_request, :with_diffs) }
let!(:first_diff) { mr.merge_request_diff }
let!(:last_diff) { mr.create_merge_request_diff }
Use latest_merge_request_diff association Compared to the merge_request_diff association: 1. It's simpler to query. The query uses a foreign key to the merge_request_diffs table, so no ordering is necessary. 2. It's faster for preloading. The merge_request_diff association has to load every diff for the MRs in the set, then discard all but the most recent for each. This association means that Rails can just query for N diffs from N MRs. 3. It's more complicated to update. This is a bidirectional foreign key, so we need to update two tables when adding a diff record. This also means we need to handle this as a special case when importing a GitLab project. There is some juggling with this association in the merge request model: * `MergeRequest#latest_merge_request_diff` is _always_ the latest diff. * `MergeRequest#merge_request_diff` reuses `MergeRequest#latest_merge_request_diff` unless: * Arguments are passed. These are typically to force-reload the association. * It doesn't exist. That means we might be trying to implicitly create a diff. This only seems to happen in specs. * The association is already loaded. This is important for the reasons explained in the comment, which I'll reiterate here: if we a) load a non-latest diff, then b) get its `merge_request`, then c) get that MR's `merge_request_diff`, we should get the diff we loaded in c), even though that's not the latest diff. Basically, `MergeRequest#merge_request_diff` is the latest diff in most cases, but not quite all.
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it { expect(last_diff.reload).to be_latest }
it { expect(first_diff.reload).not_to be_latest }
end
shared_examples_for 'merge request diffs' do
let(:merge_request) { create(:merge_request, :with_diffs) }
let!(:diff) { merge_request.merge_request_diff.reload }
context 'when it was not cleaned by the system' do
it 'returns persisted diffs' do
expect(diff).to receive(:load_diffs).and_call_original
diff.diffs.diff_files
end
end
context 'when diff was cleaned by the system' do
before do
diff.clean!
end
it 'returns diffs from repository if can compare with current diff refs' do
expect(diff).not_to receive(:load_diffs)
expect(Compare)
.to receive(:new)
.with(instance_of(Gitlab::Git::Compare), merge_request.target_project,
base_sha: diff.base_commit_sha, straight: false)
.and_call_original
diff.diffs
end
it 'returns persisted diffs if cannot compare with diff refs' do
expect(diff).to receive(:load_diffs).and_call_original
diff.update!(head_commit_sha: Digest::SHA1.hexdigest(SecureRandom.hex))
diff.diffs.diff_files
end
it 'returns persisted diffs if diff refs does not exist' do
expect(diff).to receive(:load_diffs).and_call_original
diff.update!(start_commit_sha: nil, base_commit_sha: nil)
diff.diffs.diff_files
end
end
describe '#raw_diffs' do
context 'when the :ignore_whitespace_change option is set' do
it 'creates a new compare object instead of using preprocessed data' do
expect(diff_with_commits).not_to receive(:load_diffs)
expect(diff_with_commits.compare).to receive(:diffs).and_call_original
diff_with_commits.raw_diffs(ignore_whitespace_change: true)
end
end
context 'when the raw diffs are empty' do
before do
MergeRequestDiffFile.where(merge_request_diff_id: diff_with_commits.id).delete_all
end
it 'returns an empty DiffCollection' do
expect(diff_with_commits.raw_diffs).to be_a(Gitlab::Git::DiffCollection)
expect(diff_with_commits.raw_diffs).to be_empty
end
end
context 'when the raw diffs exist' do
it 'returns the diffs' do
expect(diff_with_commits.raw_diffs).to be_a(Gitlab::Git::DiffCollection)
expect(diff_with_commits.raw_diffs).not_to be_empty
end
context 'when the :paths option is set' do
let(:diffs) { diff_with_commits.raw_diffs(paths: ['files/ruby/popen.rb', 'files/ruby/popen.rb']) }
it 'only returns diffs that match the (old path, new path) given' do
expect(diffs.map(&:new_path)).to contain_exactly('files/ruby/popen.rb')
end
it 'only serializes diff files found by query' do
expect(diff_with_commits.merge_request_diff_files.count).to be > 10
expect_any_instance_of(MergeRequestDiffFile).to receive(:to_hash).once
diffs
end
it 'uses the preprocessed diffs' do
expect(diff_with_commits).to receive(:load_diffs)
diffs
end
end
end
end
describe '#save_diffs' do
it 'saves collected state' do
mr_diff = create(:merge_request).merge_request_diff
expect(mr_diff.collected?).to be_truthy
end
it 'saves overflow state' do
allow(Commit).to receive(:max_diff_options)
.and_return(max_lines: 0, max_files: 0)
mr_diff = create(:merge_request).merge_request_diff
expect(mr_diff.overflow?).to be_truthy
end
it 'saves empty state' do
allow_any_instance_of(described_class).to receive_message_chain(:compare, :commits)
.and_return([])
mr_diff = create(:merge_request).merge_request_diff
expect(mr_diff.empty?).to be_truthy
end
it 'expands collapsed diffs before saving' do
mr_diff = create(:merge_request, source_branch: 'expand-collapse-lines', target_branch: 'master').merge_request_diff
diff_file = mr_diff.merge_request_diff_files.find_by(new_path: 'expand-collapse/file-5.txt')
expect(diff_file.diff).not_to be_empty
end
it 'saves binary diffs correctly' do
path = 'files/images/icn-time-tracking.pdf'
mr_diff = create(:merge_request, source_branch: 'add-pdf-text-binary', target_branch: 'master').merge_request_diff
diff_file = mr_diff.merge_request_diff_files.find_by(new_path: path)
expect(diff_file).to be_binary
expect(diff_file.diff).to eq(mr_diff.compare.diffs(paths: [path]).to_a.first.diff)
end
context 'with diffs that contain a null byte' do
let(:filename) { 'test-null.txt' }
let(:content) { "a" * 10000 + "\x00" }
let(:project) { create(:project, :repository) }
let(:branch) { 'null-data' }
let(:target_branch) { 'master' }
it 'saves diffs correctly' do
create_file_in_repo(project, target_branch, branch, filename, content)
mr_diff = create(:merge_request, target_project: project, source_project: project, source_branch: branch, target_branch: target_branch).merge_request_diff
diff_file = mr_diff.merge_request_diff_files.find_by(new_path: filename)
expect(diff_file).to be_binary
expect(diff_file.diff).to eq(mr_diff.compare.diffs(paths: [filename]).to_a.first.diff)
expect(diff_file.diff).to include(content)
end
end
end
end
describe 'internal diffs configured' do
include_examples 'merge request diffs'
end
describe 'external diffs always enabled' do
before do
stub_external_diffs_setting(enabled: true, when: 'always')
end
include_examples 'merge request diffs'
end
describe 'exernal diffs enabled for outdated diffs' do
before do
stub_external_diffs_setting(enabled: true, when: 'outdated')
end
include_examples 'merge request diffs'
it 'stores up-to-date diffs in the database' do
expect(diff).not_to be_stored_externally
end
it 'stores diffs for recently closed MRs in the database' do
mr = create(:merge_request, :closed)
expect(mr.merge_request_diff).not_to be_stored_externally
end
it 'stores diffs for recently merged MRs in the database' do
mr = create(:merge_request, :merged)
expect(mr.merge_request_diff).not_to be_stored_externally
end
it 'stores diffs for old MR versions in external storage' do
old_diff = diff
merge_request.create_merge_request_diff
old_diff.migrate_files_to_external_storage!
expect(old_diff).to be_stored_externally
end
it 'stores diffs for old closed MRs in external storage' do
mr = create(:merge_request, :closed_last_month)
expect(mr.merge_request_diff).to be_stored_externally
end
it 'stores diffs for old merged MRs in external storage' do
mr = create(:merge_request, :merged_last_month)
expect(mr.merge_request_diff).to be_stored_externally
end
end
describe '#commit_shas' do
it 'returns all commit SHAs using commits from the DB' do
expect(diff_with_commits.commit_shas).not_to be_empty
expect(diff_with_commits.commit_shas).to all(match(/\h{40}/))
end
end
describe '#compare_with' do
it 'delegates compare to the service' do
expect(CompareService).to receive(:new).and_call_original
diff_with_commits.compare_with(nil)
end
it 'uses git diff A..B approach by default' do
diffs = diff_with_commits.compare_with('0b4bc9a49b562e85de7cc9e834518ea6828729b9').diffs
expect(diffs.size).to eq(21)
end
end
describe '#commits_count' do
it 'returns number of commits using serialized commits' do
expect(diff_with_commits.commits_count).to eq(29)
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end
end
describe '#commits_by_shas' do
let(:commit_shas) { diff_with_commits.commit_shas }
it 'returns empty if no SHAs were provided' do
expect(diff_with_commits.commits_by_shas([])).to be_empty
end
it 'returns one SHA' do
commits = diff_with_commits.commits_by_shas([commit_shas.first, Gitlab::Git::BLANK_SHA])
expect(commits.count).to eq(1)
end
it 'returns all matching SHAs' do
commits = diff_with_commits.commits_by_shas(commit_shas)
expect(commits.count).to eq(commit_shas.count)
expect(commits.map(&:sha)).to match_array(commit_shas)
end
end
describe '#modified_paths' do
subject do
diff = create(:merge_request_diff)
create(:merge_request_diff_file, :new_file, merge_request_diff: diff)
create(:merge_request_diff_file, :renamed_file, merge_request_diff: diff)
diff
end
it 'returns affected file paths' do
expect(subject.modified_paths).to eq(%w{foo bar baz})
end
end
describe '#opening_external_diff' do
subject(:diff) { diff_with_commits }
context 'external diffs disabled' do
it { expect(diff.external_diff).not_to be_exists }
it 'yields nil' do
expect { |b| diff.opening_external_diff(&b) }.to yield_with_args(nil)
end
end
context 'external diffs enabled' do
let(:test_dir) { 'tmp/tests/external-diffs' }
around do |example|
FileUtils.mkdir_p(test_dir)
begin
example.run
ensure
FileUtils.rm_rf(test_dir)
end
end
before do
stub_external_diffs_setting(enabled: true, storage_path: test_dir)
end
it { expect(diff.external_diff).to be_exists }
it 'yields an open file' do
expect { |b| diff.opening_external_diff(&b) }.to yield_with_args(File)
end
it 'is re-entrant' do
outer_file_a =
diff.opening_external_diff do |outer_file|
diff.opening_external_diff do |inner_file|
expect(outer_file).to eq(inner_file)
end
outer_file
end
diff.opening_external_diff do |outer_file_b|
expect(outer_file_a).not_to eq(outer_file_b)
end
end
end
end
end