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

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require 'spec_helper'
describe MergeRequestDiff do
let(:diff_with_commits) { create(:merge_request).merge_request_diff }
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 '#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
describe '#diffs' do
context 'when the :ignore_whitespace_change option is set' do
it 'creates a new compare object instead of loading from the DB' 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.delete_all(merge_request_diff_id: diff_with_commits.id)
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 'uses the diffs from the DB' 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 '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
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
end