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# frozen_string_literal: true
require 'spec_helper'
describe Gitlab::Diff::HighlightCache do
let(:merge_request) { create(:merge_request_with_diffs) }
subject(:cache) { described_class.new(merge_request.diffs, backend: backend) }
describe '#decorate' do
let(:backend) { double('backend').as_null_object }
# Manually creates a Diff::File object to avoid triggering the cache on
# the FileCollection::MergeRequestDiff
let(:diff_file) do
diffs = merge_request.diffs
raw_diff = diffs.diffable.raw_diffs(diffs.diff_options.merge(paths: ['CHANGELOG'])).first
Gitlab::Diff::File.new(raw_diff,
repository: diffs.project.repository,
diff_refs: diffs.diff_refs,
fallback_diff_refs: diffs.fallback_diff_refs)
end
it 'does not calculate highlighting when reading from cache' do
cache.write_if_empty
cache.decorate(diff_file)
expect_any_instance_of(Gitlab::Diff::Highlight).not_to receive(:highlight)
diff_file.highlighted_diff_lines
end
it 'assigns highlighted diff lines to the DiffFile' do
cache.write_if_empty
cache.decorate(diff_file)
expect(diff_file.highlighted_diff_lines.size).to be > 5
end
it 'submits a single reading from the cache' do
cache.decorate(diff_file)
cache.decorate(diff_file)
expect(backend).to have_received(:read).with(cache.key).once
end
end
describe '#write_if_empty' do
let(:backend) { double('backend', read: {}).as_null_object }
it 'submits a single writing to the cache' do
cache.write_if_empty
cache.write_if_empty
expect(backend).to have_received(:write).with(cache.key,
hash_including('CHANGELOG-false-false-false'),
expires_in: 1.week).once
end
end
describe '#clear' do
let(:backend) { double('backend').as_null_object }
it 'clears cache' do
cache.clear
expect(backend).to have_received(:delete).with(cache.key)
end
end
end
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