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# frozen_string_literal: true
require 'fast_spec_helper'
require 'diff_match_patch'
RSpec.describe Gitlab::Diff::CharDiff do
let(:old_string) { "Helo \n Worlld" }
let(:new_string) { "Hello \n World" }
subject(:diff) { described_class.new(old_string, new_string) }
describe '#generate_diff' do
context 'when old string is nil' do
let(:old_string) { nil }
it 'does not raise an error' do
expect { subject.generate_diff }.not_to raise_error
end
it 'treats nil values as blank strings' do
changes = subject.generate_diff
expect(changes).to eq([
[:insert, "Hello \n World"]
])
end
end
it 'generates an array of changes' do
changes = subject.generate_diff
expect(changes).to eq([
[:equal, "Hel"],
[:insert, "l"],
[:equal, "o \n Worl"],
[:delete, "l"],
[:equal, "d"]
])
end
end
describe '#changed_ranges' do
subject { diff.changed_ranges }
context 'when old string is nil' do
let(:old_string) { nil }
it 'returns lists of changes' do
old_diffs, new_diffs = subject
expect(old_diffs).to eq([])
expect(new_diffs).to eq([Gitlab::MarkerRange.new(0, 12, mode: :addition)])
end
end
it 'returns ranges of changes' do
old_diffs, new_diffs = subject
expect(old_diffs).to eq([Gitlab::MarkerRange.new(11, 11, mode: :deletion)])
expect(new_diffs).to eq([Gitlab::MarkerRange.new(3, 3, mode: :addition)])
end
end
describe '#to_html' do
it 'returns an HTML representation of the diff' do
subject.generate_diff
expect(subject.to_html).to eq(
'<span class="idiff">Hel</span>' \
'<span class="idiff addition">l</span>' \
"<span class=\"idiff\">o \n Worl</span>" \
'<span class="idiff deletion">l</span>' \
'<span class="idiff">d</span>'
)
end
end
end
|
