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# frozen_string_literal: true
require 'spec_helper'
describe Diff::LCS, '.diff' do
include Diff::LCS::SpecHelper::Matchers
it 'correctly diffs seq1 to seq2' do
diff_s1_s2 = Diff::LCS.diff(seq1, seq2)
expect(change_diff(correct_forward_diff)).to eq(diff_s1_s2)
end
it 'correctly diffs seq2 to seq1' do
diff_s2_s1 = Diff::LCS.diff(seq2, seq1)
expect(change_diff(correct_backward_diff)).to eq(diff_s2_s1)
end
it 'correctly diffs against an empty sequence' do
diff = Diff::LCS.diff(word_sequence, [])
correct_diff = [
[
['-', 0, 'abcd'],
['-', 1, 'efgh'],
['-', 2, 'ijkl'],
['-', 3, 'mnopqrstuvwxyz']
]
]
expect(change_diff(correct_diff)).to eq(diff)
diff = Diff::LCS.diff([], word_sequence)
correct_diff.each do |hunk|
hunk.each do |change| change[0] = '+' end
end
expect(change_diff(correct_diff)).to eq(diff)
end
it "correctly diffs 'xx' and 'xaxb'" do
left = 'xx'
right = 'xaxb'
expect(Diff::LCS.patch(left, Diff::LCS.diff(left, right))).to eq(right)
end
it 'returns an empty diff with (hello, hello)' do
expect(Diff::LCS.diff(hello, hello)).to be_empty
end
it 'returns an empty diff with (hello_ary, hello_ary)' do
expect(Diff::LCS.diff(hello_ary, hello_ary)).to be_empty
end
end
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