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