discourse/spec/lib/onpdiff_spec.rb

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# frozen_string_literal: true
RSpec.describe ONPDiff do
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describe "diff" do
it "returns an empty array when there is no content to diff" do
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expect(ONPDiff.new("", "").diff).to eq([])
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end
it "returns an array with the operation code for each element" do
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expect(ONPDiff.new("abcd", "abef").diff).to eq(
[["a", :common], ["b", :common], ["e", :add], ["f", :add], ["c", :delete], ["d", :delete]],
)
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end
it "bails out on large diffs" do
a = SecureRandom.alphanumeric(5_000)
b = SecureRandom.alphanumeric(5_000)
expect(ONPDiff.new(a, b).diff).to eq([])
end
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end
describe "short_diff" do
it "returns an empty array when there is no content to diff" do
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expect(ONPDiff.new("", "").short_diff).to eq([])
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end
it "returns an array with the operation code for each element" do
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expect(ONPDiff.new("abc", "acd").short_diff).to eq(
[["a", :common], ["b", :delete], ["c", :common], ["d", :add]],
)
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end
it "returns an array with sequentially similar operations merged" do
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expect(ONPDiff.new("abcd", "abef").short_diff).to eq(
[["ab", :common], ["ef", :add], ["cd", :delete]],
)
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end
end
describe "paragraph_diff" do
it "returns an empty array when there is no content to diff" do
expect(ONPDiff.new("", "").paragraph_diff).to eq([])
end
it "returns an array with the operation code for each element" do
expect(ONPDiff.new("abc", "acd").paragraph_diff).to eq(
[["a", :common], ["b", :delete], ["c", :common], ["d", :add]],
)
end
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it "pairs as many elements as possible" do
expect(ONPDiff.new("abcd", "abef").paragraph_diff).to eq(
[["a", :common], ["b", :common], ["e", :add], ["c", :delete], ["f", :add], ["d", :delete]],
)
expect(ONPDiff.new("abcde", "abfg").paragraph_diff).to eq(
[
["a", :common],
["b", :common],
["c", :delete],
["d", :delete],
["f", :add],
["e", :delete],
["g", :add],
],
)
expect(ONPDiff.new("abcd", "abefg").paragraph_diff).to eq(
[
["a", :common],
["b", :common],
["e", :add],
["f", :add],
["c", :delete],
["g", :add],
["d", :delete],
],
)
end
end
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end