mirror of
https://github.com/overleaf/overleaf.git
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337 lines
10 KiB
CoffeeScript
337 lines
10 KiB
CoffeeScript
sinon = require('sinon')
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chai = require('chai')
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should = chai.should()
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expect = chai.expect
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modulePath = "../../../../app/js/DiffGenerator.js"
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SandboxedModule = require('sandboxed-module')
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describe "DiffGenerator", ->
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beforeEach ->
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@DiffGenerator = SandboxedModule.require modulePath
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@ts = Date.now()
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@user_id = "mock-user-id"
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@user_id_2 = "mock-user-id-2"
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@meta = {
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start_ts: @ts, end_ts: @ts, user_id: @user_id
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}
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describe "rewindOp", ->
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describe "rewinding an insert", ->
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it "should undo the insert", ->
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content = "hello world"
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rewoundContent = @DiffGenerator.rewindOp content, { p: 6, i: "wo" }
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rewoundContent.should.equal "hello rld"
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describe "rewinding a delete", ->
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it "should undo the delete", ->
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content = "hello rld"
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rewoundContent = @DiffGenerator.rewindOp content, { p: 6, d: "wo" }
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rewoundContent.should.equal "hello world"
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describe "with an inconsistent update", ->
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it "should throw an error", ->
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content = "hello world"
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expect( () =>
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@DiffGenerator.rewindOp content, { p: 6, i: "foo" }
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).to.throw(@DiffGenerator.ConsistencyError)
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describe "rewindUpdate", ->
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it "should rewind ops in reverse", ->
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content = "aaabbbccc"
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update =
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op: [{ p: 3, i: "bbb" }, { p: 6, i: "ccc" }]
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rewoundContent = @DiffGenerator.rewindUpdate content, update
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rewoundContent.should.equal "aaa"
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describe "rewindUpdates", ->
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it "should rewind updates in reverse", ->
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content = "aaabbbccc"
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updates = [
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{ op: [{ p: 3, i: "bbb" }] },
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{ op: [{ p: 6, i: "ccc" }] }
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]
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rewoundContent = @DiffGenerator.rewindUpdates content, updates
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rewoundContent.should.equal "aaa"
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describe "buildDiff", ->
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beforeEach ->
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@diff = [ u: "mock-diff" ]
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@content = "Hello world"
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@updates = [
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{ i: "mock-update-1" }
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{ i: "mock-update-2" }
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{ i: "mock-update-3" }
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]
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@DiffGenerator.applyUpdateToDiff = sinon.stub().returns(@diff)
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@DiffGenerator.compressDiff = sinon.stub().returns(@diff)
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@result = @DiffGenerator.buildDiff(@content, @updates)
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it "should return the diff", ->
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@result.should.deep.equal @diff
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it "should build the content into an initial diff", ->
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@DiffGenerator.applyUpdateToDiff
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.calledWith([{
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u: @content
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}], @updates[0])
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.should.equal true
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it "should apply each update", ->
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for update in @updates
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@DiffGenerator.applyUpdateToDiff
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.calledWith(sinon.match.any, update)
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.should.equal true
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it "should compress the diff", ->
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@DiffGenerator.compressDiff
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.calledWith(@diff)
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.should.equal true
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describe "compressDiff", ->
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describe "with adjacent inserts with the same user_id", ->
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it "should create one update with combined meta data and min/max timestamps", ->
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diff = @DiffGenerator.compressDiff([
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{ i: "foo", meta: { start_ts: 10, end_ts: 20, user: { id: @user_id } }}
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{ i: "bar", meta: { start_ts: 5, end_ts: 15, user: { id: @user_id } }}
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])
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expect(diff).to.deep.equal([
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{ i: "foobar", meta: { start_ts: 5, end_ts: 20, user: { id: @user_id } }}
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])
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describe "with adjacent inserts with different user_ids", ->
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it "should leave the inserts unchanged", ->
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input = [
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{ i: "foo", meta: { start_ts: 10, end_ts: 20, user: { id: @user_id } }}
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{ i: "bar", meta: { start_ts: 5, end_ts: 15, user: { id: @user_id_2 } }}
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]
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output = @DiffGenerator.compressDiff(input)
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expect(output).to.deep.equal(input)
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describe "with adjacent deletes with the same user_id", ->
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it "should create one update with combined meta data and min/max timestamps", ->
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diff = @DiffGenerator.compressDiff([
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{ d: "foo", meta: { start_ts: 10, end_ts: 20, user: { id: @user_id } }}
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{ d: "bar", meta: { start_ts: 5, end_ts: 15, user: { id: @user_id } }}
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])
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expect(diff).to.deep.equal([
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{ d: "foobar", meta: { start_ts: 5, end_ts: 20, user: { id: @user_id } }}
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])
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describe "with adjacent deletes with different user_ids", ->
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it "should leave the deletes unchanged", ->
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input = [
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{ d: "foo", meta: { start_ts: 10, end_ts: 20, user: { id: @user_id } }}
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{ d: "bar", meta: { start_ts: 5, end_ts: 15, user: { id: @user_id_2 } }}
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]
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output = @DiffGenerator.compressDiff(input)
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expect(output).to.deep.equal(input)
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describe "applyUpdateToDiff", ->
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describe "an insert", ->
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it "should insert into the middle of (u)nchanged text", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { u: "foobar" } ],
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{ op: [{ p: 3, i: "baz" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ u: "foo" }
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{ i: "baz", meta: @meta }
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{ u: "bar" }
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])
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it "should insert into the start of (u)changed text", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { u: "foobar" } ],
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{ op: [{ p: 0, i: "baz" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ i: "baz", meta: @meta }
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{ u: "foobar" }
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])
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it "should insert into the end of (u)changed text", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { u: "foobar" } ],
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{ op: [{ p: 6, i: "baz" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ u: "foobar" }
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{ i: "baz", meta: @meta }
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])
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it "should insert into the middle of (i)inserted text", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { i: "foobar", meta: @meta } ],
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{ op: [{ p: 3, i: "baz" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ i: "foo", meta: @meta }
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{ i: "baz", meta: @meta }
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{ i: "bar", meta: @meta }
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])
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it "should not count deletes in the running length total", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[
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{ d: "deleted", meta: @meta }
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{ u: "foobar" }
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],
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{ op: [{ p: 3, i: "baz" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ d: "deleted", meta: @meta }
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{ u: "foo" }
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{ i: "baz", meta: @meta }
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{ u: "bar" }
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])
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describe "a delete", ->
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describe "deleting unchanged text", ->
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it "should delete from the middle of (u)nchanged text", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { u: "foobazbar" } ],
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{ op: [{ p: 3, d: "baz" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ u: "foo" }
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{ d: "baz", meta: @meta }
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{ u: "bar" }
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])
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it "should delete from the start of (u)nchanged text", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { u: "foobazbar" } ],
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{ op: [{ p: 0, d: "foo" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ d: "foo", meta: @meta }
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{ u: "bazbar" }
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])
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it "should delete from the end of (u)nchanged text", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { u: "foobazbar" } ],
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{ op: [{ p: 6, d: "bar" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ u: "foobaz" }
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{ d: "bar", meta: @meta }
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])
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it "should delete across multiple (u)changed text parts", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { u: "foo" }, { u: "baz" }, { u: "bar" } ],
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{ op: [{ p: 2, d: "obazb" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ u: "fo" }
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{ d: "o", meta: @meta }
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{ d: "baz", meta: @meta }
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{ d: "b", meta: @meta }
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{ u: "ar" }
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])
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describe "deleting inserts", ->
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it "should delete from the middle of (i)nserted text", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { i: "foobazbar", meta: @meta } ],
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{ op: [{ p: 3, d: "baz" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ i: "foo", meta: @meta }
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{ i: "bar", meta: @meta }
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])
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it "should delete from the start of (u)nchanged text", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { i: "foobazbar", meta: @meta } ],
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{ op: [{ p: 0, d: "foo" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ i: "bazbar", meta: @meta }
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])
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it "should delete from the end of (u)nchanged text", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { i: "foobazbar", meta: @meta } ],
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{ op: [{ p: 6, d: "bar" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ i: "foobaz", meta: @meta }
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])
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it "should delete across multiple (u)changed and (i)nserted text parts", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { u: "foo" }, { i: "baz", meta: @meta }, { u: "bar" } ],
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{ op: [{ p: 2, d: "obazb" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ u: "fo" }
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{ d: "o", meta: @meta }
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{ d: "b", meta: @meta }
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{ u: "ar" }
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])
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describe "deleting over existing deletes", ->
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it "should delete across multiple (u)changed and (d)deleted text parts", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { u: "foo" }, { d: "baz", meta: @meta }, { u: "bar" } ],
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{ op: [{ p: 2, d: "ob" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ u: "fo" }
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{ d: "o", meta: @meta }
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{ d: "baz", meta: @meta }
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{ d: "b", meta: @meta }
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{ u: "ar" }
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])
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describe "deleting when the text doesn't match", ->
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it "should throw an error when deleting from the middle of (u)nchanged text", ->
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expect(
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() => @DiffGenerator.applyUpdateToDiff(
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[ { u: "foobazbar" } ],
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{ op: [{ p: 3, d: "xxx" }], meta: @meta }
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)
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).to.throw(@DiffGenerator.ConsistencyError)
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it "should throw an error when deleting from the start of (u)nchanged text", ->
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expect(
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() => @DiffGenerator.applyUpdateToDiff(
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[ { u: "foobazbar" } ],
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{ op: [{ p: 0, d: "xxx" }], meta: @meta }
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)
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).to.throw(@DiffGenerator.ConsistencyError)
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it "should throw an error when deleting from the end of (u)nchanged text", ->
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expect(
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() => @DiffGenerator.applyUpdateToDiff(
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[ { u: "foobazbar" } ],
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{ op: [{ p: 6, d: "xxx" }] , meta: @meta }
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)
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).to.throw(@DiffGenerator.ConsistencyError)
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describe "when the last update in the existing diff is a delete", ->
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it "should insert the new update before the delete", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { u: "foo" }, { d: "bar", meta: @meta } ],
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{ op: [{ p: 3, i: "baz" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ u: "foo" }
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{ i: "baz", meta: @meta }
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{ d: "bar", meta: @meta }
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])
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describe "when the only update in the existing diff is a delete", ->
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it "should insert the new update after the delete", ->
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diff = @DiffGenerator.applyUpdateToDiff(
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[ { d: "bar", meta: @meta } ],
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{ op: [{ p: 0, i: "baz" }], meta: @meta }
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)
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expect(diff).to.deep.equal([
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{ d: "bar", meta: @meta }
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{ i: "baz", meta: @meta }
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])
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