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services/project-history/test/unit/js/OperationsCompressor/OperationsCompressorTests.js

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+import { expect } from 'chai'
+import Core from 'overleaf-editor-core'
+import * as OperationsCompressor from '../../../../app/js/OperationsCompressor.js'
+
+describe('OperationsCompressor', function () {
+  function edit(pathname, textOperationJsonObject) {
+    return Core.Operation.editFile(
+      pathname,
+      Core.TextOperation.fromJSON({ textOperation: textOperationJsonObject })
+    )
+  }
+
+  it('collapses edit operations', function () {
+    const compressedOperations = OperationsCompressor.compressOperations([
+      edit('main.tex', [3, 'foo', 17]),
+      edit('main.tex', [10, -5, 8]),
+    ])
+
+    expect(compressedOperations).to.have.length(1)
+    expect(compressedOperations[0]).to.deep.equal(
+      edit('main.tex', [3, 'foo', 4, -5, 8])
+    )
+  })
+
+  it('only collapses consecutive composable edit operations', function () {
+    const compressedOperations = OperationsCompressor.compressOperations([
+      edit('main.tex', [3, 'foo', 17]),
+      edit('main.tex', [10, -5, 8]),
+      edit('not-main.tex', [3, 'foo', 17]),
+      edit('not-main.tex', [10, -5, 8]),
+    ])
+
+    expect(compressedOperations).to.have.length(2)
+    expect(compressedOperations[0]).to.deep.equal(
+      edit('main.tex', [3, 'foo', 4, -5, 8])
+    )
+    expect(compressedOperations[1]).to.deep.equal(
+      edit('not-main.tex', [3, 'foo', 4, -5, 8])
+    )
+  })
+
+  it("don't collapses text operations around non-composable operations", function () {
+    const compressedOperations = OperationsCompressor.compressOperations([
+      edit('main.tex', [3, 'foo', 17]),
+      Core.Operation.moveFile('main.tex', 'new-main.tex'),
+      edit('new-main.tex', [10, -5, 8]),
+      edit('new-main.tex', [6, 'bar', 12]),
+    ])
+
+    expect(compressedOperations).to.have.length(3)
+    expect(compressedOperations[0]).to.deep.equal(
+      edit('main.tex', [3, 'foo', 17])
+    )
+    expect(compressedOperations[1].newPathname).to.deep.equal('new-main.tex')
+    expect(compressedOperations[2]).to.deep.equal(
+      edit('new-main.tex', [6, 'bar', 4, -5, 8])
+    )
+  })
+
+  it('handle empty operations', function () {
+    const compressedOperations = OperationsCompressor.compressOperations([])
+
+    expect(compressedOperations).to.have.length(0)
+  })
+
+  it('handle single operations', function () {
+    const compressedOperations = OperationsCompressor.compressOperations([
+      edit('main.tex', [3, 'foo', 17]),
+    ])
+
+    expect(compressedOperations).to.have.length(1)
+    expect(compressedOperations[0]).to.deep.equal(
+      edit('main.tex', [3, 'foo', 17])
+    )
+  })
+})