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ra1028#17: Add stress tests of continous random collection view updat…
…es in a one dimentional collection
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| import XCTest | ||
| import UIKit | ||
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| private let collectionSize = 100 | ||
| private let iterationsCount = 100 | ||
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| final class DifferenceKitStressTests: XCTestCase { | ||
| func test_differenceKit_doesNotCrashUICollectionView_duringStressCollectionChanges_1() { | ||
| performTest_differenceKit_doesNotCrashUICollectionView_duringStressCollectionChanges() | ||
| } | ||
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| func test_differenceKit_doesNotCrashUICollectionView_duringStressCollectionChanges_2() { | ||
| performTest_differenceKit_doesNotCrashUICollectionView_duringStressCollectionChanges() | ||
| } | ||
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| func test_differenceKit_doesNotCrashUICollectionView_duringStressCollectionChanges_3() { | ||
| performTest_differenceKit_doesNotCrashUICollectionView_duringStressCollectionChanges() | ||
| } | ||
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| func test_differenceKit_doesNotCrashUICollectionView_duringStressCollectionChanges_4() { | ||
| performTest_differenceKit_doesNotCrashUICollectionView_duringStressCollectionChanges() | ||
| } | ||
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| func test_differenceKit_doesNotCrashUICollectionView_duringStressCollectionChanges_5() { | ||
| performTest_differenceKit_doesNotCrashUICollectionView_duringStressCollectionChanges() | ||
| } | ||
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| // MARK: - Private | ||
| private func performTest_differenceKit_doesNotCrashUICollectionView_duringStressCollectionChanges() { | ||
| let expectations = (0..<iterationsCount).map { | ||
| expectation(description: "async expectation of iteration \($0)") | ||
| } | ||
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| performTests(expectations: expectations) | ||
| waitForExpectations(timeout: 60) | ||
| } | ||
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| private func performTests(expectations: [XCTestExpectation]) { | ||
| performTest( | ||
| index: 0, | ||
| expectations: expectations, | ||
| previousCellDataList: [] | ||
| ) | ||
| } | ||
|
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| private func performTest( | ||
| index: Int, | ||
| expectations: [XCTestExpectation], | ||
| previousCellDataList: [CellData]) | ||
| { | ||
| guard index < expectations.count else { return } | ||
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| autoreleasepool { | ||
| print("testing iteration \(index)") | ||
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| let cellDataGenerator = CellDataGenerator() | ||
|
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| // Given | ||
| let cellDataGeneratorResult: CellDataGeneratorResult | ||
| if index == 0 { | ||
| cellDataGeneratorResult = cellDataGenerator | ||
| .generateCellData(count: collectionSize) | ||
| } else if index == iterationsCount / 2 { | ||
| // Special case: applying no changes to original data | ||
| cellDataGeneratorResult = cellDataGenerator | ||
| .performNoActionsOnCellData( | ||
| previousCellDataList | ||
| ) | ||
| } else { | ||
| cellDataGeneratorResult = cellDataGenerator | ||
| .performRandomActionsOnCellData( | ||
| previousCellDataList, | ||
| minimumCountAfterActions: collectionSize / 10, | ||
| maximumCountAfterActions: collectionSize * 10 | ||
| ) | ||
| } | ||
|
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| print(" from \(cellDataGeneratorResult.from.count), to: \(cellDataGeneratorResult.to.count).") | ||
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| print(" deletes \(cellDataGeneratorResult.deletes), " | ||
| + "inserts: \(cellDataGeneratorResult.inserts), " | ||
| + "moves \(cellDataGeneratorResult.moves), " | ||
| + "updates: \(cellDataGeneratorResult.updates)." | ||
| ) | ||
|
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| // When | ||
| let collectionViewUpdater = CollectionViewUpdater() | ||
| collectionViewUpdater.updateCollectionView( | ||
| from: cellDataGeneratorResult.from, | ||
| to: cellDataGeneratorResult.to, | ||
| completion: { [weak self] result in | ||
| // Then | ||
| switch result { | ||
| case let .exception(exception): | ||
| XCTFail("Failed to update collection view using DifferenceKit. exception: \(exception)") | ||
| case .noUpdateRequired: | ||
| break | ||
| case let .success(visibleCellDataList, expectedCellDataList): | ||
| XCTAssert( | ||
| visibleCellDataList.count == expectedCellDataList.count, | ||
| "Update the layout to fit all cells in the screen" | ||
| ) | ||
|
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| let zippedCellDataLists = zip(visibleCellDataList, expectedCellDataList) | ||
| for (index, (visibleCellData, expectedCellData)) in zippedCellDataLists.enumerated() { | ||
| XCTAssert( | ||
| visibleCellData.isContentEqual(to: expectedCellData), | ||
| "visible cell data and expected cell data are not in sync at index: \(index)" | ||
| ) | ||
| } | ||
| } | ||
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| print("") | ||
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| collectionViewUpdater.cleanUp() | ||
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| expectations[index].fulfill() | ||
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| DispatchQueue.main.async { | ||
| self?.performTest( | ||
| index: index + 1, | ||
| expectations: expectations, | ||
| previousCellDataList: cellDataGeneratorResult.to | ||
| ) | ||
| } | ||
| } | ||
| ) | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| import UIKit | ||
|
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| final class Cell: UICollectionViewCell { | ||
| var cellData: CellData? | ||
|
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| static let reuseIdentifier = "Cell.reuseIdentifier" | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| import DifferenceKit | ||
| import XCTest | ||
|
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| final class CellData: Differentiable { | ||
| // MARK: - Properties | ||
| let title: String | ||
| let subtitle: String | ||
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| // MARK: - Differentiable | ||
| let differenceIdentifier: UUID | ||
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| // MARK: - Init | ||
| init( | ||
| differenceIdentifier: UUID, | ||
| title: String, | ||
| subtitle: String) | ||
| { | ||
| self.differenceIdentifier = differenceIdentifier | ||
| self.title = title | ||
| self.subtitle = subtitle | ||
| } | ||
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| // MARK: - Differentiable | ||
| func isContentEqual(to source: CellData) -> Bool { | ||
| XCTAssert( | ||
| self.differenceIdentifier == source.differenceIdentifier, | ||
| "We expect the algorythm to compare items only with same `differenceIdentifier`" | ||
| ) | ||
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| return self.title == source.title | ||
| && self.subtitle == source.subtitle | ||
| } | ||
| } |
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