50 lines
2.1 KiB
Swift
50 lines
2.1 KiB
Swift
//
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// Copyright 2023 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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//
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import Foundation
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@testable import Signal
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class MessageLoaderBatchTest: XCTestCase {
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func testMerge() {
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func makeBatch(_ uniqueIds: [String]) -> MessageLoaderBatch {
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return MessageLoaderBatch(canLoadNewer: true, canLoadOlder: true, uniqueIds: uniqueIds)
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}
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let originalBatch = makeBatch(["D", "E", "F", "G"])
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func merge(_ batch: MessageLoaderBatch) -> [String] {
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var mutableBatch = originalBatch
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mutableBatch.mergeBatchIfOverlap(batch)
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return mutableBatch.uniqueIds
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}
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XCTAssertEqual(merge(makeBatch(["A", "B"])), ["D", "E", "F", "G"])
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XCTAssertEqual(merge(makeBatch(["B", "C", "D", "E"])), ["B", "C", "D", "E", "F", "G"])
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XCTAssertEqual(merge(makeBatch(["E", "F"])), ["D", "E", "F", "G"])
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XCTAssertEqual(merge(makeBatch(["F", "G", "H", "I"])), ["D", "E", "F", "G", "H", "I"])
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XCTAssertEqual(merge(makeBatch(["I", "J"])), ["D", "E", "F", "G"])
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}
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func testMergeAtEnd() {
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do {
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// This batch has three elements but doesn't know it's reached the end.
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var batch = MessageLoaderBatch(canLoadNewer: true, canLoadOlder: true, uniqueIds: ["A", "B", "C"])
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// This batch has a single element, but it knows that it's the newest element.
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batch.mergeBatchIfOverlap(MessageLoaderBatch(canLoadNewer: false, canLoadOlder: true, uniqueIds: ["C"]))
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// So the merged batch should know that it's at the end.
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XCTAssertFalse(batch.canLoadNewer)
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}
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do {
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// This batch has three elements but doesn't know it's reached the end.
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var batch = MessageLoaderBatch(canLoadNewer: true, canLoadOlder: true, uniqueIds: ["A", "B", "C"])
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// This batch has a single element, and it also doesn't know it's reached the end.
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batch.mergeBatchIfOverlap(MessageLoaderBatch(canLoadNewer: true, canLoadOlder: true, uniqueIds: ["C"]))
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// So the merged batch should know that it's at the end.
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XCTAssertTrue(batch.canLoadNewer)
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}
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}
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}
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