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/*
This source file is part of the Swift.org open source project
Copyright (c) 2021 Apple Inc. and the Swift project authors
Licensed under Apache License v2.0 with Runtime Library Exception
See https://swift.org/LICENSE.txt for license information
See https://swift.org/CONTRIBUTORS.txt for Swift project authors
*/
import XCTest
@testable import SwiftDocCUtilities
class Sequence_UniqueTests: XCTestCase {
func testEmpty() {
let empty = [Int]()
XCTAssert(empty.uniqueElements(by: { $0 }).isEmpty)
}
func testOrderIsPreserved() {
let original = 0..<10
XCTAssertEqual(original.uniqueElements(by: { $0 }), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
let shuffled = (0..<10).shuffled()
XCTAssertEqual(shuffled.uniqueElements(by: { $0 }), shuffled)
}
func testRemovesDuplicated() {
let original = [1, 2, 1, 3, 2, 1, 4, 3, 2, 1]
XCTAssertEqual(original.uniqueElements(by: { $0 }), [1, 2, 3, 4])
}
func testKeyPath() {
struct Pair: Equatable { // Equatable for the test assertion below
let number: Int
let letter: Character
init(_ number: Int, _ letter: Character) {
self.number = number
self.letter = letter
}
}
let original = [Pair(1, "a"), Pair(1, "b"),
Pair(2, "a"), Pair(2, "b")]
XCTAssertEqual(original.uniqueElements(by: { $0.number }), [Pair(1, "a"), Pair(2, "a")])
XCTAssertEqual(original.uniqueElements(by: { $0.letter }), [Pair(1, "a"), Pair(1, "b")])
}
}
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