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NBKDoubleWidth+Strides.swift
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//=----------------------------------------------------------------------------=
// This source file is part of the Numberick open source project.
//
// Copyright (c) 2023 Oscar Byström Ericsson
// Licensed under Apache License, Version 2.0
//
// See http://www.apache.org/licenses/LICENSE-2.0 for license information.
//=----------------------------------------------------------------------------=
import NBKCoreKit
import NBKDoubleWidthKit
import XCTest
private typealias X64 = [UInt64]
private typealias X32 = [UInt64]
//*============================================================================*
// MARK: * NBK x Double Width x Strides x Int256
//*============================================================================*
final class NBKDoubleWidthTestsOnStridesAsInt256: XCTestCase {
typealias T = Int256
//=------------------------------------------------------------------------=
// MARK: Tests
//=------------------------------------------------------------------------=
func testAdvancedBy() {
XCTAssertEqual(T.min.advanced(by: Int.max), T.min + T(Int.max))
XCTAssertEqual(T( ).advanced(by: Int.max), T( ) + T(Int.max))
XCTAssertEqual(T( ).advanced(by: -Int.max), T( ) - T(Int.max))
XCTAssertEqual(T.max.advanced(by: -Int.max), T.max - T(Int.max))
XCTAssertEqual(T( ).advanced(by: Int.min), T( ) - T(Int.max) - T(1))
XCTAssertEqual(T.max.advanced(by: Int.min), T.max - T(Int.max) - T(1))
}
func testDistanceTo() {
XCTAssertEqual(T.min.distance(to: T.min.advanced(by: Int.max)), Int.max)
XCTAssertEqual(T( ).distance(to: T( ).advanced(by: Int.max)), Int.max)
XCTAssertEqual(T( ).distance(to: T( ).advanced(by: -Int.max)), -Int.max)
XCTAssertEqual(T.max.distance(to: T.max.advanced(by: -Int.max)), -Int.max)
XCTAssertEqual(T( ).distance(to: T( ).advanced(by: Int.min)), Int.min)
XCTAssertEqual(T.max.distance(to: T.max.advanced(by: Int.min)), Int.min)
}
func testDistanceToExpectingCrashBecauseStrideCannotRepresentDistance() {
//XCTAssertNil(T.min.distance(to: T.min.advanced(by: Int.max).advanced(by: 1)))
//XCTAssertNil(T( ).distance(to: T( ).advanced(by: Int.max).advanced(by: 1)))
//XCTAssertNil(T( ).distance(to: T( ).advanced(by: Int.min).advanced(by: -1)))
//XCTAssertNil(T.max.distance(to: T.max.advanced(by: Int.min).advanced(by: -1)))
}
}
//*============================================================================*
// MARK: * NBK x Double Width x Strides x UInt256
//*============================================================================*
final class NBKDoubleWidthTestsOnStridesAsUInt256: XCTestCase {
typealias T = UInt256
//=------------------------------------------------------------------------=
// MARK: Tests
//=------------------------------------------------------------------------=
func testAdvancedBy() {
XCTAssertEqual(T( ).advanced(by: Int.max), T( ) + T(Int.max))
XCTAssertEqual(T.max.advanced(by: -Int.max), T.max - T(Int.max))
XCTAssertEqual(T.max.advanced(by: Int.min), T.max - T(Int.max) - T(1))
}
func testDistanceTo() {
XCTAssertEqual(T( ).distance(to: T( ).advanced(by: Int.max)), Int.max)
XCTAssertEqual(T.max.distance(to: T.max.advanced(by: -Int.max)), -Int.max)
XCTAssertEqual(T.max.distance(to: T.max.advanced(by: Int.min)), Int.min)
}
func testDistanceToExpectingCrashBecauseStrideCannotRepresentDistance() {
//XCTAssertNil(T( ).distance(to: T( ).advanced(by: Int.max).advanced(by: 1)))
//XCTAssertNil(T.max.distance(to: T.max.advanced(by: Int.min).advanced(by: -1)))
}
}