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Copy pathANKCoreInteger+Subtraction.swift
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ANKCoreInteger+Subtraction.swift
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//=----------------------------------------------------------------------------=
// This source file is part of the AwesomeNumbersKit open source project.
//
// Copyright (c) 2022 Oscar Byström Ericsson
// Licensed under Apache License, Version 2.0
//
// See http://www.apache.org/licenses/LICENSE-2.0 for license information.
//=----------------------------------------------------------------------------=
#if DEBUG
import ANKCoreKit
import XCTest
//*============================================================================*
// MARK: * ANK x Core Integer x Subtraction
//*============================================================================*
final class ANKCoreIntegerTestsOnSubtraction: XCTestCase {
typealias T = any ANKCoreInteger.Type
//=------------------------------------------------------------------------=
// MARK: State
//=------------------------------------------------------------------------=
let types: [T] = ANKCoreIntegerTests.types
//=------------------------------------------------------------------------=
// MARK: Tests
//=------------------------------------------------------------------------=
func testSubtracting() {
func whereIsSigned<T>(_ type: T.Type) where T: ANKCoreInteger {
ANKAssertSubtraction(T( 1), T( 2), T(-1))
ANKAssertSubtraction(T( 1), T( 1), T( 0))
ANKAssertSubtraction(T( 1), T( 0), T( 1))
ANKAssertSubtraction(T( 1), T(-1), T( 2))
ANKAssertSubtraction(T( 1), T(-2), T( 3))
ANKAssertSubtraction(T( 0), T( 2), T(-2))
ANKAssertSubtraction(T( 0), T( 1), T(-1))
ANKAssertSubtraction(T( 0), T( 0), T( 0))
ANKAssertSubtraction(T( 0), T(-1), T( 1))
ANKAssertSubtraction(T( 0), T(-2), T( 2))
ANKAssertSubtraction(T(-1), T( 2), T(-3))
ANKAssertSubtraction(T(-1), T( 1), T(-2))
ANKAssertSubtraction(T(-1), T( 0), T(-1))
ANKAssertSubtraction(T(-1), T(-1), T( 0))
ANKAssertSubtraction(T(-1), T(-2), T( 1))
}
func whereIsUnsigned<T>(_ type: T.Type) where T: ANKCoreInteger {
ANKAssertSubtraction(T(3), T(0), T(3))
ANKAssertSubtraction(T(3), T(1), T(2))
ANKAssertSubtraction(T(3), T(2), T(1))
ANKAssertSubtraction(T(3), T(3), T(0))
}
for type: T in types {
type.isSigned ? whereIsSigned(type) : whereIsUnsigned(type)
}
}
func testSubtractingReportingOverflow() {
func whereIsSigned<T>(_ type: T.Type) where T: ANKCoreInteger {
ANKAssertSubtraction(T.min, T( 2), T.max - T(1), true )
ANKAssertSubtraction(T.max, T( 2), T.max - T(2), false)
ANKAssertSubtraction(T.min, T(-2), T.min + T(2), false)
ANKAssertSubtraction(T.max, T(-2), T.min + T(1), true )
}
func whereIsUnsigned<T>(_ type: T.Type) where T: ANKCoreInteger {
ANKAssertSubtraction(T.min, T(2), T.max - T(1), true )
ANKAssertSubtraction(T.max, T(2), T.max - T(2), false)
}
for type: T in types {
type.isSigned ? whereIsSigned(type) : whereIsUnsigned(type)
}
}
//=------------------------------------------------------------------------=
// MARK: Tests x Miscellaneous
//=------------------------------------------------------------------------=
func testOverloadsAreUnambiguousWhenUsingIntegerLiterals() {
func becauseThisCompilesSuccessfully(_ x: inout some ANKCoreInteger) {
XCTAssertNotNil(x -= 0)
XCTAssertNotNil(x &-= 0)
XCTAssertNotNil(x.subtractReportingOverflow(0))
XCTAssertNotNil(x - 0)
XCTAssertNotNil(x &- 0)
XCTAssertNotNil(x.subtractingReportingOverflow(0))
}
}
}
#endif