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// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016, 2019 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 the list of Swift project authors
//
#if NS_FOUNDATION_ALLOWS_TESTABLE_IMPORT
#if canImport(SwiftFoundation) && !DEPLOYMENT_RUNTIME_OBJC
@testable import SwiftFoundation
#else
@testable import Foundation
#endif
#endif
class TestProgressFraction : XCTestCase {
#if NS_FOUNDATION_ALLOWS_TESTABLE_IMPORT // _ProgressFraction is an internal type
func test_equal() {
let f1 = _ProgressFraction(completed: 5, total: 10)
let f2 = _ProgressFraction(completed: 100, total: 200)
XCTAssertEqual(f1, f2)
let f3 = _ProgressFraction(completed: 3, total: 10)
XCTAssertNotEqual(f1, f3)
let f4 = _ProgressFraction(completed: 5, total: 10)
XCTAssertEqual(f1, f4)
}
func test_addSame() {
let f1 = _ProgressFraction(completed: 5, total: 10)
let f2 = _ProgressFraction(completed: 3, total: 10)
let r = f1 + f2
XCTAssertEqual(r.completed, 8)
XCTAssertEqual(r.total, 10)
}
func test_addDifferent() {
let f1 = _ProgressFraction(completed: 5, total: 10)
let f2 = _ProgressFraction(completed: 300, total: 1000)
let r = f1 + f2
XCTAssertEqual(r.completed, 800)
XCTAssertEqual(r.total, 1000)
}
func test_subtract() {
let f1 = _ProgressFraction(completed: 5, total: 10)
let f2 = _ProgressFraction(completed: 3, total: 10)
let r = f1 - f2
XCTAssertEqual(r.completed, 2)
XCTAssertEqual(r.total, 10)
}
func test_multiply() {
let f1 = _ProgressFraction(completed: 5, total: 10)
let f2 = _ProgressFraction(completed: 1, total: 2)
let r = f1 * f2
XCTAssertEqual(r.completed, 5)
XCTAssertEqual(r.total, 20)
}
func test_simplify() {
let f1 = _ProgressFraction(completed: 5, total: 10)
let f2 = _ProgressFraction(completed: 3, total: 10)
let r = (f1 + f2).simplified()
XCTAssertEqual(r.completed, 4)
XCTAssertEqual(r.total, 5)
}
func test_overflow() {
// These prime numbers are problematic for overflowing
let denominators : [Int64] = [5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 69]
var f1 = _ProgressFraction(completed: 1, total: 3)
for d in denominators {
f1 = f1 + _ProgressFraction(completed: 1, total: d)
}
let fractionResult = f1.fractionCompleted
var expectedResult = 1.0 / 3.0
for d in denominators {
expectedResult = expectedResult + 1.0 / Double(d)
}
XCTAssertEqual(fractionResult, expectedResult, accuracy: 0.00001)
}
func test_addOverflow() {
// These prime numbers are problematic for overflowing
let denominators : [Int64] = [5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 69]
var f1 = _ProgressFraction(completed: 1, total: 3)
for d in denominators {
f1 = f1 + _ProgressFraction(completed: 1, total: d)
}
// f1 should be in overflow
XCTAssertTrue(f1.overflowed)
let f2 = _ProgressFraction(completed: 1, total: 4) + f1
// f2 should also be in overflow
XCTAssertTrue(f2.overflowed)
// And it should have completed value of about 1.0/4.0 + f1.fractionCompleted
let expected = (1.0 / 4.0) + f1.fractionCompleted
XCTAssertEqual(expected, f2.fractionCompleted, accuracy: 0.00001)
}
func test_andAndSubtractOverflow() {
let f1 = _ProgressFraction(completed: 48, total: 60)
let f2 = _ProgressFraction(completed: 5880, total: 7200)
let f3 = _ProgressFraction(completed: 7048893638467736640, total: 8811117048084670800)
let result1 = (f3 - f1) + f2
XCTAssertTrue(result1.completed > 0)
let result2 = (f3 - f2) + f1
XCTAssertTrue(result2.completed < 60)
}
func test_fractionFromDouble() {
let d = 4.25 // exactly representable in binary
let f1 = _ProgressFraction(double: d)
let simplified = f1.simplified()
XCTAssertEqual(simplified.completed, 17)
XCTAssertEqual(simplified.total, 4)
}
func test_unnecessaryOverflow() {
// just because a fraction has a large denominator doesn't mean it needs to overflow
let f1 = _ProgressFraction(completed: (Int64.max - 1) / 2, total: Int64.max - 1)
let f2 = _ProgressFraction(completed: 1, total: 16)
let r = f1 + f2
XCTAssertFalse(r.overflowed)
}
#endif
}
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