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// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016. 2018 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 TestPipe: XCTestCase {
#if NS_FOUNDATION_ALLOWS_TESTABLE_IMPORT
func test_MaxPipes() {
// Try and create enough pipes to exhaust the process's limits. 1024 is a reasonable
// hard limit for the test. This is reached when testing on Linux (at around 488 pipes)
// but not on macOS.
var pipes: [Pipe] = []
let maxPipes = 1024
pipes.reserveCapacity(maxPipes)
for _ in 1...maxPipes {
let pipe = Pipe()
if !pipe.fileHandleForReading._isPlatformHandleValid {
#if os(Windows)
XCTAssertEqual(pipe.fileHandleForReading._handle, pipe.fileHandleForWriting._handle)
#else
XCTAssertEqual(pipe.fileHandleForReading.fileDescriptor, pipe.fileHandleForWriting.fileDescriptor)
#endif
break
}
pipes.append(pipe)
}
pipes = []
}
#endif
func test_Pipe() throws {
let aPipe = Pipe()
let text = "test-pipe"
// First write some data into the pipe
let stringAsData = try XCTUnwrap(text.data(using: .utf8))
try aPipe.fileHandleForWriting.write(contentsOf: stringAsData)
// SR-10240 - Check empty Data() can be written without crashing
aPipe.fileHandleForWriting.write(Data())
// Then read it out again
let data = try XCTUnwrap(aPipe.fileHandleForReading.read(upToCount: stringAsData.count))
// Confirm that we did read data
XCTAssertEqual(data.count, stringAsData.count, "Expected to read \(String(describing:stringAsData.count)) from pipe but read \(data.count) instead")
// Confirm the data can be converted to a String
let convertedData = String(data: data, encoding: .utf8)
XCTAssertNotNil(convertedData)
// Confirm the data written in is the same as the data we read
XCTAssertEqual(text, convertedData)
}
}
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