TestPipe.swift

// 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
@testableimport SwiftFoundation
#else
@testableimport Foundation
#endif
#endif


classTestPipe: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.

varpipes:[Pipe]=[]
letmaxPipes=1024
 pipes.reserveCapacity(maxPipes)
for_in1...maxPipes {
letpipe=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{
letaPipe=Pipe()
lettext="test-pipe"

 // First write some data into the pipe
letstringAsData=tryXCTUnwrap(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
letdata=tryXCTUnwrap(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
letconvertedData=String(data: data, encoding:.utf8)
XCTAssertNotNil(convertedData)

 // Confirm the data written in is the same as the data we read
XCTAssertEqual(text, convertedData)
}
}