Tests: enable tests on Windows (apple#198)

This adds support for running the tests on Windows.  However, running
the tests on Windows requires SPM currently.  While it is possible to
enable executing tests with CMake, the expectation is that SPM builds
would be the most common and CMake is largely used for bootstrapping.
The changes here require alterations to remove the POSIX threading to
get the thread ID.  Additionally, pipes on Windows are not similar to
pipes on Unix platforms. Finally, we must add Windows to the platform
list, which is temporary (it would be better to use test discovery in
SPM).

Author: compnerd

Tests/LinuxMain.swift

@@ -22,7 +22,7 @@ import XCTest
 /// Do NOT edit this file directly as it will be regenerated automatically when needed.
 ///
 
-#if os(Linux) || os(FreeBSD)
+#if os(Linux) || os(FreeBSD) || os(Windows)
 @testable import LoggingTests
 
 XCTMain([

Tests/LoggingTests/LoggingTest.swift

@@ -16,6 +16,8 @@ import XCTest
 
 #if os(macOS) || os(iOS) || os(tvOS) || os(watchOS)
 import Darwin
+#elseif os(Windows)
+import WinSDK
 #else
 import Glibc
 #endif
@@ -769,7 +771,7 @@ class LoggingTest: XCTestCase {
 
             let size = read(readFD, readBuffer, 256)
 
-            let output = String(decoding: UnsafeRawBufferPointer(start: UnsafeRawPointer(readBuffer), count: size), as: UTF8.self)
+            let output = String(decoding: UnsafeRawBufferPointer(start: UnsafeRawPointer(readBuffer), count: numericCast(size)), as: UTF8.self)
             let messageSucceeded = output.trimmingCharacters(in: .whitespacesAndNewlines).hasSuffix(testString)
             XCTAssertTrue(messageSucceeded)
         }
@@ -806,10 +808,17 @@ class LoggingTest: XCTestCase {
 
     func withWriteReadFDsAndReadBuffer(_ body: (UnsafeMutablePointer<FILE>, CInt, UnsafeMutablePointer<Int8>) -> Void) {
         var fds: [Int32] = [-1, -1]
+        #if os(Windows)
+        fds.withUnsafeMutableBufferPointer {
+            let err = _pipe($0.baseAddress, 256, _O_BINARY)
+            XCTAssertEqual(err, 0, "_pipe failed \(err)")
+        }
+        #else
         fds.withUnsafeMutableBufferPointer { ptr in
             let err = pipe(ptr.baseAddress!)
             XCTAssertEqual(err, 0, "pipe failed \(err)")
         }
+        #endif
 
         let writeFD = fdopen(fds[1], "w")
         let writeBuffer = UnsafeMutablePointer<Int8>.allocate(capacity: 256)
@@ -822,8 +831,17 @@ class LoggingTest: XCTestCase {
         XCTAssertEqual(err, 0, "setvbuf failed \(err)")
 
         let readFD = fds[0]
+        #if os(Windows)
+        let hPipe: HANDLE = HANDLE(bitPattern: _get_osfhandle(readFD))!
+        XCTAssertFalse(hPipe == INVALID_HANDLE_VALUE)
+
+        var dwMode: DWORD = DWORD(PIPE_NOWAIT)
+        let bSucceeded = SetNamedPipeHandleState(hPipe, &dwMode, nil, nil)
+        XCTAssertTrue(bSucceeded)
+        #else
         err = fcntl(readFD, F_SETFL, fcntl(readFD, F_GETFL) | O_NONBLOCK)
         XCTAssertEqual(err, 0, "fcntl failed \(err)")
+        #endif
 
         let readBuffer = UnsafeMutablePointer<Int8>.allocate(capacity: 256)
         defer {

Tests/LoggingTests/TestLogger.swift

@@ -14,6 +14,9 @@
 import Foundation
 @testable import Logging
 import XCTest
+#if os(Windows)
+import WinSDK
+#endif
 
 internal struct TestLogging {
     private let _config = Config() // shared among loggers
@@ -299,6 +302,8 @@ public class MDC {
     private var threadId: Int {
         #if os(macOS) || os(iOS) || os(tvOS) || os(watchOS)
         return Int(pthread_mach_thread_np(pthread_self()))
+        #elseif os(Windows)
+        return Int(GetCurrentThreadId())
         #else
         return Int(pthread_self())
         #endif

scripts/generate_linux_tests.rb

@@ -94,7 +94,7 @@ def createLinuxMain(testsDirectory, allTestSubDirectories, files)
     file.write header(fileName)
     file.write "\n"
 
-    file.write "#if os(Linux) || os(FreeBSD)\n"
+    file.write "#if os(Linux) || os(FreeBSD) || os(Windows)\n"
     for testSubDirectory in allTestSubDirectories.sort { |x, y| x <=> y }
       file.write '@testable import ' + testSubDirectory + "\n"
     end