Fix tests on WASI

Author: Frizlab

Tests/JSONLoggerTests/PipeHelper.swift

@@ -0,0 +1,30 @@
+#if os(WASI)
+import Foundation
+import WASILibc
+
+
+
+typealias Pipe = FakePipe
+struct FakePipe {
+	
+	init() {
+		try! Data().write(to: fileURL)
+		assert(FileManager.default.fileExists(atPath: fileURL.absoluteURL.path), "Created file does not exist!")
+	}
+	
+	var fileHandleForWriting: FileHandle {
+		return try! FileHandle(forWritingTo: fileURL)
+	}
+	
+	var fileHandleForReading: FileHandle {
+		return try! FileHandle(forReadingFrom: fileURL)
+	}
+	
+	private let fileURL = FileManager.default.temporaryDirectory.appendingPathComponent("json-logger-test-\(UUID()).txt")
+//	private let fileURL = URL(fileURLWithPath: #filePath).deletingLastPathComponent().appendingPathComponent("json-logger-test-\(UUID()).txt")
+	private var filepath: String {
+		fileURL.absoluteURL.path
+	}
+	
+}
+#endif