           XCTAssertEqual(jobs.count, 1)
           XCTAssertEqual(jobs.first!.tool.name, customSwiftFrontend.pathString)
         }
-      
+
         // test if current working directory is searched
         do {
           var driver = try Driver(args: ["swiftc", "-print-target-info"], env: ["PATH": ""])

    let jobs = try driver.planBuild()
    XCTAssertEqual(jobs.count, 1)
    let defaultSwiftFrontend = jobs.first!.tool.absolutePath!
    
    try withTemporaryDirectory { toolsDirectory in
      let customSwiftFrontend = toolsDirectory.appending(component: executableName("swift-frontend"))
      try localFileSystem.createSymbolicLink(customSwiftFrontend, pointingAt: defaultSwiftFrontend, relative: false)

        try localFileSystem.changeCurrentWorkingDirectory(to: tempDirectory)
        let anotherSwiftFrontend = localFileSystem.currentWorkingDirectory!.appending(component: executableName("swift-frontend"))
        try localFileSystem.createSymbolicLink(anotherSwiftFrontend, pointingAt: defaultSwiftFrontend, relative: false)

        // test if SWIFT_DRIVER_TOOLNAME_EXEC is respected
        do {
          var driver = try Driver(args: ["swiftc", "-print-target-info"], env: ["SWIFT_DRIVER_SWIFT_FRONTEND_EXEC": customSwiftFrontend.pathString, "PATH": ProcessEnv.path!])
          let jobs = try driver.planBuild()
          XCTAssertEqual(jobs.count, 1)
          XCTAssertEqual(jobs.first!.tool.name, customSwiftFrontend.pathString)
        }

        // test if tools directory is respected
        do {
