         write(trivialManifest) { path in
             measure {
                 for _ in 0..<N {
-                    let manifest = try! self.manifestLoader.loadFile(path: path, baseURL: AbsolutePath.root.asString, version: nil)
+                    let manifest = try! self.manifestLoader.load(packagePath: path, baseURL: "/", version: nil)
                     XCTAssertEqual(manifest.name, "Trivial")
                 }
             }

        mktmpdir { path in
            let manifestFile = path.appending(component: "Package.swift")
            try localFileSystem.writeFileContents(manifestFile, bytes: bytes)
            body(manifestFile)
        }
    }


        write(manifest) { path in
            measure {
                for _ in 0..<N {
                    let manifest = try! self.manifestLoader.load(packagePath: path, baseURL: "/", version: nil)
                    XCTAssertEqual(manifest.name, "Foo")
                }
            }
