Folder+NetworkTests.swift

func testDeleteFolder() {
    attempt {
        let session = Session.nas
        var response: JSONObject?

        stub(session, "delete-folder") { expectation in
            try! Folder.deleteFolder(session, folderID: "10396915")
                .startWithCompletedExpectation(expectation) { value in
                    response = value
                }
        }

        XCTAssertNotNil(response, "it should get a successful response")
    }
}

FolderAPITests.swift

func testDeleteFolder() {
    attempt {
        let session = Session.art
        let request = try! FileNodeAPI.deleteFolder(session, folderID: "1")
        XCTAssertEqual("/api/v1/folders/1", request.URL?.relativePath, "url matches")
        XCTAssertEqual("DELETE", request.HTTPMethod, "it is a DELETE request")
    }
}

FolderTests.swift

func testNewFolder() {
    attempt {
        let session = Session.nas
        let context = try session.filesManagedObjectContext()

        assertDifference({ Folder.count(inContext: context) }, 1) {
            self.stub(session, "add-folder") { expectation in
                Folder.newFolder(session, folderID: "10119415", name: "Folder")
                    .startWithCompletedExpectation(expectation) { _ in }
        }

        guard let folder = try? Folder.findOne(withValue: "10119415", forKey: "parentFolderID", inContext: context) else {
            XCTFail("Expected a folder")
            return
        }

        XCTAssertEqual("Folder 7", folder.name)
    }
}