Simple testing tool for Nest.
import NestTest
// Create a test client with our Nest application "hello"
let client = TestClient(hello)
let response = client.get("/")
assert(response.body == "Hello World")
let response = client.post("/", body: "Kyle")
assert(response.body == "Hello Kyle")
try expect(client.get("/").body) == "Hello World"
XCTAssertEqual(client.get("/").body, "Hello World")