import {
  assertEquals,
  assertThrows,
} from "https://deno.land/std/testing/asserts.ts";
import { isinstance, nn, nnu, nu } from "./typing.ts";

Deno.test("isinstance", () => {
  class A {}
  class A1 extends A {}
  class A2 extends A {}
  class B {}

  const f: any[] = [5, null, undefined, new A(), new A1(), new B(), new A2()];
  const result = f.filter(isinstance(A));
  assertEquals(result, [f[3], f[4], f[6]]);
});

Deno.test("nn", () => {
  assertEquals(nn(undefined), undefined);
  assertEquals(nn(0), 0);
  assertEquals(nn(""), "");
  assertEquals(nn([]), []);
  assertThrows(() => nn(null), Error, "null value");
});

Deno.test("nu", () => {
  assertEquals(nu(null), null);
  assertEquals(nu(0), 0);
  assertEquals(nu(""), "");
  assertEquals(nu([]), []);
  assertThrows(() => nu(undefined), Error, "undefined value");
});

Deno.test("nnu", () => {
  assertEquals(nnu(0), 0);
  assertEquals(nnu(""), "");
  assertEquals(nnu([]), []);
  assertThrows(() => nnu(undefined), Error, "undefined value");
  assertThrows(() => nnu(null), Error, "null value");
});