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x/indexer/indexer_test.ts

🦕 The indexer library is a Deno module that provides a class called Indexer, which generates index numbers.
lambdalisue/deno-indexer
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import { assertEquals, assertThrows } from "@std/assert";import { Indexer } from "./indexer.ts";import { InvalidMaxError } from "./errors.ts";
Deno.test("Indexer without 'max' works as expect", () => {  const indexer = new Indexer();  assertEquals(indexer.next(), 0);  assertEquals(indexer.next(), 1);  assertEquals(indexer.next(), 2);});
Deno.test("Indexer with 'max' works as expect", () => {  const indexer = new Indexer(3);  assertEquals(indexer.next(), 0);  assertEquals(indexer.next(), 1);  assertEquals(indexer.next(), 2);  assertEquals(indexer.next(), 3);  assertEquals(indexer.next(), 0);});
Deno.test("Indexer with 'max' smaller than 2 throws error", () => {  assertThrows(() => new Indexer(1), InvalidMaxError);});