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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { assertEquals, assertRejects } from "../../testing/asserts.ts";import { readableStreamFromIterable } from "../../streams/conversion.ts";import { JsonStringifyStream, StringifyStreamOptions } from "./_stringify.ts";
async function assertValidStringify(  transformer: typeof JsonStringifyStream,  chunks: unknown[],  expect: string[],  options?: StringifyStreamOptions,) {  const r = readableStreamFromIterable(chunks);  const res = [];  for await (const data of r.pipeThrough(new transformer(options))) {    res.push(data);  }  assertEquals(res, expect);}
async function assertInvalidStringify(  transformer: typeof JsonStringifyStream,  chunks: unknown[],  options: StringifyStreamOptions,  // deno-lint-ignore no-explicit-any  ErrorClass: new (...args: any[]) => Error,  msgIncludes: string | undefined,) {  const r = readableStreamFromIterable(chunks);  await assertRejects(    async () => {      for await (const _ of r.pipeThrough(new transformer(options)));    },    ErrorClass,    msgIncludes,  );}
Deno.test({  name: "[encoding/json/stream] JsonStringifyStream",  async fn() {    await assertValidStringify(      JsonStringifyStream,      [{ foo: "bar" }, { foo: "bar" }],      ['{"foo":"bar"}\n', '{"foo":"bar"}\n'],    );  },});
Deno.test({  name: "[encoding/json/stream] JsonStringifyStream: throws",  async fn() {    const cyclic: Record<string, unknown> = {};    cyclic.cyclic = cyclic;    await assertInvalidStringify(      JsonStringifyStream,      [cyclic],      {},      TypeError,      "Converting circular structure to JSON",    );  },});
Deno.test({  name: "[encoding/json/stream] JsonStringifyStream: prefix and suffix",  async fn() {    await assertValidStringify(      JsonStringifyStream,      [{ foo: "bar" }, { foo: "bar" }],      [        '[[prefix]]{"foo":"bar"}[[suffix]]',        '[[prefix]]{"foo":"bar"}[[suffix]]',      ],      { prefix: "[[prefix]]", suffix: "[[suffix]]" },    );  },});