1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889
// Copyright 2020 Daniel Araujo. All rights reserved. MIT license.import { assertStrictEquals } from "https://deno.land/std@0.77.0/testing/asserts.ts";import { readLines } from "https://deno.land/std@0.77.0/io/bufio.ts";
/** Extracts main code block from readme file. */async function naiveCodeExtraction(file: Deno.File) {  let started = false;  let collected = [];
  for await (let line of readLines(file)) {    if (line === '```js') {      started = true;      continue;    } else if (line === '```') {      started = false;      break;    }
    if (started) {      collected.push(line);    }  }
  return collected.join('\n');}
/** Runs piece of code through deno. */async function runCode(code: string) {  let tmpPath = Deno.makeTempFileSync();  try {    const encoder = new TextEncoder();    const decoder = new TextDecoder();
    const data = encoder.encode(code);    Deno.writeFileSync(tmpPath, data);
    let program = await Deno.run({      cmd: [Deno.execPath(), 'run', tmpPath],      stdout: 'piped',    });
    try {      if (!program.stdout) {        throw new Error('Expected stdout.');      }
      try {        return decoder.decode(await Deno.readAll(program.stdout));      } finally {        program.stdout.close();      }    } finally {      program.close();    }  } finally {    Deno.removeSync(tmpPath);  }}
/** Replaces imports to remote code with imports to local code. */function naiveUseLocalCode(code: String) {  let dir = new URL('.', import.meta.url).pathname;  return code.replace(/https:\/\/deno.land\/x\/rsync_parser@.+\/mod.ts/, dir + './mod.ts');}
Deno.test("main example produces expected output", async () => {  let expectedOutput = `Created src/Created src/index.jsUpdated LICENSEUpdated package.jsonDeleted package-lock.json`;
  let readme = Deno.openSync('./README.md');
  try {    let code = await naiveCodeExtraction(readme);
    // The example uses remote URL. Here we want to test against local changes.    code = naiveUseLocalCode(code);
    let output = await runCode(code);
    assertStrictEquals(output, expectedOutput);  } finally {    readme.close();  }});