test-repo/tests/integration/__tests__/format.js

import prettier from "prettier-local";
import { outdent } from "outdent";
import fooPlugin from "../plugins/defaultOptions/plugin.cjs";

test("yaml parser should handle CRLF correctly", () => {
  const input = "a:\r\n  123\r\n";
  expect(
    // use JSON.stringify to observe CRLF
    JSON.stringify(
      prettier.format(input, { parser: "yaml", endOfLine: "auto" })
    )
  ).toMatchSnapshot();
});

test("typescript parser should throw the first error when both JSX and non-JSX mode failed", () => {
  const input = outdent`
    import React from "react";

    const App = () => (
      <div className="App">
      </div>
    );

    label:
  `;
  expect(() =>
    prettier.format(input, { parser: "typescript" })
  ).toThrowErrorMatchingSnapshot();
});

test("html parser should handle CRLF correctly", () => {
  const input = "<!--\r\n  test\r\n  test\r\n-->";
  expect(
    // use JSON.stringify to observe CRLF
    JSON.stringify(
      prettier.format(input, { parser: "html", endOfLine: "auto" })
    )
  ).toMatchSnapshot();
});

test("markdown parser should handle CRLF correctly", () => {
  const input = "```\r\n\r\n\r\n```";
  expect(
    // use JSON.stringify to observe CRLF
    JSON.stringify(
      prettier.format(input, { parser: "markdown", endOfLine: "auto" })
    )
  ).toMatchSnapshot();
});

test("should work with foo plugin instance", () => {
  const input = "a:\r\n  123\r\n";
  expect(
    JSON.stringify(
      prettier.format(input, { parser: "foo-parser", plugins: [fooPlugin] })
    )
  ).toMatchInlineSnapshot('""{\\"tabWidth\\":8,\\"bracketSpacing\\":false}""');
});

test("'Adjacent JSX' error should not be swallowed by Babel's error recovery", () => {
  const input = "<a></a>\n<b></b>";
  expect(() =>
    prettier.format(input, { parser: "babel" })
  ).toThrowErrorMatchingSnapshot();
});