rushstack/apps/api-documenter/src/utils/test/IndentedWriter.test.ts at master · JavaScriptExpert/rushstack · GitHub

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// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
// See LICENSE in the project root for license information.

import { IndentedWriter } from '../IndentedWriter';

test('01 Demo from docs', () => {
  const indentedWriter: IndentedWriter = new IndentedWriter();
  indentedWriter.write('begin\n');
  indentedWriter.increaseIndent();
  indentedWriter.write('one\ntwo\n');
  indentedWriter.decreaseIndent();
  indentedWriter.increaseIndent();
  indentedWriter.decreaseIndent();
  indentedWriter.write('end');

  expect(indentedWriter.toString()).toMatchSnapshot();
});

test('02 Indent something', () => {
  const indentedWriter: IndentedWriter = new IndentedWriter();
  indentedWriter.write('a');
  indentedWriter.write('b');
  indentedWriter.increaseIndent();
    indentedWriter.writeLine('c');
    indentedWriter.writeLine('d');
  indentedWriter.decreaseIndent();
  indentedWriter.writeLine('e');

  indentedWriter.increaseIndent('>>> ');
    indentedWriter.writeLine();
    indentedWriter.writeLine();
    indentedWriter.writeLine('g');
  indentedWriter.decreaseIndent();

  expect(indentedWriter.toString()).toMatchSnapshot();
});

test('03 Two kinds of indents', () => {
  const indentedWriter: IndentedWriter = new IndentedWriter();

  indentedWriter.writeLine('---');
  indentedWriter.indentScope(() => {
    indentedWriter.write('a\nb');
    indentedWriter.indentScope(() => {
      indentedWriter.write('c\nd\n');
    });
    indentedWriter.write('e\n');
  }, '> ');
  indentedWriter.writeLine('---');

  expect(indentedWriter.toString()).toMatchSnapshot();
});

test('04 Edge cases for ensureNewLine()', () => {
  let indentedWriter: IndentedWriter = new IndentedWriter();
  indentedWriter.ensureNewLine();
  indentedWriter.write('line');
  expect(indentedWriter.toString()).toMatchSnapshot();

  indentedWriter = new IndentedWriter();
  indentedWriter.write('previous');
  indentedWriter.ensureNewLine();
  indentedWriter.write('line');
  expect(indentedWriter.toString()).toMatchSnapshot();
});

test('04 Edge cases for ensureSkippedLine()', () => {
  let indentedWriter: IndentedWriter = new IndentedWriter();
  indentedWriter.ensureSkippedLine();
  indentedWriter.write('line');
  expect(indentedWriter.toString()).toMatchSnapshot();

  indentedWriter = new IndentedWriter();
  indentedWriter.write('previous');
  indentedWriter.ensureSkippedLine();
  indentedWriter.write('line');
  expect(indentedWriter.toString()).toMatchSnapshot();
});