multiconf/tests/template.test.js

Work with JSON configs

const assert = require('node:assert');
const test = require('node:test');

const Template = require('../lib/template');

test.describe('Template', () => {
  test.it('renders plain text without tags', () => {
    const template = new Template();

    assert.strictEqual(template.renderString('hello world'), 'hello world');
  });

  test.it('renders escaped interpolations from context', () => {
    const template = new Template();

    assert.strictEqual(
      template.renderString('Hello, <%= name %>!', { name: '<Ada & Bob>' }),
      'Hello, &lt;Ada &amp; Bob&gt;!',
    );
  });

  test.it('renders raw interpolations without escaping', () => {
    const template = new Template();

    assert.strictEqual(
      template.renderString('Value: <%- html %>', { html: '<strong>ok</strong>' }),
      'Value: <strong>ok</strong>',
    );
  });

  test.it('supports execution blocks', () => {
    const template = new Template();

    assert.strictEqual(
      template.renderString('<% const total = left + right; %><%= total %>', {
        left: 3,
        right: 4,
      }),
      '7',
    );
  });

  test.it('throws for unclosed tags', () => {
    const template = new Template();

    assert.throws(
      () => template.renderString('Hello, <%= name!'),
      {
        name: 'Error',
        message: 'Unclosed template tag.',
      },
    );
  });

  test.it('throws for invalid template expressions', () => {
    const template = new Template();

    assert.throws(
      () => template.renderString('<%= missing( %>'),
      {
        name: 'SyntaxError',
      },
    );
  });

  test.it('throws for invalid execution blocks', () => {
    const template = new Template();

    assert.throws(
      () => template.renderString('<% const value = %>'),
      {
        name: 'SyntaxError',
      },
    );
  });
});