ejs-loader/__tests__/index.test.js

EJS (Underscore/LoDash Templates) loader for webpack

const requireFromString = require('require-from-string');
const ejsLoader = require('../index.js');

describe('ejsLoader', () => {
  const compileTemplate = (template, mockedLoaderContext = {}) => {
    const mergedMockedLoaderContext = {
      cacheable: null,
      ...mockedLoaderContext
    };
  
    return ejsLoader.call(mergedMockedLoaderContext, template);
  }

  it('returns template with applied parameters in CommonJS with "esModule" set to false', () => {
    const compilerOptions = {
      query: {
        esModule: false
      }
    };
    const template = '<div>Hello <%= world %>!</div>';
    const params = { world: 'World' };
    const compiled = requireFromString(compileTemplate(template, compilerOptions));
    expect(compiled(params)).toBe('<div>Hello World!</div>');
  });

  describe('ejsLoader with "esModule" feature', () => {
    const convertTemplateStringToFunction = (templateString) => {
      const removeExportDefaultString = templateString.match(/export default (.*)/s)[1];
      return new Function(`return ${removeExportDefaultString}`)();
    }
    
    it('returns template with applied parameters', () => {
      const template = '<div>Hello <%= args.world %>!</div>';
      const params = { 
        world: 'World'
      };
      const compilerOptions = {
        query: {
          variable: 'args'
        }
      };
      const compiled = convertTemplateStringToFunction(compileTemplate(template, compilerOptions));
      expect(compiled(params)).toBe('<div>Hello World!</div>');
    });

    it('throws error when options variable or query variable are undefined', () => {
      const template = '<div>Hello <%= args.world %>!</div>';
      
      expect(() => {
        compileTemplate(template)
      }).toThrowError();
    });
  })
});