@ngx-translate/core/tests/translate.parser.spec.ts

import {TranslateDefaultParser, TranslateParser} from '../public-api';

describe('Parser', () => {
  let parser: TranslateParser;

  beforeEach(() => {
    parser = new TranslateDefaultParser();
  });

  it('is defined', () => {
    expect(TranslateParser).toBeDefined();

    expect(parser instanceof TranslateParser).toBeTruthy();
  });

  it('should interpolate strings', () => {
    expect(parser.interpolate("This is a {{ key }}", {key: "value"})).toEqual("This is a value");
  });

  it('should interpolate strings with falsy values', () => {
    expect(parser.interpolate("This is a {{ key }}", {key: ""})).toEqual("This is a ");
    expect(parser.interpolate("This is a {{ key }}", {key: 0})).toEqual("This is a 0");
  });

  it('should interpolate strings with object properties', () => {
    expect(parser.interpolate("This is a {{ key1.key2 }}", {key1: {key2: "value2"}})).toEqual("This is a value2");
    expect(parser.interpolate("This is a {{ key1.key2.key3 }}", {key1: {key2: {key3: "value3"}}})).toEqual("This is a value3");
  });

  it('should support interpolation functions', () => {
    expect(parser.interpolate((v: string) => v.toUpperCase() + ' YOU!', 'bless')).toBe('BLESS YOU!');
  });

  it('should get the addressed value', () => {
    expect(parser.getValue({key1: {key2: "value2"}}, 'key1.key2')).toEqual("value2");
    expect(parser.getValue({key1: {key2: "value"}}, 'keyWrong.key2')).not.toBeDefined();
    expect(parser.getValue({key1: {key2: {key3: "value3"}}}, 'key1.key2.key3')).toEqual("value3");
    expect(parser.getValue({key1: {key2: {key3: "value3"}}}, 'key1.keyWrong.key3')).not.toBeDefined();
    expect(parser.getValue({key1: {key2: {key3: "value3"}}}, 'key1.key2.keyWrong')).not.toBeDefined();


    expect(parser.getValue({'key1.key2': {key3: "value3"}}, 'key1.key2.key3')).toEqual("value3");
    expect(parser.getValue({key1: {'key2.key3': "value3"}}, 'key1.key2.key3')).toEqual("value3");
    expect(parser.getValue({'key1.key2.key3': "value3"}, 'key1.key2.key3')).toEqual("value3");
    expect(parser.getValue({'key1.key2': {key3: "value3"}}, 'key1.key2.keyWrong')).not.toBeDefined();
    expect(parser.getValue({
      'key1': "value1",
      'key1.key2': "value2"
    }, 'key1.key2')).toEqual("value2");

  });
});