xref: /expo/apps/test-suite/tests/Localization.js (revision 8f4be4e2) 
1import * as Localization from 'expo-localization';
2import i18n from 'i18n-js';
3import { Platform } from 'react-native';
4
5const en = {
6  good: 'good',
7  morning: 'morning',
8};
9
10const fr = {
11  good: 'bien',
12  morning: 'matin',
13};
14
15const pl = {
16  good: 'dobry',
17  morning: 'rano',
18};
19
20export const name = 'Localization';
21
22export function test(t) {
23  t.describe(`Localization methods`, () => {
24    t.it('expect async to return locale', async () => {
25      function validateString(result) {
26        t.expect(result).toBeDefined();
27        t.expect(typeof result).toBe('string');
28        t.expect(result.length > 0).toBe(true);
29      }
30
31      function validateStringArray(result) {
32        t.expect(result).toBeDefined();
33        t.expect(Array.isArray(result)).toBe(true);
34      }
35
36      const {
37        locale,
38        locales,
39        timezone,
40        isoCurrencyCodes,
41        country,
42        isRTL,
43      } = await Localization.getLocalizationAsync();
44
45      validateString(locale);
46      validateString(timezone);
47      validateString(country);
48
49      validateStringArray(isoCurrencyCodes);
50      validateStringArray(locales);
51      t.expect(locales[0]).toBe(Localization.locale);
52      t.expect(typeof isRTL).toBe('boolean');
53    });
54  });
55
56  t.describe(`Localization defines constants`, () => {
57    t.it('Gets the current device country', async () => {
58      const result = Localization.country;
59
60      t.expect(result).toBeDefined();
61      t.expect(typeof result).toBe('string');
62      t.expect(result.length > 0).toBe(true);
63    });
64    t.it('Gets the current locale', async () => {
65      const result = Localization.locale;
66
67      t.expect(result).toBeDefined();
68      t.expect(typeof result).toBe('string');
69      t.expect(result.length > 0).toBe(true);
70    });
71    t.it('Gets the preferred locales', async () => {
72      const result = Localization.locales;
73
74      t.expect(result).toBeDefined();
75      t.expect(Array.isArray(result)).toBe(true);
76      t.expect(result.length > 0).toBe(true);
77      t.expect(result[0]).toBe(Localization.locale);
78    });
79    t.it('Gets ISO currency codes', async () => {
80      const result = Localization.isoCurrencyCodes;
81      t.expect(result).toBeDefined();
82      t.expect(Array.isArray(result)).toBe(true);
83      for (let iso of result) {
84        t.expect(typeof iso).toBe('string');
85        t.expect(iso.length > 0).toBe(true);
86      }
87    });
88    if (Platform.OS !== 'web') {
89      t.it('Gets the current timezone', async () => {
90        const result = Localization.timezone;
91        t.expect(result).toBeDefined();
92        t.expect(typeof result).toBe('string');
93        t.expect(result.length > 0).toBe(true);
94        // Format: expect something like America/Los_Angeles or America/Chihuahua
95        t.expect(result.split('/').length > 1).toBe(true);
96      });
97    }
98
99    t.it('Gets the current layout direction (ltr only)', async () => {
100      const result = Localization.isRTL;
101      t.expect(result).toBeDefined();
102      t.expect(result).toBe(false);
103    });
104  });
105
106  t.describe(`Localization works with i18n-js`, () => {
107    i18n.locale = Localization.locale;
108    i18n.translations = { en, fr, pl };
109    i18n.missingTranslationPrefix = 'EE: ';
110    i18n.fallbacks = true;
111
112    t.it('expect language to match strings (en, pl, fr supported)', async () => {
113      const target = 'good';
114
115      i18n.locale = Localization.locale;
116
117      const expoPredictedLangTag = Localization.locale.split('-')[0];
118      const translation = i18n.translations[expoPredictedLangTag];
119
120      t.expect(translation[target]).toBe(i18n.t(target));
121    });
122  });
123}
124