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diff --git a/packages/gitbook/src/parse/__tests__/parseBook.js b/packages/gitbook/src/parse/__tests__/parseBook.js
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+++ b/packages/gitbook/src/parse/__tests__/parseBook.js
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+const Book = require('../../models/book');
+const createMockFS = require('../../fs/mock');
+
+describe('parseBook', function() {
+    const parseBook = require('../parseBook');
+
+    it('should parse multilingual book', function() {
+        const fs = createMockFS({
+            'LANGS.md': '# Languages\n\n* [en](en)\n* [fr](fr)',
+            'en': {
+                'README.md': 'Hello'
+            },
+            'fr': {
+                'README.md': 'Bonjour'
+            }
+        });
+        const book = Book.createForFS(fs);
+
+        return parseBook(book)
+        .then(function(resultBook) {
+            const languages = resultBook.getLanguages();
+            const books = resultBook.getBooks();
+
+            expect(resultBook.isMultilingual()).toBe(true);
+            expect(languages.getList().size).toBe(2);
+            expect(books.size).toBe(2);
+        });
+    });
+
+    it('should extend configuration for multilingual book', function() {
+        const fs = createMockFS({
+            'LANGS.md': '# Languages\n\n* [en](en)\n* [fr](fr)',
+            'book.json': '{ "title": "Test", "author": "GitBook" }',
+            'en': {
+                'README.md': 'Hello',
+                'book.json': '{ "title": "Test EN" }'
+            },
+            'fr': {
+                'README.md': 'Bonjour'
+            }
+        });
+        const book = Book.createForFS(fs);
+
+        return parseBook(book)
+        .then(function(resultBook) {
+            const books = resultBook.getBooks();
+
+            expect(resultBook.isMultilingual()).toBe(true);
+            expect(books.size).toBe(2);
+
+            const en = books.get('en');
+            const fr = books.get('fr');
+
+            const enConfig = en.getConfig();
+            const frConfig = fr.getConfig();
+
+            expect(enConfig.getValue('title')).toBe('Test EN');
+            expect(enConfig.getValue('author')).toBe('GitBook');
+
+            expect(frConfig.getValue('title')).toBe('Test');
+            expect(frConfig.getValue('author')).toBe('GitBook');
+        });
+    });
+
+    it('should parse book in a directory', function() {
+        const fs = createMockFS({
+            'book.json': JSON.stringify({
+                root: './test'
+            }),
+            'test': {
+                'README.md': 'Hello World',
+                'SUMMARY.md': '# Summary\n\n* [Page](page.md)\n',
+                'page.md': 'Page'
+            }
+        });
+        const book = Book.createForFS(fs);
+
+        return parseBook(book)
+        .then(function(resultBook) {
+            const readme = resultBook.getReadme();
+            const summary = resultBook.getSummary();
+            const articles = summary.getArticlesAsList();
+
+            expect(summary.getFile().exists()).toBe(true);
+            expect(readme.getFile().exists()).toBe(true);
+            expect(articles.size).toBe(2);
+        });
+    });
+
+});