feat: Adding features and test. #96

lib/quotesy.dart

@@ -5,6 +5,7 @@ library quotesy;
 
 import 'dart:convert';
 import 'dart:io';
+import 'dart:math';
 
 class QuoteInfo {
   final String author;
@@ -21,10 +22,34 @@ class QuoteInfo {
 }
 
 class Quotes {
-  static Future<List<QuoteInfo>> loadQuotes() async {
+  static Future<List<QuoteInfo>> _quotesList() async {
     String jsonString = await File('quotes.json').readAsString();
     List<dynamic> jsonList = json.decode(jsonString);
     List<QuoteInfo> quotes = jsonList.map((json) => QuoteInfo.fromJson(json)).toList();
     return quotes;
   }
+
+  static list() async {
+    return await _quotesList();
+  }
+
+  static Future<QuoteInfo> random() async {
+    final random = Random();
+    final list = await _quotesList();
+
+    return list[random.nextInt(list.length)];
+  }
+
+  static Future<List<QuoteInfo>> byAuthor(String author) async {
+    final list = await _quotesList();
+    return list.where((quote) => quote.author == author).toList();
+  }
+
+  static Future<QuoteInfo> singleRandomByAuthor(String author) async {
+    final list = await _quotesList();
+    final listByAuthor = list.where((quote) => quote.author == author).toList();
+    final random = Random();
+
+    return listByAuthor[random.nextInt(listByAuthor.length)];
+  }
 }

test/quotesy_test.dart

@@ -3,9 +3,25 @@ import 'package:test/test.dart';
 
 void main() {
   group('A group of tests', () {
-    test('Fetching first element from quotes list', () async {
-      final quotesArray = await Quotes.loadQuotes();
+    test('Fetching quotes list', () async {
+      final quotesArray = await Quotes.list();
+      expect(quotesArray.length, greaterThan(0));
       expect(quotesArray.first.author, "Abraham Lincoln");
     });
+
+    test('Fetching random element', () async {
+      final randomQuote = await Quotes.random();
+      expect(randomQuote, isNotNull);
+    });
+
+    test('Fetching by author', () async {
+      final quoteList = await Quotes.byAuthor("Abraham Lincoln");
+      expect(quoteList.length, greaterThan(0));
+    });
+
+    test('Fetching random quote by author', () async {
+      final quoteList = await Quotes.singleRandomByAuthor("Abraham Lincoln");
+      expect(quoteList.author, "Abraham Lincoln");
+    });
   });
 }