Strings recipes for the Dart Cookbook

recipes/test/core/strings/incrementally_building_test.dart

+library incrementally_building;
+
+import 'package:unittest/unittest.dart';
+
+void main() {
+  group('incrementally building a string using a StringBuffer', () {
+    test('using write()', () {
+      var sb = new StringBuffer();
+      sb.write('John, ');
+      sb.write('Paul, ');
+      sb.write('George, ');
+      sb.write('and Ringo');
+      expect(sb.toString(), equals('John, Paul, George, and Ringo'));
+    });
+    
+    test('using several methods', () {
+      var sb = new StringBuffer();
+      sb.writeln('The Beatles:');
+      sb.writeAll(['John, ', 'Paul, ', 'George, and Ringo']);
+      sb.writeCharCode(33); // charCode for '!'.
+      expect(sb.toString(), equals('The Beatles:\nJohn, Paul, George, and Ringo!'));
+    });
+  });
+}