Strings recipes for the Dart Cookbook

recipes/test/core/strings/incrementally_building_test.dart

Index: recipes/test/core/strings/incrementally_building_test.dart
diff --git a/recipes/test/core/strings/incrementally_building_test.dart b/recipes/test/core/strings/incrementally_building_test.dart
new file mode 100644
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+++ b/recipes/test/core/strings/incrementally_building_test.dart
@@ -0,0 +1,24 @@
+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!'));
+    });
+  });
+}