Strings recipes for the Dart Cookbook

recipes/test/core/strings/determining_if_string_is_empty_test.dart

Index: recipes/test/core/strings/determining_if_string_is_empty_test.dart
diff --git a/recipes/test/core/strings/determining_if_string_is_empty_test.dart b/recipes/test/core/strings/determining_if_string_is_empty_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..199655bbeabcf030b067e50dcb60528e9606a2c9
--- /dev/null
+++ b/recipes/test/core/strings/determining_if_string_is_empty_test.dart
@@ -0,0 +1,23 @@
+library determining_if_string_is_empty_test;
+
+import 'package:unittest/unittest.dart';
+
+void main() {
+  group('determining if string is empty', () {
+    var emptyString = '';
+    var space = ' ';
+    
+    test('', () {
+      expect(emptyString.isEmpty, isTrue);
+    });
+    
+    test('if string contains a space', () {
+      expect(space.isEmpty, isFalse);
+    });
+    
+    test('by checking for equality', () {
+      expect('' == 'u\2004', isFalse);
+    });
+  });  
+}
+