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..ffe7a23d9b14952158e57383f99f2c1e00b87347
--- /dev/null
+++ b/recipes/test/core/strings/determining_if_string_is_empty_test.dart
@@ -0,0 +1,22 @@
+library determining_if_string_is_empty_test;
+
+import 'package:unittest/unittest.dart';
+
+void main() {
+  group('determining if string is empty', () {
+    test('using isEmpty', () {
+      expect(''.isEmpty, isTrue);
+    });
+    
+    test('using ==', () {
+      var string = "asdf";
+      expect(string == "", equals(false));
+    });
+   
+    test('if string contains a space', () {
+      var space = ' ';
+      expect(space.isEmpty, isFalse);
+    });
+  });  
+}
+