Strings recipes for the Dart Cookbook

recipes/test/core/strings/determining_if_string_contains_test.dart

Index: recipes/test/core/strings/determining_if_string_contains_test.dart
diff --git a/recipes/test/core/strings/determining_if_string_contains_test.dart b/recipes/test/core/strings/determining_if_string_contains_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..5b8e82f18c1af78b981f1ef3418423c455f50e97
--- /dev/null
+++ b/recipes/test/core/strings/determining_if_string_contains_test.dart
@@ -0,0 +1,32 @@
+library determining_if_string_contains_test;
+
+import 'package:unittest/unittest.dart';
+
+void main() {
+  
+  group('determining whether a string contains a substring', () {
+    var string = 'Dart strings are immutable';
+    
+    test('using contains', () {
+      expect(string.contains('immutable'), isTrue);
+      expect(string.contains('Dart', 2), isFalse);
+    });
+    
+    test('using startsWith()', () {
+      expect(string.startsWith('Dart'), isTrue);
+    });
+    
+    test('using endsWith()', () {
+      assert(string.endsWith('e') == true);
+    });
+    
+    test('using indexOf()', () {
+      expect(string.indexOf('art') != -1, isTrue);
+    });
+    
+    test('using hasMatch()', () {
+      expect(new RegExp(r'ar[et]').hasMatch(string), isTrue);
+    });
+  });
+
+}