Proper string comparison.

runtime/vm/object_test.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
@@ skipping 638 matching lines @@
 
     const Array& array3 = Array::Handle(Array::New(3));
     EXPECT_EQ(3, array3.Length());
     array3.SetAt(0, str2);
     array3.SetAt(1, str1);
     array3.SetAt(2, str2);
     const String& str7 = String::Handle(String::ConcatAll(array3));
     EXPECT(str7.IsOneByteString());
     EXPECT_EQ(6, str7.Length());
     EXPECT(str7.Equals("oneone"));
+    EXPECT(!str7.Equals("oneoneone"));
   }
 
   // Create a string by concatenating non-empty 1-byte strings.
   {
     const char* one = "one";
     intptr_t one_len = strlen(one);
     const String& onestr = String::Handle(String::New(one));
     EXPECT(onestr.IsOneByteString());
     EXPECT_EQ(one_len, onestr.Length());
 
@@ skipping 1280 matching lines @@
     cls = iterator.GetNextClass();
     ASSERT((cls.raw() == ae66.raw()) || (cls.raw() == re44.raw()));
     count++;
   }
   ASSERT(count == 2);
 }
 
 #endif  // TARGET_ARCH_IA32.
 
 }  // namespace dart