public void SubFieldCollection_ToJson1()
        {
            SubFieldCollection collection = _GetCollection();

            string actual = collection.ToJson()
                            .Replace("\r", "").Replace("\n", "");
            const string expected = @"["
                                    + @"  {"
                                    + @"    ""code"": ""a"","
                                    + @"    ""value"": ""Subfield A"""
                                    + @"  },"
                                    + @"  {"
                                    + @"    ""code"": ""b"","
                                    + @"    ""value"": ""Subfield B"""
                                    + @"  },"
                                    + @"  {"
                                    + @"    ""code"": ""c"","
                                    + @"    ""value"": ""Subfield C"""
                                    + @"  }"
                                    + @"]";

            Assert.AreEqual(expected, actual);
        }