Add JsonParser setting to ignore unknown field values

Note that the default behavior is still to throw an exception; you
need to opt into ignoring unknown fields.

Fixes #2838.

1 files changed, 16 insertions, 0 deletions

diff --git a/csharp/src/Google.Protobuf.Test/JsonTokenizerTest.cs b/csharp/src/Google.Protobuf.Test/JsonTokenizerTest.cs
index 527ab336..33d35036 100644
--- a/csharp/src/Google.Protobuf.Test/JsonTokenizerTest.cs
+++ b/csharp/src/Google.Protobuf.Test/JsonTokenizerTest.cs
@@ -349,6 +349,22 @@ namespace Google.Protobuf
             Assert.AreEqual(JsonToken.EndDocument, tokenizer.Next());
             Assert.Throws<InvalidOperationException>(() => tokenizer.Next());
         }
+
+        [Test]
+        [TestCase("{ 'skip': 0, 'next': 1")]
+        [TestCase("{ 'skip': [0, 1, 2], 'next': 1")]
+        [TestCase("{ 'skip': 'x', 'next': 1")]
+        [TestCase("{ 'skip': ['x', 'y'], 'next': 1")]
+        [TestCase("{ 'skip': {'a': 0}, 'next': 1")]
+        [TestCase("{ 'skip': {'a': [0, {'b':[]}]}, 'next': 1")]
+        public void SkipValue(string json)
+        {
+            var tokenizer = JsonTokenizer.FromTextReader(new StringReader(json.Replace('\'', '"')));
+            Assert.AreEqual(JsonToken.StartObject, tokenizer.Next());
+            Assert.AreEqual("skip", tokenizer.Next().StringValue);
+            tokenizer.SkipValue();
+            Assert.AreEqual("next", tokenizer.Next().StringValue);
+        }
        
         /// <summary>
         /// Asserts that the specified JSON is tokenized into the given sequence of tokens.