Add conformance test cases for malformed nanos fields on Durations and Timestamps.

Durations have a validity restriction on `nanos` that:
- The range allowed is (-1s..1s) exclusive
- The sign must match the sign of `secs` (for 0 secs both positive and negative values of nanos are allowed)

Timestamps have a validity restriction on `nanos` that:
- The range allowed is [0..1s)

These cases have always been commented as only being valid under these constraints, and other validity constraints are already checked to be handled as ProtoJSON serialize-failures, but this particular condition was not covered by the conformance suite.

PiperOrigin-RevId: 791194939

Author: protobuf-github-bot

conformance/binary_json_conformance_suite.cc

@@ -3128,6 +3128,18 @@ void BinaryAndJsonConformanceSuiteImpl<
       "DurationProtoInputTooLarge", REQUIRED,
       "optional_duration: {seconds: 315576000001 nanos: 0}");
 
+  ExpectSerializeFailureForJson("DurationProtoNanosWrongSign", REQUIRED,
+                                "optional_duration: {seconds: 1 nanos: -1}");
+  ExpectSerializeFailureForJson("DurationProtoNanosWrongSignNegativeSecs",
+                                REQUIRED,
+                                "optional_duration: {seconds: -1 nanos: 1}");
+  ExpectSerializeFailureForJson(
+      "DurationProtoNanosTooSmall", REQUIRED,
+      "optional_duration: {seconds: -1 nanos: -1000000000}");
+  ExpectSerializeFailureForJson(
+      "DurationProtoNanosTooLarge", REQUIRED,
+      "optional_duration: {seconds: 1 nanos: 1000000000}");
+
   RunValidJsonTestWithValidator(
       "DurationHasZeroFractionalDigit", RECOMMENDED,
       R"({"optionalDuration": "1.000000000s"})", [](const Json::Value& value) {
@@ -3220,6 +3232,12 @@ void BinaryAndJsonConformanceSuiteImpl<
                                 "optional_timestamp: {seconds: -62135596801}");
   ExpectSerializeFailureForJson("TimestampProtoInputTooLarge", REQUIRED,
                                 "optional_timestamp: {seconds: 253402300800}");
+  ExpectSerializeFailureForJson(
+      "TimestampProtoNegativeNanos", REQUIRED,
+      "optional_timestamp: {seconds: 5000 nanos: -1}");
+  ExpectSerializeFailureForJson(
+      "TimestampProtoNanoTooLarge", REQUIRED,
+      "optional_timestamp: {seconds: 5000 nanos: 1000000000}");
   RunValidJsonTestWithValidator(
       "TimestampZeroNormalized", RECOMMENDED,
       R"({"optionalTimestamp": "1969-12-31T16:00:00-08:00"})",

conformance/failure_list_cpp.txt

@@ -33,3 +33,5 @@ Recommended.*.FieldMaskNumbersDontRoundTrip.JsonOutput
 Recommended.*.FieldMaskPathsDontRoundTrip.JsonOutput                                                               # Should have failed to serialize, but didn't.
 Recommended.*.FieldMaskTooManyUnderscore.JsonOutput                                                                # Should have failed to serialize, but didn't.
 Recommended.*.JsonInput.FieldMaskInvalidCharacter                                                                  # Should have failed to parse, but didn't.
+Required.*.TimestampProtoNanoTooLarge.JsonOutput                                                                   # Should have failed to serialize, but didn't.
+Required.*.TimestampProtoNegativeNanos.JsonOutput                                                                  # Should have failed to serialize, but didn't.

conformance/failure_list_php.txt

@@ -38,3 +38,9 @@ Required.*.JsonInput.AnyWithNoType.*
 Required.*.JsonInput.TimestampWithMissingColonInOffset                                                             # Should have failed to parse, but didn't.
 Required.Editions_Proto3.JsonInput.DoubleFieldTooLarge                                                             # Should have failed to parse, but didn't.
 Required.Proto3.JsonInput.DoubleFieldTooLarge                                                                      # Should have failed to parse, but didn't.
+Required.*.DurationProtoNanosTooLarge.JsonOutput # Should have failed to serialize, but didn't.
+Required.*.DurationProtoNanosTooSmall.JsonOutput # Should have failed to serialize, but didn't.
+Required.*.DurationProtoNanosWrongSign.JsonOutput # Should have failed to serialize, but didn't.
+Required.*.DurationProtoNanosWrongSignNegativeSecs.JsonOutput # Should have failed to serialize, but didn't.
+Required.*.TimestampProtoNanoTooLarge.JsonOutput # Should have failed to serialize, but didn't.
+Required.*.TimestampProtoNegativeNanos.JsonOutput # Should have failed to serialize, but didn't.