Added test to deserialise 4.11 network params

serialization/src/test/kotlin/net/corda/serialization/internal/amqp/EvolvabilityTests.kt

@@ -637,6 +637,45 @@ class EvolvabilityTests {
         assertEquals(DUMMY_NOTARY_PARTY, networkParams.notaries.firstOrNull()?.identity)
     }
 
+    //
+    // This test uses a NetworkParameters signed set of bytes generated by a Corda 4.11 build and
+    // is here to ensure we can still read them. This test exists because Corda 4.11 Adds in new
+    // network parameters that should be backwards compatible with older corda versions
+    //
+    // The file itself was generated from a corda-os 4.11 build at commit
+    //      58ecce1 Ent-9875: New Network Parameters
+    //
+    // To regenerate the file un-ignore the test below this one (regenerate broken network parameters),
+    // to regenerate at a specific version add that test to a checkout at the desired sha then take
+    // the resulting file and add to the repo, changing the filename as appropriate
+    //
+    @Test(timeout=300_000)
+    fun `read corda 4-11 network parameters`() {
+        val sf = testDefaultFactory()
+        sf.register(net.corda.serialization.internal.amqp.custom.InstantSerializer(sf))
+        sf.register(net.corda.serialization.internal.amqp.custom.PublicKeySerializer)
+        sf.register(net.corda.serialization.internal.amqp.custom.DurationSerializer(sf))
+
+        //
+        // filename breakdown
+        // networkParams - because this is a serialised set of network parameters
+        // r3corda - generated by Corda Enterprise instead of Corda
+        // 6a6b6f256 - Commit sha of the build that generated the file we're testing against
+        //
+        val resource = "networkParams.4.11.58ecce1"
+
+        val url = EvolvabilityTests::class.java.getResource(resource)
+        val sc2 = url.readBytes()
+        val deserializedC = DeserializationInput(sf).deserialize(SerializedBytes<SignedData<NetworkParameters>>(sc2))
+        val networkParams = DeserializationInput(sf).deserialize(deserializedC.raw)
+
+        assertEquals(1000, networkParams.maxMessageSize)
+        assertEquals(1000, networkParams.maxTransactionSize)
+        assertEquals(3, networkParams.minimumPlatformVersion)
+        assertEquals(1, networkParams.notaries.size)
+        assertEquals(DUMMY_NOTARY_PARTY, networkParams.notaries.firstOrNull()?.identity)
+    }
+
     //
     // This test created a serialized and signed set of Network Parameters to test whether we
     // can still deserialize them