add unit test for change to VirtualNodeUpgradeRequest avro schema

Signed-off-by: TomFitzpatrick <[email protected]>

data/avro-schema/src/test/kotlin/net/corda/data/virtualnode/VirtualNodeUpgradeRequestSchemaCompatibilityTest.kt

@@ -0,0 +1,47 @@
+package net.corda.data.virtualnode
+
+import org.apache.avro.Schema
+import org.apache.avro.SchemaCompatibility
+import org.junit.jupiter.api.Assertions
+import org.junit.jupiter.api.Test
+
+class VirtualNodeUpgradeRequestSchemaCompatibilityTest {
+
+    @Test
+    fun `VirtualNodeUPgradeRequest schema changes between Corda 5_0 and 5_1 are compatible`() {
+        val schemaV50Json = """
+        {
+          "type": "record",
+          "name": "VirtualNodeUpgradeRequest",
+          "namespace": "net.corda.data.virtualnode",
+          "fields": [
+            {
+              "name": "virtualNodeShortHash",
+              "type": "string",
+              "doc": "Short hash of the virtual node / holding identity."
+            },
+            {
+              "name": "cpiFileChecksum",
+              "type": "string",
+              "doc": "The checksum of the CPI file."
+            },
+            {
+              "name": "actor",
+              "type": "string",
+              "doc": "ID of RPC user that requested the virtual node creation."
+            }
+          ]
+        }
+        """.trimIndent()
+
+        val schemaV50 = Schema.Parser().parse(schemaV50Json)
+        val schemaV51 = VirtualNodeUpgradeRequest.`SCHEMA$`
+
+        val compatibility = SchemaCompatibility.checkReaderWriterCompatibility(schemaV51, schemaV50)
+        Assertions.assertEquals(
+            compatibility.type,
+            SchemaCompatibility.SchemaCompatibilityType.COMPATIBLE,
+            "Failed due to incompatible change. ${compatibility.description}"
+        )
+    }
+}