Add JDK serializability test for ReflectionCache

Author: k163377

src/test/kotlin/com/fasterxml/jackson/module/kotlin/JDKSerializabilityTestHelper.kt

@@ -0,0 +1,28 @@
+package com.fasterxml.jackson.module.kotlin
+
+import junit.framework.TestCase
+import java.io.ByteArrayInputStream
+import java.io.ByteArrayOutputStream
+import java.io.ObjectInputStream
+import java.io.ObjectOutputStream
+
+fun jdkSerialize(o: Any): ByteArray {
+    val bytes = ByteArrayOutputStream(1000)
+    val obOut = ObjectOutputStream(bytes)
+    obOut.writeObject(o)
+    obOut.close()
+    return bytes.toByteArray()
+}
+
+fun <T> jdkDeserialize(raw: ByteArray): T? {
+    val objIn = ObjectInputStream(ByteArrayInputStream(raw))
+    return try {
+        @Suppress("UNCHECKED_CAST")
+        objIn.readObject() as T
+    } catch (e: ClassNotFoundException) {
+        TestCase.fail("Missing class: " + e.message)
+        null
+    } finally {
+        objIn.close()
+    }
+}

src/test/kotlin/com/fasterxml/jackson/module/kotlin/ReflectionCacheTest.kt

@@ -0,0 +1,30 @@
+package com.fasterxml.jackson.module.kotlin
+
+import org.junit.Test
+import kotlin.test.assertNotNull
+
+class ReflectionCacheTest {
+    @Test
+    fun serializeEmptyCache() {
+        val cache = ReflectionCache(100)
+        val serialized = jdkSerialize(cache)
+        val deserialized = jdkDeserialize<ReflectionCache>(serialized)
+
+        assertNotNull(deserialized)
+        // Deserialized instance also do not raise exceptions
+        deserialized.kotlinFromJava(ReflectionCacheTest::class.java.getDeclaredMethod("serializeEmptyCache"))
+    }
+
+    @Test
+    fun serializeNotEmptyCache() {
+        val method = ReflectionCacheTest::class.java.getDeclaredMethod("serializeNotEmptyCache")
+
+        val cache = ReflectionCache(100).apply { kotlinFromJava(method) }
+        val serialized = jdkSerialize(cache)
+        val deserialized = jdkDeserialize<ReflectionCache>(serialized)
+
+        assertNotNull(deserialized)
+        // Deserialized instance also do not raise exceptions
+        deserialized.kotlinFromJava(method)
+    }
+}