Basic test for KI

Author: dinomite

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

@@ -0,0 +1,37 @@
+package com.fasterxml.jackson.module.kotlin
+
+import com.fasterxml.jackson.databind.deser.std.StdValueInstantiator
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class KotlinInstantiatorsTest {
+    private val mapper = jacksonObjectMapper()
+
+    private val kotlinInstantiators = KotlinInstantiators(
+        ReflectionCache(10),
+        nullToEmptyCollection = false,
+        nullToEmptyMap = false,
+        nullIsSameAsDefault = false,
+        strictNullChecks = false
+    )
+
+    private class DefaultClass
+
+    private val deserConfig = mapper.deserializationConfig
+    private val beanDescription = deserConfig.introspect(mapper.constructType(String::class.java))
+    private val defaultInstantiator = object : StdValueInstantiator(
+        deserConfig,
+        mapper.constructType(DefaultClass::class.java)
+    ) {}
+
+    @Test
+    fun `Provides default instantiator for Java class`() {
+        val instantiator = kotlinInstantiators.findValueInstantiator(
+            deserConfig,
+            beanDescription,
+            defaultInstantiator
+        )
+
+        assertEquals(defaultInstantiator, instantiator)
+    }
+}