add test for CaseObjectDeserializerTest

Author: pjfanning

src/test/scala/tools/jackson/module/scala/deser/CaseObjectDeserializerTest.scala

@@ -2,6 +2,7 @@ package tools.jackson.module.scala.deser
 
 import CaseObjectDeserializerTest.{Foo, TestObject}
 import com.fasterxml.jackson.annotation.JsonAutoDetect
+import tools.jackson.databind.DeserializationFeature
 import tools.jackson.databind.introspect.VisibilityChecker
 import tools.jackson.databind.json.JsonMapper
 import tools.jackson.module.scala.{ClassTagExtensions, DefaultScalaModule}
@@ -29,6 +30,17 @@ class CaseObjectDeserializerTest extends DeserializerTest {
     assert(deserialized === original)
   }
 
+  it should "deserialize a case object and not create a new instance (FAIL_ON_TRAILING_TOKENS disabled)" in {
+    val mapper = newBuilder
+      .disable(DeserializationFeature.FAIL_ON_TRAILING_TOKENS)
+      .build()
+    val original = TestObject
+    val json = mapper.writeValueAsString(original)
+    json shouldEqual "{}"
+    val deserialized = mapper.readValue(json, TestObject.getClass)
+    assert(deserialized === original)
+  }
+
   it should "deserialize Foo and not create a new instance" in {
     val mapper = newMapper
     val original = Foo