add tests

Author: pjfanning

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

@@ -5,6 +5,7 @@ import tools.jackson.databind.annotation.JsonDeserialize
 import tools.jackson.databind.json.JsonMapper
 import tools.jackson.databind.{DatabindException, ObjectMapper, ObjectReader, PropertyNamingStrategies}
 import tools.jackson.module.scala.DefaultScalaModule
+import tools.jackson.module.scala.ser.{ClassWithOnlyUnitField, ClassWithUnitField}
 
 import java.time.LocalDateTime
 
@@ -162,4 +163,17 @@ class CaseClassDeserializerTest extends DeserializerTest {
     val result = deserialize("""{"value":"AQID"}""", classOf[ArrayHolder])
     result.value should equal (Array[Byte](1,2,3))
   }
+
+  it should "support ClassWithUnitField" in {
+    val input = """{"intField":2}"""
+    val result = deserialize(input, classOf[ClassWithUnitField])
+    result shouldEqual ClassWithUnitField((), 2)
+  }
+
+  //this does not currently work
+  it should "support ClassWithOnlyUnitField" ignore {
+    val input = """{}"""
+    val result = deserialize(input, classOf[ClassWithOnlyUnitField])
+    result shouldEqual ClassWithOnlyUnitField(())
+  }
 }

src/test/scala/tools/jackson/module/scala/ser/CaseClassSerializerTest.scala

@@ -61,6 +61,9 @@ case class PrivateDefaultFields(
   @JsonProperty lastName: String = "Freeman"
 )
 
+case class ClassWithUnitField(field: Unit, intField: Int)
+case class ClassWithOnlyUnitField(field: Unit)
+
 class CaseClassSerializerTest extends SerializerTest {
 
   case class NestedClass(field: String)
@@ -193,4 +196,12 @@ class CaseClassSerializerTest extends SerializerTest {
     val foo = new Foo(java.util.Arrays.asList("foo", "bar"))
     serialize(foo) should equal ("""{"strings":["foo","bar"]}""")
   }
+
+  it should "serialize ClassWithUnitField" in {
+    serialize(ClassWithUnitField((), 2)) shouldEqual """{"intField":2}"""
+  }
+
+  it should "serialize ClassWithOnlyUnitField" in {
+    serialize(ClassWithOnlyUnitField(())) shouldEqual """{}"""
+  }
 }