Changing Year instance representation - from String to Int

instances/src/main/scala/pl/iterators/kebs/instances/TimeInstances.scala

@@ -15,7 +15,7 @@ trait TimeInstances
     with OffsetTimeString
     with PeriodString
     with YearMonthString
-    with YearString
+    with YearInt
     with ZonedDateTimeString
     with ZoneIdString
     with ZoneOffsetString

instances/src/main/scala/pl/iterators/kebs/instances/time/YearInt.scala

@@ -0,0 +1,14 @@
+package pl.iterators.kebs.instances.time
+
+import pl.iterators.kebs.instances.InstanceConverter
+import pl.iterators.kebs.instances.time.YearInt.YearFormat
+
+import java.time.Year
+
+trait YearInt {
+  implicit val yearFormatter: InstanceConverter[Year, Int] =
+    InstanceConverter[Year, Int](_.getValue, Year.of, Some(YearFormat))
+}
+object YearInt {
+  private[instances] val YearFormat = "ISO-8601 standard format e.g. 2007"
+}

instances/src/test/scala/pl/iterators/kebs/instances/time/TimeInstancesTests.scala

@@ -185,18 +185,18 @@ class TimeInstancesTests extends AnyFunSuite with Matchers with TimeInstances {
     assertThrows[DecodeErrorException](ico.decode(value))
   }
 
-  test("Year to String") {
-    val ico   = implicitly[InstanceConverter[Year, String]]
-    val value = "2007"
-    val obj   = Year.parse(value)
+  test("Year to Int") {
+    val ico   = implicitly[InstanceConverter[Year, Int]]
+    val value = 2007
+    val obj   = Year.of(value)
 
     ico.encode(obj) shouldBe value
     ico.decode(value) shouldBe obj
   }
 
   test("Year wrong format exception") {
-    val ico   = implicitly[InstanceConverter[Year, String]]
-    val value = "NotAYear"
+    val ico   = implicitly[InstanceConverter[Year, Int]]
+    val value = Int.MinValue
 
     assertThrows[DecodeErrorException](ico.decode(value))
   }

spray-json/src/test/scala/instances/TimeInstancesTests.scala

@@ -226,18 +226,18 @@ class TimeInstancesTests extends AnyFunSuite with Matchers with DefaultJsonProto
 
   test("Year standard format") {
     val jf    = implicitly[JsonFormat[Year]]
-    val value = "2007"
-    val obj   = Year.parse(value)
+    val value = 2007
+    val obj   = Year.of(value)
 
-    jf.write(obj) shouldBe JsString(value)
-    jf.read(JsString(value)) shouldBe obj
+    jf.write(obj) shouldBe JsNumber(value)
+    jf.read(JsNumber(value)) shouldBe obj
   }
 
   test("Year wrong format exception") {
     val jf    = implicitly[JsonFormat[Year]]
-    val value = "NotAYear"
+    val value = Int.MinValue
 
-    assertThrows[DecodeErrorException](jf.read(JsString(value)))
+    assertThrows[DecodeErrorException](jf.read(JsNumber(value)))
   }
 
   test("YearMonth standard format") {