Added test case for FAIL_ON_NULL_FOR_PRIMITIVES

from FasterXML/jackson-module-kotlin#868

Author: k163377

src/test/kotlin/io/github/projectmapk/jackson/module/kogera/zIntegration/deser/FailNullForPrimitiveTest.kt

@@ -9,24 +9,42 @@ import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.assertThrows
 
 private class FailNullForPrimitiveTest {
-    data class Dto(
+    val mapper = jacksonObjectMapper()
+        .enable(DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES)
+
+    data class NoDefaultValue(
         val foo: Int,
         val bar: Int?
     )
 
     @Test
-    fun test() {
-        val mapper = jacksonObjectMapper()
-            .enable(DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES)
+    fun noDefaultValueTest() {
+        // If no default value is set, it will fail if undefined or null is entered
+        assertThrows<MismatchedInputException> {
+            mapper.readValue<NoDefaultValue>("{}")
+        }
 
         assertThrows<MismatchedInputException> {
-            mapper.readValue<Dto>("{}")
+            mapper.readValue<NoDefaultValue>("""{"foo":null}""")
         }
 
+        assertEquals(NoDefaultValue(0, null), mapper.readValue<NoDefaultValue>("""{"foo":0}"""))
+    }
+
+    data class HasDefaultValue(
+        val foo: Int = -1,
+        val bar: Int? = -1
+    )
+
+    @Test
+    fun hasDefaultValueTest() {
+        // If a default value is set, an input of undefined will succeed, but null will fail
+        assertEquals(HasDefaultValue(-1, -1), mapper.readValue<HasDefaultValue>("{}"))
+
         assertThrows<MismatchedInputException> {
-            mapper.readValue<Dto>("""{"foo":null}""")
+            mapper.readValue<HasDefaultValue>("""{"foo":null}""")
         }
 
-        assertEquals(Dto(0, null), mapper.readValue<Dto>("""{"foo":0}"""))
+        assertEquals(HasDefaultValue(0, null), mapper.readValue<HasDefaultValue>("""{"foo":0, "bar":null}"""))
     }
 }