Add test cases for Kotlin private constructor instantiation edge cases.

Add two test cases to demonstrate a bug in Kotlin constructor resolution when dealing with private constructors.

Closes #3389
Original pull request: #3390

Signed-off-by: Edward Poot <edwardmp@gmail.com>

Author: edwardmp

src/test/kotlin/org/springframework/data/mapping/model/InlineClasses.kt

@@ -20,6 +20,7 @@ import java.time.LocalDate
 
 /**
  * @author Mark Paluch
+ * @author Edward Poot
  */
 @JvmInline
 value class MyValueClass(val id: String)
@@ -46,6 +47,10 @@ data class WithMyValueClass(val id: MyValueClass) {
 	// ---------
 }
 
+data class WithMyValueClassPrivateConstructor private constructor(val id: MyValueClass)
+
+data class WithMyValueClassPrivateConstructorAndDefaultValue private constructor(val id: MyValueClass = MyValueClass("id"))
+
 @JvmInline
 value class MyNullableValueClass(val id: String? = "id")
 

src/test/kotlin/org/springframework/data/mapping/model/KotlinClassGeneratingEntityInstantiatorUnitTests.kt

@@ -33,6 +33,7 @@ import kotlin.reflect.KClass
  *
  * @author Mark Paluch
  * @author Sebastien Deleuze
+ * @author Edward Poot
  */
 @Suppress("UNCHECKED_CAST")
 class KotlinClassGeneratingEntityInstantiatorUnitTests {
@@ -192,6 +193,24 @@ class KotlinClassGeneratingEntityInstantiatorUnitTests {
 		assertThat(instance.id.id).isEqualTo("hello")
 	}
 
+	@Test // GH-3389
+	fun `should use private default constructor for types using value class`() {
+
+		every { provider.getParameterValue<String>(any()) } returns "hello"
+		val instance = construct(WithMyValueClassPrivateConstructor::class)
+
+		assertThat(instance.id.id).isEqualTo("hello")
+	}
+
+	@Test // GH-3389
+	fun `should use private default constructor for types using value class with default value`() {
+
+		every { provider.getParameterValue<String>(any()) } returns "hello"
+		val instance = construct(WithMyValueClassPrivateConstructorAndDefaultValue::class)
+
+		assertThat(instance.id.id).isEqualTo("hello")
+	}
+
 	@Test
 	fun `should use default constructor for types using nullable value class`() {