Add failing test for GitHub #478

src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/github/failing/GitHub478.kt

@@ -0,0 +1,38 @@
+package com.fasterxml.jackson.module.kotlin.test.github.failing
+
+import com.fasterxml.jackson.annotation.JsonInclude.Include.NON_DEFAULT
+import com.fasterxml.jackson.module.kotlin.jsonMapper
+import com.fasterxml.jackson.module.kotlin.kotlinModule
+import com.fasterxml.jackson.module.kotlin.readValue
+import com.fasterxml.jackson.module.kotlin.test.expectFailure
+import org.junit.ComparisonFailure
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class GitHub478Test {
+    val mapper = jsonMapper {
+        addModule(kotlinModule())
+        serializationInclusion(NON_DEFAULT)
+    }
+
+    data class Data(val flag: Boolean = true)
+
+    @Test
+    fun omitsDefaultValueWhenSerializing() {
+        expectFailure<ComparisonFailure>("GitHub478 has been fixed!") {
+            assertEquals("""{}""", mapper.writeValueAsString(Data()))
+        }
+    }
+
+    @Test
+    fun serializesNonDefaultValue() {
+        expectFailure<ComparisonFailure>("GitHub478 has been fixed!") {
+            assertEquals("""{"flag": false}""", mapper.writeValueAsString(Data(flag = false)))
+        }
+    }
+
+    @Test
+    fun usesDefaultWhenDeserializing() {
+        assertEquals(Data(), mapper.readValue("{}"))
+    }
+}