Migrate to JUnit5 notation

from https://github.com/ProjectMapK/jackson-module-kogera/blob/ecc766d97dc4c2bec574fba7cc6bdeacc2b07c29/src/test/kotlin/io/github/projectmapk/jackson/module/kogera/zPorted/test/github/failing/GitHub478.kt

Author: k163377

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

@@ -5,7 +5,6 @@ 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.jupiter.api.Test
 import kotlin.test.assertEquals
 
@@ -19,14 +18,14 @@ class GitHub478Test {
 
     @Test
     fun omitsDefaultValueWhenSerializing() {
-        expectFailure<ComparisonFailure>("GitHub478 has been fixed!") {
+        expectFailure<AssertionError>("GitHub478 has been fixed!") {
             assertEquals("""{}""", mapper.writeValueAsString(Data()))
         }
     }
 
     @Test
     fun serializesNonDefaultValue() {
-        expectFailure<ComparisonFailure>("GitHub478 has been fixed!") {
+        expectFailure<AssertionError>("GitHub478 has been fixed!") {
             assertEquals("""{"flag": false}""", mapper.writeValueAsString(Data(flag = false)))
         }
     }