Remove dead code when jupiter updates to opentest4j 1.3.0

[TWiStErRob]

Once opentest4j 1.3.0 is released and jupiter updates its dependency, the following patch will have to be applied: the build will fail because WithRootCauseKtTest.cannot initCause of AssertionFailedError will fail.

Subject: [PATCH] Remove dead code
---
Index: test/internal/build.gradle.kts
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/test/internal/build.gradle.kts b/test/internal/build.gradle.kts
--- a/test/internal/build.gradle.kts	(revision 5d7687e245de8ab87426d309f629bfa44de1bc42)
+++ b/test/internal/build.gradle.kts	(date 1685627110287)
@@ -19,6 +19,7 @@
 	api(libs.junit.api)
 	api(libs.junit.params)
 	runtimeOnly(libs.junit.engine)
+	api("org.opentest4j:opentest4j:1.3.0-RC1")
 
 	api(libs.hamcrest)
 
@@ -30,11 +31,3 @@
 
 	api(libs.jfixture.java)
 }
-
-tasks.named<Test>("test") {
-	if (javaVersion.isJava9Compatible) {
-		// TODEL Java 16 vs AssertionFailedError https://github.com/ota4j-team/opentest4j/issues/70
-		// Example test: WithRootCauseKtTest.`registering a task preConfigures, but does not create it`
-		jvmArgs("--add-opens=java.base/java.lang=ALL-UNNAMED")
-	}
-}
Index: test/internal/src/test/kotlin/net/twisterrob/test/WithRootCauseKtTest.kt
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/test/internal/src/test/kotlin/net/twisterrob/test/WithRootCauseKtTest.kt b/test/internal/src/test/kotlin/net/twisterrob/test/WithRootCauseKtTest.kt
--- a/test/internal/src/test/kotlin/net/twisterrob/test/WithRootCauseKtTest.kt	(revision 5d7687e245de8ab87426d309f629bfa44de1bc42)
+++ b/test/internal/src/test/kotlin/net/twisterrob/test/WithRootCauseKtTest.kt	(date 1685627199920)
@@ -70,20 +70,6 @@
 		}
 	}
 
-	/**
-	 * To verify the presence of the problem in
-	 * [ota4j-team/opentest4j#5](https://github.com/ota4j-team/opentest4j/issues/5#issuecomment-940474063).
-	 */
-	@Test
-	fun `cannot initCause of AssertionFailedError`() {
-		val ex = AssertionFailedError()
-		val cause = Throwable()
-
-		assertThrows<IllegalStateException> {
-			ex.initCause(cause)
-		}
-	}
-
 	@Test
 	fun `can add root cause to AssertionFailedError`() {
 		val ex = AssertionFailedError()
Index: test/internal/src/main/kotlin/net/twisterrob/test/withRootCause.kt
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/test/internal/src/main/kotlin/net/twisterrob/test/withRootCause.kt b/test/internal/src/main/kotlin/net/twisterrob/test/withRootCause.kt
--- a/test/internal/src/main/kotlin/net/twisterrob/test/withRootCause.kt	(revision 5d7687e245de8ab87426d309f629bfa44de1bc42)
+++ b/test/internal/src/main/kotlin/net/twisterrob/test/withRootCause.kt	(date 1685626882629)
@@ -1,17 +1,7 @@
 package net.twisterrob.test
 
-import org.opentest4j.AssertionFailedError
-
 fun Throwable.withRootCause(cause: Throwable): Throwable {
 	require(cause !in generateSequence(this) { it.cause })
-	val rootCause = generateSequence(this) { it.cause }.last()
-	if (rootCause is AssertionFailedError) {
-		// Workaround for https://github.com/ota4j-team/opentest4j/issues/5#issuecomment-940474063.
-		// Can't use constructor, because would need to rebuild the whole chain:
-		// AssertionFailedError(rootCause.message, rootCause.expected, rootCause.actual, cause)
-		val causeField = Throwable::class.java.getDeclaredField("cause").apply { isAccessible = true }
-		causeField.set(rootCause, rootCause)
-	}
-	rootCause.initCause(cause)
+	generateSequence(this) { it.cause }.last().initCause(cause)
 	return this
 }