migrate test

downgradetest/build.gradle.kts

@@ -0,0 +1,33 @@
+plugins {
+    "java"
+}
+
+base {
+    archivesName = "downgradetest"
+}
+version = "1.0.0"
+
+val testVersion = JavaVersion.toVersion(project.properties["testVersion"] as String)
+
+java {
+    sourceCompatibility = testVersion
+    targetCompatibility = testVersion
+}
+
+tasks.compileJava {
+    options.encoding = "UTF-8"
+
+    javaCompiler = javaToolchains.compilerFor {
+        languageVersion.set(JavaLanguageVersion.of(testVersion.majorVersion))
+    }
+}
+
+val removeLibs by tasks.registering {
+    doLast {
+        delete(fileTree("dir" to "build/libs", "include" to "**/*.jar"))
+    }
+}
+
+tasks.jar {
+    dependsOn(removeLibs)
+}