Gradle config cache: resources (#15329)

Author: trask

instrumentation/resources/library/build.gradle.kts

@@ -88,10 +88,8 @@ testing {
 tasks {
   test {
     dependsOn(jar)
-    doFirst {
-      // use the final jar instead of directories with built classes to test the mrjar functionality
-      classpath = jar.get().outputs.files + classpath
-    }
+    // use the final jar instead of directories with built classes to test the mrjar functionality
+    classpath = project.files(jar) + classpath
     systemProperty("testSecret", "test")
     systemProperty("testPassword", "test")
     systemProperty("testNotRedacted", "test")