fixed compilation

Author: arcuri82

core-it/src/test/kotlin/org/evomaster/core/problem/rest/SamplerVerifierTest.kt

@@ -8,6 +8,8 @@ import com.netflix.governator.guice.LifecycleInjector
 import org.evomaster.client.java.controller.api.dto.*
 import org.evomaster.client.java.controller.api.dto.database.operations.*
 import org.evomaster.client.java.controller.api.dto.problem.RestProblemDto
+import org.evomaster.client.java.controller.api.dto.problem.param.DeriveParamResponseDto
+import org.evomaster.client.java.controller.api.dto.problem.param.DerivedParamChangeReqDto
 import org.evomaster.client.java.controller.api.dto.problem.rpc.ScheduleTaskInvocationsDto
 import org.evomaster.client.java.controller.api.dto.problem.rpc.ScheduleTaskInvocationsResult
 import org.evomaster.core.BaseModule
@@ -454,6 +456,10 @@ class SamplerVerifierTest {
         override fun close() {
         }
 
+        override fun deriveParams(deriveParams: List<DerivedParamChangeReqDto>): List<DeriveParamResponseDto> {
+            return listOf()
+        }
+
         override fun invokeScheduleTasksAndGetResults(dtos: ScheduleTaskInvocationsDto): ScheduleTaskInvocationsResult? {
             return null
         }