added missing dependencies for knapsack test

src/test/java/edu/kit/provideq/toolbox/api/KnapsackSolversTest.java

@@ -8,15 +8,17 @@
 import edu.kit.provideq.toolbox.meta.ProblemManagerProvider;
 import edu.kit.provideq.toolbox.meta.ProblemSolver;
 import edu.kit.provideq.toolbox.meta.ProblemState;
+import java.time.Duration;
+import java.util.stream.Stream;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.TestInstance;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
 import org.springframework.beans.factory.annotation.Autowired;
-
-import java.time.Duration;
-import java.util.stream.Stream;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.web.reactive.server.WebTestClient;
 
 @TestInstance(TestInstance.Lifecycle.PER_CLASS)
 @SpringBootTest