chore: minor adjustments

Author: zepfred

core/src/test/java/ai/timefold/solver/core/testdomain/TestdataObjectDistanceMeter.java

@@ -0,0 +1,19 @@
+package ai.timefold.solver.core.testdomain;
+
+import ai.timefold.solver.core.impl.heuristic.selector.common.nearby.NearbyDistanceMeter;
+
+public class TestdataObjectDistanceMeter<T extends TestdataObject> implements NearbyDistanceMeter<T, TestdataObject> {
+
+    @Override
+    public double getNearbyDistance(T origin, TestdataObject destination) {
+        return Math.abs(coordinate(destination) - coordinate(origin));
+    }
+
+    static int coordinate(TestdataObject o) {
+        try {
+            return Integer.parseInt(o.getCode());
+        } catch (NumberFormatException e) {
+            return 0;
+        }
+    }
+}

core/src/test/java/ai/timefold/solver/core/testdomain/list/TestdataListUtils.java

@@ -17,6 +17,7 @@
 import ai.timefold.solver.core.impl.domain.entity.descriptor.EntityDescriptor;
 import ai.timefold.solver.core.impl.domain.solution.descriptor.SolutionDescriptor;
 import ai.timefold.solver.core.impl.domain.valuerange.descriptor.ValueRangeDescriptor;
+import ai.timefold.solver.core.impl.domain.variable.descriptor.BasicVariableDescriptor;
 import ai.timefold.solver.core.impl.domain.variable.descriptor.ListVariableDescriptor;
 import ai.timefold.solver.core.impl.heuristic.HeuristicConfigPolicy;
 import ai.timefold.solver.core.impl.heuristic.selector.SelectorTestUtils;
@@ -252,6 +253,16 @@ public static <Solution_> ListVariableDescriptor<Solution_> getListVariableDescr
                 .getGenuineVariableDescriptor("valueList");
     }
 
+    public static <Solution_> BasicVariableDescriptor<Solution_> getBasicVariableDescriptor(
+            InnerScoreDirector<Solution_, ?> scoreDirector) {
+        return (BasicVariableDescriptor<Solution_>) scoreDirector
+                .getSolutionDescriptor()
+                .getGenuineEntityDescriptors()
+                .iterator()
+                .next()
+                .getGenuineVariableDescriptor("value");
+    }
+
     public static <Solution_> EntityDescriptor<Solution_> getEntityDescriptor(
             InnerScoreDirector<Solution_, ?> scoreDirector) {
         return scoreDirector