fix merge issues

Author: staudtMarius

src/main/java/edu/ie3/datamodel/utils/validation/EnergyManagementValidationUtils.java

@@ -0,0 +1,48 @@
+/*
+ * © 2021. TU Dortmund University,
+ * Institute of Energy Systems, Energy Efficiency and Energy Economics,
+ * Research group Distribution grid planning and operation
+*/
+package edu.ie3.datamodel.utils.validation;
+
+import edu.ie3.datamodel.exceptions.InvalidEntityException;
+import edu.ie3.datamodel.exceptions.ValidationException;
+import edu.ie3.datamodel.models.input.EmInput;
+import edu.ie3.datamodel.utils.Try;
+import java.util.ArrayList;
+import java.util.List;
+
+public class EnergyManagementValidationUtils extends ValidationUtils {
+
+  /** Private Constructor as this class is not meant to be instantiated */
+  private EnergyManagementValidationUtils() {
+    throw new IllegalStateException("Don't try and instantiate a Utility class.");
+  }
+
+  /**
+   * Validates a energy management unit if:
+   *
+   * <ul>
+   *   <li>its control strategy is not null
+   * </ul>
+   *
+   * A "distribution" method, that forwards the check request to specific implementations to fulfill
+   * the checking task, based on the class of the given object.
+   *
+   * @param energyManagement EmInput to validate
+   * @return a list of try objects either containing an {@link ValidationException} or an empty
+   *     Success
+   */
+  protected static List<Try<Void, ? extends ValidationException>> check(EmInput energyManagement) {
+    List<Try<Void, ? extends ValidationException>> exceptions = new ArrayList<>();
+
+    exceptions.add(
+        Try.ofVoid(
+            energyManagement.getControlStrategy() == null,
+            () ->
+                new InvalidEntityException(
+                    "No control strategy of energy management defined for", energyManagement)));
+
+    return exceptions;
+  }
+}

src/test/groovy/edu/ie3/datamodel/utils/validation/EmValidationUtilsTest.groovy

@@ -0,0 +1,41 @@
+/*
+ * © 2025. TU Dortmund University,
+ * Institute of Energy Systems, Energy Efficiency and Energy Economics,
+ * Research group Distribution grid planning and operation
+ */
+package edu.ie3.datamodel.utils.validation
+
+import edu.ie3.datamodel.exceptions.InvalidEntityException
+import edu.ie3.datamodel.exceptions.ValidationException
+import edu.ie3.datamodel.utils.Try
+import edu.ie3.test.common.GridTestData
+import spock.lang.Specification
+
+class EmValidationUtilsTest extends Specification {
+
+  def "Smoke Test: Correct energy management system throws no exception"() {
+    given:
+    def em = GridTestData.energyManagementInput
+
+    when:
+    List<Try<Void, ? extends ValidationException>> tries = EnergyManagementValidationUtils.check(em)
+
+    then:
+    tries.every { it.success }
+  }
+
+  def "The check method recognizes all potential errors for an energy management input"() {
+    when:
+    List<Try<Void, ? extends ValidationException>> exceptions = EnergyManagementValidationUtils.check(invalidEm).stream().filter { it -> it.failure }.toList()
+
+    then:
+    exceptions.size() == expectedSize
+    Exception ex = exceptions.get(0).exception.get()
+    ex.class == expectedException.class
+    ex.message == expectedException.message
+
+    where:
+    invalidEm                                                            	      || expectedSize || expectedException
+    GridTestData.energyManagementInput.copy().controlStrategy(null).build()       || 1            || new InvalidEntityException("No control strategy of energy management defined for", invalidEm)
+  }
+}