performance improvement

src/main/java/com/ocadotechnology/gembus/test/Arranger.java

@@ -57,7 +57,8 @@ public static <T> T some(final Class<T> type, final String... excludedFields) {
      * @return a random instance of the given type
      */
     public static <T> T some(final Class<T> type, final Map<String, Supplier<?>> overrides) {
-        T result = random.nextObject(type);
+        String[] toIgnore = overrides.keySet().toArray(new String[overrides.size()]);
+        T result = random.nextObject(type, toIgnore);
         OverridesHelper.applyOverrides(result, overrides);
         return result;
     }

src/test/java/com/ocadotechnology/gembus/test/ArrangerTestEnumSet.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright © 2020 Ocado ([email protected])
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.ocadotechnology.gembus.test;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.util.EnumSet;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.Supplier;
+
+import static com.ocadotechnology.gembus.test.Arranger.some;
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class ArrangerTestEnumSet {
+
+    @Test
+    @DisplayName("SHOULD not try to initialize file WHEN an override is delivered")
+    void skipEnumSet() {
+        //when
+        Map<String, Supplier<?>> overrides = new HashMap<String, Supplier<?>>(){{
+            put("enumeration", () -> null);
+        }};
+        ClassWithEnumSetField some = some(ClassWithEnumSetField.class, overrides);
+
+        //then
+        assertThat(some.txt).isNotBlank();
+        assertThat(some.enumeration).isNull();
+    }
+}
+
+class ClassWithEnumSetField {
+    String txt;
+    EnumSet<SomeEnum> enumeration;
+}
+
+enum SomeEnum {
+    ONE,
+    TWO,
+    THREE
+}