fix: added test coverage for ServiceConfig

Signed-off-by: Matt Peterson <[email protected]>

server/src/main/java/com/hedera/block/server/service/ServiceConfig.java

@@ -20,4 +20,10 @@
 import com.swirlds.config.api.ConfigProperty;
 
 @ConfigData("service")
-public record ServiceConfig(@ConfigProperty(defaultValue = "1000") int delayMillis) {}
+public record ServiceConfig(@ConfigProperty(defaultValue = "1000") int delayMillis) {
+    public ServiceConfig {
+        if (delayMillis <= 0) {
+            throw new IllegalArgumentException("Delay milliseconds must be greater than 0");
+        }
+    }
+}

server/src/test/java/com/hedera/block/server/service/ServiceConfigTest.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2024 Hedera Hashgraph, LLC
+ *
+ * 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.hedera.block.server.service;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.Test;
+
+public class ServiceConfigTest {
+    @Test
+    public void testServiceConfig_happyPath() {
+        ServiceConfig serviceConfig = new ServiceConfig(2000);
+        assertEquals(2000, serviceConfig.delayMillis());
+    }
+
+    @Test
+    public void testServiceConfig_negativeDelayMillis() {
+        IllegalArgumentException exception =
+                assertThrows(IllegalArgumentException.class, () -> new ServiceConfig(-1));
+        assertEquals("Delay milliseconds must be greater than 0", exception.getMessage());
+    }
+}