GH-2459: Resolve Sonar Issues

Code coverage.

Author: garyrussell

spring-kafka/src/test/java/org/springframework/kafka/listener/ErrorHandlingCoverageTests.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2017 the original author or authors.
+ *
+ * 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 org.springframework.kafka.listener;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * @author Gary Russell
+ * @since 2.9.3
+ *
+ */
+public class ErrorHandlingCoverageTests {
+
+	@Test
+	void coverageDefault() {
+		DefaultErrorHandler eh = new DefaultErrorHandler();
+		eh.addNotRetryableExceptions(IllegalStateException.class);
+		eh.setClassifications(Map.of(IllegalArgumentException.class, false), false);
+		assertThat(eh.removeClassification(IllegalStateException.class)).isNull();
+		assertThat(eh.removeClassification(IllegalArgumentException.class)).isFalse();
+	}
+
+}