Implement isPaused method in DefaultBinding

Add @author

Resolves #2061

spring-cloud-stream/src/main/java/org/springframework/cloud/stream/binder/DefaultBinding.java

@@ -38,6 +38,7 @@ import org.springframework.util.StringUtils;
  * @author Gary Russell
  * @author Marius Bogoevici
  * @author Oleg Zhurakousky
+ * @author Myeonghyeon Lee
  * @see org.springframework.cloud.stream.annotation.EnableBinding
  */
 
@@ -117,6 +118,11 @@ public class DefaultBinding<T> implements Binding<T> {
 		return this.lifecycle instanceof Pausable;
 	}
 
+	@Override
+	public boolean isPaused() {
+		return this.paused;
+	}
+
 	@Override
 	public final synchronized void start() {
 		if (!this.isRunning()) {

spring-cloud-stream/src/test/java/org/springframework/cloud/stream/binder/DefaultBinderTests.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2020-2020 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
+ *
+ *      https://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.cloud.stream.binder;
+
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ *
+ * @author Myeonghyeon Lee
+ *
+ */
+public class DefaultBinderTests {
+
+    @Test
+    public void testDefaultBinderIsPaused() {
+        @SuppressWarnings({ "rawtypes" })
+        DefaultBinding<?> binding = new DefaultBinding<>("foo", "bar", "target", (Binding) () -> {
+        });
+
+        assertThat(binding.isPaused()).isFalse();
+
+        binding.pause();
+
+        assertThat(binding.isPaused()).isTrue();
+    }
+}