DATAREDIS-1138 - Fix detection whether XREAD is blocking.

We now correctly check if a BLOCK option is configured using a timeout of zero or higher. Previously we only checked if the configured value is greater than zero and didn't consider that a timeout of zero blocks indefinitely.

Original Pull Request: #528

src/test/java/org/springframework/data/redis/connection/stream/StreamReadOptionsUnitTests.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 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.data.redis.connection.stream;
+
+import static org.assertj.core.api.Assertions.*;
+
+import java.time.Duration;
+
+import org.junit.Test;
+
+/**
+ * Unit tests for {@link StreamReadOptions}.
+ * 
+ * @author Mark Paluch
+ */
+public class StreamReadOptionsUnitTests {
+
+	@Test // DATAREDIS-1138
+	public void shouldConsiderBlocking() {
+
+		assertThat(StreamReadOptions.empty().isBlocking()).isFalse();
+		assertThat(StreamReadOptions.empty().block(Duration.ofSeconds(1)).isBlocking()).isTrue();
+		assertThat(StreamReadOptions.empty().block(Duration.ZERO).isBlocking()).isTrue();
+	}
+}