Polish RedisOperationsSessionRepository ConnectionFactory Constructor

Add test and remove unnecessary comment.

Relates to gh-61

spring-session/src/test/java/org/springframework/session/data/redis/RedisOperationsSessionRepositoryTests.java

@@ -23,6 +23,8 @@ import org.mockito.ArgumentCaptor;
 import org.mockito.Captor;
 import org.mockito.Mock;
 import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.data.redis.connection.RedisConnection;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
 import org.springframework.data.redis.core.BoundHashOperations;
 import org.springframework.data.redis.core.BoundSetOperations;
 import org.springframework.data.redis.core.RedisOperations;
@@ -33,6 +35,10 @@ import org.springframework.session.data.redis.RedisOperationsSessionRepository.R
 
 @RunWith(MockitoJUnitRunner.class)
 public class RedisOperationsSessionRepositoryTests {
+    @Mock
+    RedisConnectionFactory factory;
+    @Mock
+    RedisConnection connection;
     @Mock
     RedisOperations<String,ExpiringSession> redisOperations;
     @Mock
@@ -58,6 +64,17 @@ public class RedisOperationsSessionRepositoryTests {
         new RedisOperationsSessionRepository(null);
     }
 
+    // gh-61
+    @Test
+    public void constructorConnectionFactory() {
+        redisRepository = new RedisOperationsSessionRepository(factory);
+        RedisSession session = redisRepository.createSession();
+
+        when(factory.getConnection()).thenReturn(connection);
+
+        redisRepository.save(session);
+    }
+
     @Test
     public void createSessionDefaultMaxInactiveInterval() throws Exception {
         ExpiringSession session = redisRepository.createSession();