DATAREDIS-402 - RedisCache should not expire known keys in case ttl of element is not set.

We now skip defining expire on known keys set in case element is eternal.

Original pull request: #141.

src/test/java/org/springframework/data/redis/cache/RedisCacheUnitTests.java

@@ -129,4 +129,16 @@ public class RedisCacheUnitTests {
 		verify(connectionMock, times(1)).eval(any(byte[].class), eq(ReturnType.INTEGER), eq(0),
 				eq((PREFIX + "*").getBytes()));
 	}
+
+	/**
+	 * @see DATAREDIS-402
+	 */
+	@Test
+	public void putShouldNotExpireKnownKeysSetWhenTtlIsZero() {
+
+		cache = new RedisCache(CACHE_NAME, NO_PREFIX_BYTES, templateSpy, 0L);
+		cache.put(KEY, VALUE);
+
+		verify(connectionMock, never()).expire(eq(KNOWN_KEYS_SET_NAME_BYTES), anyLong());
+	}
 }