Add unit tests for -inf/inf/+inf WEIGHTS

Addresses issue phpredis#336

Author: michael-grunder

tests/TestRedis.php

@@ -1974,11 +1974,33 @@ public function testZX() {
 
 	$this->assertTrue($this->redis->zunion('key3', array('key1', 'key2'), array(2, 3.0)) === 3);
 
-
 	$this->redis->delete('key1');
 	$this->redis->delete('key2');
 	$this->redis->delete('key3');
 
+    // Test 'inf', '-inf', and '+inf' weights (GitHub issue #336)
+    $this->redis->zadd('key1', 1, 'one', 2, 'two', 3, 'three');
+    $this->redis->zadd('key2', 3, 'three', 4, 'four', 5, 'five');
+
+    // Make sure phpredis handles these weights
+    $this->assertTrue($this->redis->zunion('key3', array('key1','key2'), array(1, 'inf'))  === 5);
+    $this->assertTrue($this->redis->zunion('key3', array('key1','key2'), array(1, '-inf')) === 5);
+    $this->assertTrue($this->redis->zunion('key3', array('key1','key2'), array(1, '+inf')) === 5);
+
+    // Now, confirm that they're being sent, and that it works
+    $arr_weights = Array('inf','-inf','+inf');
+
+    foreach($arr_weights as $str_weight) {
+        $r = $this->redis->zunionstore('key3', array('key1','key2'), array(1,$str_weight));
+        $this->assertTrue($r===5);
+        $r = $this->redis->zrangebyscore('key3', '(-inf', '(inf',array('withscores'=>true));
+        $this->assertTrue(count($r)===2);
+        $this->assertTrue(isset($r['one']));
+        $this->assertTrue(isset($r['two']));
+    }
+
+    $this->redis->del('key1','key2','key3');
+
 	$this->redis->zadd('key1', 2000.1, 'one');
 	$this->redis->zadd('key1', 3000.1, 'two');
 	$this->redis->zadd('key1', 4000.1, 'three');