For some reason, class and tests for BITCOUNT were missing...

lib/Predis/Commands/StringBitCount.php

@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) Daniele Alessandri <suppakilla@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Predis\Commands;
+
+/**
+ * @link http://redis.io/commands/bitcount
+ * @author Daniele Alessandri <suppakilla@gmail.com>
+ */
+class StringBitCount extends PrefixableCommand
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getId()
+    {
+        return 'BITCOUNT';
+    }
+}

tests/Predis/Commands/StringBitCountTest.php

@@ -0,0 +1,108 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) Daniele Alessandri <suppakilla@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Predis\Commands;
+
+use \PHPUnit_Framework_TestCase as StandardTestCase;
+
+/**
+ * @group commands
+ * @group realm-string
+ */
+class StringBitCountTest extends CommandTestCase
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function getExpectedCommand()
+    {
+        return 'Predis\Commands\StringBitCount';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function getExpectedId()
+    {
+        return 'BITCOUNT';
+    }
+
+    /**
+     * @group disconnected
+     */
+    public function testFilterArguments()
+    {
+        $arguments = array('key', 0, 10);
+        $expected = array('key', 0, 10);
+
+        $command = $this->getCommand();
+        $command->setArguments($arguments);
+
+        $this->assertSame($expected, $command->getArguments());
+    }
+
+    /**
+     * @group disconnected
+     */
+    public function testParseResponse()
+    {
+        $raw = 10;
+        $expected = 10;
+
+        $command = $this->getCommand();
+
+        $this->assertSame($expected, $command->parseResponse($raw));
+    }
+
+    /**
+     * @group disconnected
+     */
+    public function testPrefixKeys()
+    {
+        $arguments = array('key', 0, 10);
+        $expected = array('prefix:key', 0, 10);
+
+        $command = $this->getCommandWithArgumentsArray($arguments);
+        $command->prefixKeys('prefix:');
+
+        $this->assertSame($expected, $command->getArguments());
+    }
+
+    /**
+     * @group connected
+     */
+    public function testReturnsNumberOfBitsSet()
+    {
+        $redis = $this->getClient();
+
+        $redis->setbit('key', 1, 1);
+        $redis->setbit('key', 10, 1);
+        $redis->setbit('key', 16, 1);
+        $redis->setbit('key', 22, 1);
+        $redis->setbit('key', 32, 1);
+
+        $this->assertSame(5, $redis->bitcount('key'), 'Count bits set (without range)');
+        $this->assertSame(3, $redis->bitcount('key', 2, 4), 'Count bits set (with range)');
+    }
+
+    /**
+     * @group connected
+     * @expectedException Predis\ServerException
+     * @expectedExceptionMessage ERR Operation against a key holding the wrong kind of value
+     */
+    public function testThrowsExceptionOnWrongType()
+    {
+        $redis = $this->getClient();
+
+        $redis->lpush('key', 'list');
+        $redis->bitcount('key');
+    }
+}