Fix Predis\Commands\ServerEvalSHA::getScriptHash().

"Predis\Commands\ServerEvalSHA::getScriptHash()" was calculating the hash
while it just needs to return the first argument of the command.

CHANGELOG.md

@@ -11,6 +11,8 @@ v0.7.3 (2012-xx-xx)
   This bug is limited to the above mentioned example and does not affect the
   classes implemented in the `Predis\Distribution` namespace.
 
+- __FIX__: `Predis\Commands\ServerEvalSHA::getScriptHash()` was calculating the
+  hash while it just needs to return the first argument of the command.
 
 v0.7.2 (2012-04-01)
 ===============================================================================

lib/Predis/Commands/ServerEvalSHA.php

@@ -24,4 +24,14 @@ class ServerEvalSHA extends ServerEval
     {
         return 'EVALSHA';
     }
+
+    /**
+     * Returns the SHA1 hash of the body of the script.
+     *
+     * @return string SHA1 hash.
+     */
+    public function getScriptHash()
+    {
+        return $this->getArgument(0);
+    }
 }

tests/Predis/Commands/ServerEvalSHATest.php

@@ -75,6 +75,15 @@ class ServerEvalSHATest extends CommandTestCase
         $this->assertSame($expected, $command->getArguments());
     }
 
+    /**
+     * @group disconnected
+     */
+    public function testGetScriptHash()
+    {
+        $command = $this->getCommandWithArgumentsArray(array($sha1 = sha1('return true')), 0);
+        $this->assertSame($sha1, $command->getScriptHash());
+    }
+
     /**
      * @group connected
      */