added test for pdo construct without server specified

test/pdo_sqlsrv/pdo_construct_no_server.phpt

@@ -0,0 +1,22 @@
+--TEST--
+Test PDO::__Construct without specifying the Server
+--SKIPIF--
+
+--FILE--
+<?php
+  
+require_once("autonomous_setup.php");
+try 
+{   
+    $database = "tempdb";
+    // Try to connect with no server specific
+    @$conn = new PDO( "sqlsrv:Database = $database", $username, $password );
+}
+catch( PDOException $e ) {
+    print_r( ($e->errorInfo)[2] );
+}
+?> 
+
+--EXPECT--
+
+Server keyword was not specified in the DSN string.