added tests for invalid connection option and invalid transaction isolation value

test/pdo_sqlsrv/pdo_construct_TransactionIsolation_invalid_value.phpt

@@ -0,0 +1,37 @@
+--TEST--
+Test PDO::__Construct connection option TransactionIsolation with invalid value
+--SKIPIF--
+
+--FILE--
+<?php
+function Connect($value) {
+    require("autonomous_setup.php");
+    $database = "tempdb";
+    $dsn = "sqlsrv:Server = $serverName;" .
+           "Database = $database;" .
+           "TransactionIsolation = $value";
+    $conn = new PDO( $dsn, $username, $password );
+    $conn = NULL;
+}
+
+// TEST BEGIN
+try {
+Connect("INVALID_KEY");
+  
+  echo "Test Successful";
+}
+catch( PDOException $e ) {
+    var_dump( $e->errorInfo );
+}
+?> 
+
+--EXPECT--
+
+array(3) {
+  [0]=>
+  string(5) "IMSSP"
+  [1]=>
+  int(-63)
+  [2]=>
+  string(88) "An invalid value was specified for the keyword 'TransactionIsolation' in the DSN string."
+}

test/pdo_sqlsrv/pdo_invalid_conn_opt.phpt

@@ -1,5 +1,5 @@
 --TEST--
-Test PDO::__Construct by passing connection options
+Test PDO::__Construct with invalid connection option
 --SKIPIF--
 
 --FILE--
@@ -21,7 +21,6 @@ try
 }
 catch( PDOException $e ) {
     var_dump( $e->errorInfo );
-    exit;
 }
 ?>