add tests

tests/crash_result_iterator.phpt

@@ -0,0 +1,41 @@
+--TEST--
+crash result iterator
+--SKIPIF--
+<?php
+include "_skipif.inc";
+?>
+--FILE--
+<?php
+echo "Test\n";
+
+include "_setup.inc";
+
+$conn = new pq\Connection(PQ_DSN);
+
+$sql = "
+	SELECT id
+	FROM generate_series(1,3) id
+	ORDER BY id ASC
+	LIMIT 5
+";
+
+foreach ($conn->exec($sql) as $row) {
+	var_dump($row);
+}
+?>
+===DONE===
+--EXPECT--
+Test
+array(1) {
+  [0]=>
+  int(1)
+}
+array(1) {
+  [0]=>
+  int(2)
+}
+array(1) {
+  [0]=>
+  int(3)
+}
+===DONE===

tests/crash_stm_reverse_dep.phpt

@@ -0,0 +1,20 @@
+--TEST--
+crash stm reverse dependency from connection
+--SKIPIF--
+<?php 
+include "_skipif.inc";
+?>
+--FILE--
+<?php 
+echo "Test\n";
+
+include "_setup.inc";
+
+$c = new pq\Connection(PQ_DSN);
+$c->s = $c->prepare("test", "SELECT 1");
+
+?>
+===DONE===
+--EXPECT--
+Test
+===DONE===

tests/crash_unbuffered_async_prepare.phpt

@@ -0,0 +1,43 @@
+--TEST--
+crash unbuffered async prepare
+--SKIPIF--
+<?php 
+include "_skipif.inc";
+?>
+--FILE--
+<?php 
+echo "Test\n";
+
+include "_setup.inc";
+
+function complete($c) {
+	do {
+		while ($c->busy) {
+			$r = array($c->socket);
+			$w = $e = null;
+			if (stream_select($r, $w, $e, null)) {
+				$c->poll();
+			}
+		}
+	} while ($c->getResult());
+}
+
+try {
+	$c = new pq\Connection(PQ_DSN);
+	$c->unbuffered = true;
+	
+	$s = $c->prepareAsync("test", "SELECT * from generate_series(1,2)");
+	complete($c);
+	
+	$r = $s->execAsync();
+	complete($c);
+} catch (Exception $e) {
+	echo $e;
+}
+unset($c);
+
+?>
+===DONE===
+--EXPECT--
+Test
+===DONE===