Adding testcases to validate imageloadfont input parameter validation, tests were developed at #tek11 testfest

ext/gd/tests/imageloadfont_error1.phpt

@@ -0,0 +1,15 @@
+--TEST--
+Testing that imageloadfont() breaks on non-string first parameter
+--CREDITS--
+Neveo Harrison <neveoo [at] gmail [dot] com> #testfest #tek11
+--SKIPIF--
+<?php 
+	if (!extension_loaded("gd")) die("skip GD not present");
+?>
+--FILE--
+<?php
+var_dump( imageloadfont(array()) );
+?>
+--EXPECTF--
+Warning: imageloadfont() expects parameter 1 to be string, array given in %s on line %d
+NULL

ext/gd/tests/imageloadfont_error2.phpt

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+--TEST--
+Testing that imageloadfont() breaks on invalid file passed as first argument
+--CREDITS--
+Austin Drouare <austin.drouare [at] gmail [dot] com> #testfest #tek11
+--SKIPIF--
+<?php 
+	if (!extension_loaded("gd")) die("skip GD not present");
+?>
+--FILE--
+<?php
+var_dump( imageloadfont('\src\invalidfile.font') );
+?>
+--EXPECTF--
+Warning: imageloadfont(\src\invalidfile.font): failed to open stream: No such file or directory in %s on line %d
+bool(false)