diff --git a/tests/caferrari/imagepalettetotruecolor_basic.phpt b/tests/caferrari/imagepalettetotruecolor_basic.phpt
new file mode 100644
index 0000000000000..63a2b51e77d62
--- /dev/null
+++ b/tests/caferrari/imagepalettetotruecolor_basic.phpt
@@ -0,0 +1,22 @@
+--TEST--
+does the imagepalettetotruecollor function realy converts the image palette?
+--CREDITS--
+Carlos André Ferrari <caferrari [at] gmail [dot] com>
+--SKIPIF--
+<?php
+    if (!extension_loaded('gd')) die("skip gd extension not available.");
+?>
+--FILE--
+<?php
+$im = imagecreate(100, 100);
+var_dump(is_resource($im));
+var_dump(imageistruecolor($im));
+var_dump(imagepalettetotruecolor($im));
+var_dump(imageistruecolor($im));
+imagedestroy($im);
+?>
+--EXPECT--
+bool(true)
+bool(false)
+bool(true)
+bool(true)
diff --git a/tests/caferrari/imagepalettetotruecolor_error1.phpt b/tests/caferrari/imagepalettetotruecolor_error1.phpt
new file mode 100644
index 0000000000000..3c994e59a21b3
--- /dev/null
+++ b/tests/caferrari/imagepalettetotruecolor_error1.phpt
@@ -0,0 +1,14 @@
+--TEST--
+imagepalettetotruecollor must return an error if no resource is given
+--CREDITS--
+Carlos André Ferrari <caferrari [at] gmail [dot] com>
+--SKIPIF--
+<?php
+    if (!extension_loaded('gd')) die("skip gd extension not available.");
+?>
+--FILE--
+<?php
+imagepalettetotruecolor();
+?>
+--EXPECTF--
+Warning: imagepalettetotruecolor() expects exactly 1 parameter, 0 given in %s on line %d
diff --git a/tests/caferrari/imagepalettetotruecolor_error2.phpt b/tests/caferrari/imagepalettetotruecolor_error2.phpt
new file mode 100644
index 0000000000000..7a9a9ce574998
--- /dev/null
+++ b/tests/caferrari/imagepalettetotruecolor_error2.phpt
@@ -0,0 +1,14 @@
+--TEST--
+imagepalettetotruecollor must return an error if not a resource is given
+--CREDITS--
+Carlos André Ferrari <caferrari [at] gmail [dot] com>
+--SKIPIF--
+<?php
+    if (!extension_loaded('gd')) die("skip gd extension not available.");
+?>
+--FILE--
+<?php
+imagepalettetotruecolor("bla");
+?>
+--EXPECTF--
+Warning: imagepalettetotruecolor() expects parameter 1 to be resource, string given in %s on line %d
diff --git a/tests/caferrari/imagepalettetotruecolor_error3.phpt b/tests/caferrari/imagepalettetotruecolor_error3.phpt
new file mode 100644
index 0000000000000..42a7e7177364b
--- /dev/null
+++ b/tests/caferrari/imagepalettetotruecolor_error3.phpt
@@ -0,0 +1,15 @@
+--TEST--
+imagepalettetotruecollor must return an error if not an image resource is given
+--CREDITS--
+Carlos André Ferrari <caferrari [at] gmail [dot] com>
+--SKIPIF--
+<?php
+    if (!extension_loaded('gd')) die("skip gd extension not available.");
+?>
+--FILE--
+<?php
+$im = fopen('php://memory', 'w');
+imagepalettetotruecolor($im);
+?>
+--EXPECTF--
+Warning: imagepalettetotruecolor(): supplied resource is not a valid Image resource in %s on line %d