From e362818d91a6d985b9cf3ac88210f777ff2066ab Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Mon, 7 Aug 2023 12:28:13 +1000
Subject: [PATCH] Added test

---
 Tests/test_file_pdf.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Tests/test_file_pdf.py b/Tests/test_file_pdf.py
index 9c8e90b7e21..4f7b09af26a 100644
--- a/Tests/test_file_pdf.py
+++ b/Tests/test_file_pdf.py
@@ -48,6 +48,22 @@ def test_save_alpha(tmp_path, mode):
     helper_save_as_pdf(tmp_path, mode)
 
 
+def test_p_alpha(tmp_path):
+    # Arrange
+    outfile = str(tmp_path / "temp.pdf")
+    with Image.open("Tests/images/pil123p.png") as im:
+        assert im.mode == "P"
+        assert isinstance(im.info["transparency"], bytes)
+
+        # Act
+        im.save(outfile)
+
+    # Assert
+    with open(outfile, "rb") as fp:
+        contents = fp.read()
+    assert b"SMask" in contents
+
+
 def test_monochrome(tmp_path):
     # Arrange
     mode = "1"