Test test_save_p_transparent_black on big endian with Pillow 5.1.0

.github/workflows/build.yml

@@ -13,29 +13,8 @@ jobs:
         target:
           - "latest"
         image:
-          # Run slower jobs first to give them a headstart and reduce waiting time
-          - "ubuntu-20.04-focal-arm64v8"
-          - "ubuntu-20.04-focal-ppc64le"
           - "ubuntu-20.04-focal-s390x"
-          # Then run the remainder
-          - "alpine"
-          - "amazon-2-amd64"
-          - "arch"
-          - "centos-7-amd64"
-          - "centos-8-amd64"
-          - "centos-stream-8-amd64"
-          - "debian-10-buster-x86"
-          - "fedora-34-amd64"
-          - "fedora-35-amd64"
-          - "manylinux2014-wheel-build"
-          - "ubuntu-18.04-bionic-amd64"
-          - "ubuntu-20.04-focal-amd64"
-          - "ubuntu-20.04-focal-amd64-valgrind"
         include:
-          - image: "ubuntu-20.04-focal-arm64v8"
-            qemu-arch: "aarch64"
-          - image: "ubuntu-20.04-focal-ppc64le"
-            qemu-arch: "ppc64le"
           - image: "ubuntu-20.04-focal-s390x"
             qemu-arch: "s390x"
 

Makefile.sub

@@ -9,6 +9,7 @@ BRANCH := $(shell git rev-parse --abbrev-ref HEAD)
 build:
 	cp -r ../Pillow/depends .
 	cp test.sh depends
+	cp script.py depends
 	docker build -t $(IMAGENAME):$(BRANCH) .
 
 .PHONY: update

ubuntu-20.04-focal-s390x/script.py

@@ -0,0 +1,11 @@
+from PIL import Image
+im = Image.new("RGBA", (10, 10), (0, 0, 0, 0))
+assert im.getcolors() == [(100, (0, 0, 0, 0))]
+
+im = im.convert("P")
+test_file = "/tmp/temp.png"
+im.save(test_file)
+
+# check if saved image contains same transparency
+with Image.open(test_file) as im:
+    assert len(im.info["transparency"]) == 256

ubuntu-20.04-focal-s390x/test.sh

@@ -1,6 +1,5 @@
 #!/bin/bash
 source /vpy3/bin/activate
-cd /Pillow
-make clean
-make install-coverage
-/usr/bin/xvfb-run -a pytest -vx --cov PIL --cov-report term Tests
+python3 -m pip install Pillow==5.1.0
+python3 -m pip show Pillow
+python3 depends/script.py