Gate isal test dependency to CPython (#12589)

Author: bdraco

CHANGES/12589.contrib.rst

@@ -0,0 +1,7 @@
+Restricted the ``isal`` test dependency to CPython, since
+``isal`` 1.8.0 stopped publishing PyPy wheels and the source
+build requires ``nasm``, which is not available on the CI
+runners. The ``parametrize_zlib_backend`` fixture already
+calls ``pytest.importorskip``, so PyPy continues to exercise
+the ``zlib`` and ``zlib_ng`` backends with no further
+changes -- by :user:`bdraco`.

requirements/constraints.txt

@@ -109,7 +109,7 @@ imagesize==2.0.0
     # via sphinx
 iniconfig==2.3.0
     # via pytest
-isal==1.7.2 ; python_version < "3.14"
+isal==1.7.2 ; python_version < "3.14" and implementation_name == "cpython"
     # via
     #   -r requirements/lint.in
     #   -r requirements/test-common.in

requirements/dev.txt

@@ -107,7 +107,7 @@ imagesize==2.0.0
     # via sphinx
 iniconfig==2.3.0
     # via pytest
-isal==1.7.2 ; python_version < "3.14"
+isal==1.7.2 ; python_version < "3.14" and implementation_name == "cpython"
     # via
     #   -r requirements/lint.in
     #   -r requirements/test-common.in

requirements/test-common.in

@@ -1,7 +1,7 @@
 blockbuster
 coverage
 freezegun
-isal; python_version < "3.14" # no wheel for 3.14
+isal; python_version < "3.14" and implementation_name == "cpython" # no wheel for 3.14, no PyPy wheel for 1.8.0+
 mypy; implementation_name == "cpython"
 pkgconfig
 proxy.py >= 2.4.4rc5

requirements/test-common.txt

@@ -50,7 +50,7 @@ idna==3.15
     #   yarl
 iniconfig==2.3.0
     # via pytest
-isal==1.8.0 ; python_version < "3.14"
+isal==1.8.0 ; python_version < "3.14" and implementation_name == "cpython"
     # via -r requirements/test-common.in
 librt==0.11.0
     # via mypy

requirements/test-ft.txt

@@ -67,7 +67,7 @@ idna==3.15
     #   yarl
 iniconfig==2.3.0
     # via pytest
-isal==1.8.0 ; python_version < "3.14"
+isal==1.8.0 ; python_version < "3.14" and implementation_name == "cpython"
     # via -r requirements/test-common.in
 librt==0.11.0
     # via mypy

requirements/test.txt

@@ -67,7 +67,7 @@ idna==3.15
     #   yarl
 iniconfig==2.3.0
     # via pytest
-isal==1.7.2 ; python_version < "3.14"
+isal==1.7.2 ; python_version < "3.14" and implementation_name == "cpython"
     # via -r requirements/test-common.in
 librt==0.11.0
     # via mypy