Fix tests for python2 in branch 7.x.x

.github/workflows/ci.yml

@@ -3,10 +3,12 @@ on: [push]
 jobs:
   build:
     runs-on: ubuntu-20.04
+    container:
+      image: python:2.7.18-buster
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.8, 3.7, 3.6, 2.7]
+        python-version: [3.8, 3.7, 2.7]
         plone-version: [5.2, 5.1, 4.3]
         exclude:
           - python-version: 3.6
@@ -35,14 +37,15 @@ jobs:
       # python setup
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v1
+        if: ${{ matrix.python-version != 2.7 }}
         with:
           python-version: ${{ matrix.python-version }}
 
       # python cache
       - uses: actions/cache@v1
         with:
           path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+          key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
           restore-keys: |
             ${{ runner.os }}-pip-
 

news/1721.feature

@@ -0,0 +1,2 @@
+New version pins to run tests
+[erral]

plone-4.3.x.cfg

@@ -23,3 +23,9 @@ six = 1.12.0
 
 # latest version compatible with Python 2
 plone.schema = 1.4.0
+
+# latest version compatible with Python 2
+sphinxcontrib-websupport = 1.1.2
+stdlib-list = 0.6.0
+zest.pocompile = 1.6.0
+plone.rest = 3.0.2

plone-5.1.x.cfg

@@ -15,3 +15,6 @@ pyparsing = 2.4.7
 
 # Required by plone.restapi
 six = 1.12.0
+stdlib-list = 0.6.0
+zest.pocompile= 1.6.0
+plone.rest = 3.0.2

plone-5.2.x.cfg

@@ -19,3 +19,4 @@ importlib-metadata = 2.0.0
 
 # latest version compatible with Python 2
 flake8-print = 4.0.1
+zest.pocompile= 1.6.0

src/plone/restapi/tests/test_dxfield_serializer.py

@@ -41,14 +41,20 @@ def setUp(self):
         ]
 
     def serialize(self, fieldname, value):
+        field = None
         for schema in iterSchemata(self.doc1):
             if fieldname in schema:
                 field = schema.get(fieldname)
                 break
-        dm = getMultiAdapter((self.doc1, field), IDataManager)
-        dm.set(value)
-        serializer = getMultiAdapter((field, self.doc1, self.request), IFieldSerializer)
-        return serializer()
+        if field is not None:
+            dm = getMultiAdapter((self.doc1, field), IDataManager)
+            dm.set(value)
+            serializer = getMultiAdapter(
+                (field, self.doc1, self.request), IFieldSerializer
+            )
+            return serializer()
+
+        return None
 
     def test_ascii_field_serialization_returns_unicode(self):
         value = self.serialize("test_ascii_field", "foo")