fix failing tests

.github/workflows/tests.yml

@@ -67,7 +67,7 @@ jobs:
           pip freeze
           pip check
 
-      - name: Run tests with coverage
+      - name: Run tests on MacOS
         if: ${{ startsWith(runner.os, 'macos')  }}
         shell: bash -l {0}
         run: |
@@ -76,15 +76,14 @@ jobs:
           pip install -U websockets
           python -m pytest --cov nbconvert -vv
 
-      - name: Run tests on pypy and Windows
+      - name: Run tests on Linux
         if: ${{ startsWith(runner.os, 'linux') }}
         shell: bash -l {0}
         run: |
           conda activate nbconvert
           # See https://github.com/pyppeteer/pyppeteer/pull/321
           pip install -U websockets
-          #python -m pytest -vv
-          xvfb-run --auto-servernum `which coverage` run -m pytest -vv
+          NBFORMAT_VALIDATOR=jsonschema xvfb-run --auto-servernum `which coverage` run -m pytest -vv
 
       - name: Run tests on pypy and Windows
         if: ${{ startsWith(runner.os, 'Windows') }}
@@ -136,6 +135,7 @@ jobs:
         uses: jupyterlab/maintainer-tools/.github/actions/install-minimums@v1
       - name: Run the unit tests
         run: |
+          export NBFORMAT_VALIDATOR=jsonschema
           pytest -vv -W default || pytest -vv -W default --lf
 
   test_prereleases:
@@ -158,7 +158,7 @@ jobs:
         run: |
           pip install jupyter_client@https://github.com/blink1073/jupyter_client/archive/refs/heads/synchronous_managers.zip
           pip install nbclient==0.7.0
-          pytest -vv || pytest -vv --lf
+          pytest -vv -W default || pytest -vv -W default --lf
 
   make_sdist:
     name: Make SDist

nbconvert/exporters/tests/test_latex.py

@@ -160,6 +160,7 @@ def test_svg(self):
         Can a LatexExporter export when it recieves raw binary strings form svg?
         """
         filename = os.path.join(current_dir, "files", "svg.ipynb")
+
         (output, resources) = LatexExporter().from_filename(filename)
         assert len(output) > 0
 

nbconvert/exporters/tests/test_rst.py

@@ -40,11 +40,13 @@ def test_empty_code_cell(self):
         with open(nbname, encoding="utf8") as f:
             nb = nbformat.read(f, 4)
 
+        nb = v4.upgrade(nb)
         exporter = self.exporter_class()
 
         (output, resources) = exporter.from_notebook_node(nb)
         # add an empty code cell
         nb.cells.append(v4.new_code_cell(source=""))
+
         (output2, resources) = exporter.from_notebook_node(nb)
         # adding an empty code cell shouldn't change output
         self.assertEqual(output.strip(), output2.strip())

nbconvert/preprocessors/svg2pdf.py

@@ -148,6 +148,6 @@ def convert_figure(self, data_format, data):
             if os.path.isfile(output_filename):
                 with open(output_filename, "rb") as f:
                     # PDF is a nb supported binary, data type, so base64 encode.
-                    return base64.encodebytes(f.read())
+                    return base64.encodebytes(f.read()).decode("utf-8")
             else:
                 raise TypeError("Inkscape svg to pdf conversion failed")