tests: Add basic tests for menu plugin

This checks basic features of kas menu, some option selection, yaml
including, rebuilding and target selection.

The UI is operated by mocking smack's GridFormHelp.runOnce and some
result evaluation functions. Injecting keys from the keyboard was not
easily possibly (if at all), thus this approach. The menu rendering is
not shown due to pytest.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

.github/workflows/next.yml

@@ -8,6 +8,8 @@ on:
 env:
   SHELLCHECK_VERSION: v0.7.1
   SHELLCHECK_SHA256: 64f17152d96d7ec261ad3086ed42d18232fcb65148b44571b564d688269d36c8
+  NEWT_VERSION: 0.52.21
+  NEWT_SHA256: 265eb46b55d7eaeb887fca7a1d51fe115658882dfe148164b6c49fccac5abb31
 
 jobs:
   perform_tests:
@@ -38,10 +40,26 @@ jobs:
           echo "$SHELLCHECK_SHA256 shellcheck-$SHELLCHECK_VERSION.linux.x86_64.tar.xz" | sha256sum -c
           tar -xJf shellcheck-$SHELLCHECK_VERSION.linux.x86_64.tar.xz
           sudo cp shellcheck-$SHELLCHECK_VERSION/shellcheck /usr/local/bin/
+      - name: Install python-newt
+        run: |
+          sudo apt-get update
+          sudo apt-get install libpopt-dev libslang2-dev
+          wget -q https://releases.pagure.org/newt/newt-$NEWT_VERSION.tar.gz
+          echo "$NEWT_SHA256 newt-$NEWT_VERSION.tar.gz" | sha256sum -c
+          tar -C /tmp -xzf newt-$NEWT_VERSION.tar.gz
+          cd /tmp/newt-$NEWT_VERSION
+          autoconf
+          ./configure --with-python=python${{ matrix.python-version }}
+          make -j $(nproc)
+          sudo make install
+          ln -s /usr/local/lib/python${{ matrix.python-version }}/site-packages/_snack.so \
+                $(python3 -c 'import site; print(site.getsitepackages()[0])')/
+          ln -s /usr/local/lib/python${{ matrix.python-version }}/site-packages/snack.py \
+                $(python3 -c 'import site; print(site.getsitepackages()[0])')/
       - name: Run tests
         run: |
           scripts/checkcode.sh .
-          pytest
+          TERM=xterm pytest
 
   deploy_containers:
     name: Build and deploy container images