Make arkg tests skippable

Author: dainnilsson

.github/workflows/build.yml

@@ -34,10 +34,14 @@ jobs:
           python-version: ${{ matrix.python }}
           architecture: ${{ matrix.architecture }}
 
+      - name: Install system dependencies
+        if: "startsWith(matrix.os, 'ubuntu')"
+        run: sudo apt-get install -qq libpcsclite-dev
+
       - name: Install python dependencies
         run: |
           python -m pip install --upgrade pip setuptools poetry
-          poetry update
+          poetry install --all-extras
 
       - name: Run pre-commit
         if: "!startsWith(matrix.python, 'pypy')"
@@ -86,9 +90,10 @@ jobs:
 
       - name: Install python dependencies
         run: |
+          sudo apt-get install -qq libpcsclite-dev
           python -m pip install --upgrade pip
           python -m pip install poetry
-          poetry install
+          poetry install --all-extras
 
       - name: Build sphinx documentation
         run: poetry run make -C docs/ html

tests/test_arkg.py

@@ -1,9 +1,18 @@
 # flake8: noqa ignore lines too long
-from fido2.arkg import ARKG_P256
+
 
 import pytest
 
 
+@pytest.fixture(autouse=True, scope="module")
+def preconditions():
+    global ARKG_P256
+    try:
+        from fido2.arkg import ARKG_P256
+    except ImportError:
+        pytest.skip("ecdsa is not installed")
+
+
 TEST_VECTORS = [
     {
         "ctx": b"ARKG-P256.test vectors",