Extract reusable device protocols, ports and logic analyzers from SETGUI

python/tests/test_shared_library_boundary.py

@@ -0,0 +1,38 @@
+"""Shared libraries must import without the desktop application or Qt."""
+import os
+from pathlib import Path
+import subprocess
+import sys
+import tempfile
+import unittest
+
+
+class LibraryBoundaryTests(unittest.TestCase):
+    def test_cores_import_with_gui_and_qt_blocked(self):
+        root = Path(__file__).resolve().parents[1]
+        code = '''
+import importlib, importlib.abc, pkgutil, sys
+class BlockGui(importlib.abc.MetaPathFinder):
+    def find_spec(self, fullname, path=None, target=None):
+        if fullname.split('.')[0] in ('gui_desktop', 'PySide6', 'PySide2'):
+            raise ImportError('Application dependency in shared core: ' + fullname)
+sys.meta_path.insert(0, BlockGui())
+for name in ('logic_analyzer', 'set_devices'):
+    package = importlib.import_module(name)
+    for module in pkgutil.walk_packages(package.__path__, name + '.'):
+        if '.qt_ports' not in module.name:
+            importlib.import_module(module.name)
+assert 'gui_desktop' not in sys.modules
+'''
+        env = dict(os.environ, PYTHONPATH=str(root))
+        with tempfile.TemporaryDirectory() as directory:
+            result = subprocess.run([sys.executable, '-c', code], cwd=directory, env=env,
+                                    capture_output=True, text=True, timeout=30)
+        self.assertEqual(result.returncode, 0, result.stderr)
+
+    def test_no_reverse_imports_in_sources(self):
+        root = Path(__file__).resolve().parents[1]
+        for name in ('logic_analyzer', 'set_devices', 'altera_logic'):
+            for path in (root / name).rglob('*.py'):
+                text = path.read_text(encoding='utf-8')
+                self.assertNotIn('gui_desktop', text, str(path))