Tests added.

Some bug solved.

tests/conftest.py

@@ -0,0 +1,53 @@
+import sys
+import logging
+import pytest
+from configparser import ConfigParser
+from threading import Lock, Event
+
+from appengine import Commands, AppEngineException, AEErrs
+
+
+class SampleModule(Commands):
+    """Concrete Commands subclass used across tests."""
+
+    def cmd_add(self, a, b):
+        """Add two numbers.
+
+        Args:
+            a: First number.
+            b: Second number.
+
+        Returns:
+            float: Sum of a and b.
+        """
+        return float(a) + float(b)
+
+    def cmd_raise_ae(self):
+        """Raise an AppEngineException."""
+        raise AppEngineException(AEErrs.INVALID_PARAMS, "test error")
+
+    def cmd_raise_generic(self):
+        """Raise a generic exception."""
+        raise RuntimeError("boom")
+
+
+@pytest.fixture
+def log():
+    return logging.getLogger("test")
+
+
+@pytest.fixture
+def sample_module(log):
+    m = SampleModule(None, log)
+    m.lock = Lock()
+    m.cmods = {}
+    return m
+
+
+@pytest.fixture(autouse=True)
+def clean_imported_modules():
+    """Remove dynamically imported cmds_* modules after each test."""
+    yield
+    to_remove = [k for k in sys.modules if k.startswith("cmds_")]
+    for k in to_remove:
+        del sys.modules[k]