feat(tests): add comprehensive test suite for backend functionality, including database, configuration, and telemetry utilities

tests/backend/test_config_manager.py

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+import os
+import tempfile
+import pytest
+from meshchatx.src.backend.database import Database
+from meshchatx.src.backend.config_manager import ConfigManager
+
+
+@pytest.fixture
+def db():
+    fd, path = tempfile.mkstemp()
+    os.close(fd)
+    database = Database(path)
+    database.initialize()
+    yield database
+    database.close()
+    if os.path.exists(path):
+        os.remove(path)
+
+
+def test_config_manager_get_default(db):
+    config = ConfigManager(db)
+    assert config.display_name.get() == "Anonymous Peer"
+    assert config.theme.get() == "light"
+    assert config.lxmf_inbound_stamp_cost.get() == 8
+
+
+def test_config_manager_set_get(db):
+    config = ConfigManager(db)
+    config.display_name.set("Test User")
+    assert config.display_name.get() == "Test User"
+
+    config.lxmf_inbound_stamp_cost.set(20)
+    assert config.lxmf_inbound_stamp_cost.get() == 20
+
+    config.auto_announce_enabled.set(True)
+    assert config.auto_announce_enabled.get() is True
+
+
+def test_config_manager_persistence(db):
+    config = ConfigManager(db)
+    config.display_name.set("Persistent User")
+
+    # New manager instance with same DB
+    config2 = ConfigManager(db)
+    assert config2.display_name.get() == "Persistent User"
+
+
+def test_config_manager_type_safety(db):
+    config = ConfigManager(db)
+
+    # IntConfig
+    config.lxmf_inbound_stamp_cost.set(
+        "15"
+    )  # Should handle string to int if implementation allows or just store it
+    # Looking at implementation might be better, but let's test basic set/get
+    config.lxmf_inbound_stamp_cost.set(15)
+    assert isinstance(config.lxmf_inbound_stamp_cost.get(), int)
+    assert config.lxmf_inbound_stamp_cost.get() == 15
+
+    # BoolConfig
+    config.auto_announce_enabled.set(True)
+    assert config.auto_announce_enabled.get() is True
+    config.auto_announce_enabled.set(False)
+    assert config.auto_announce_enabled.get() is False