test: cover operation contect error paths

tests/test_operation_context.py

@@ -0,0 +1,30 @@
+import pytest
+
+import skywipe.operations as operations
+
+
+def test_operation_context_raises_on_auth_error(monkeypatch):
+    class FakeAuth:
+        def login(self):
+            raise ValueError("bad auth")
+
+    monkeypatch.setattr(operations, "Auth", FakeAuth)
+
+    with pytest.raises(ValueError, match="bad auth"):
+        operations.OperationContext()
+
+
+def test_operation_context_raises_on_config_error(monkeypatch):
+    class FakeClient:
+        class Me:
+            did = "did:plc:fake"
+
+        me = Me()
+
+    def fake_load(self):
+        raise ValueError("bad config")
+
+    monkeypatch.setattr(operations.Configuration, "load", fake_load)
+
+    with pytest.raises(ValueError, match="bad config"):
+        operations.OperationContext(client=FakeClient())