qa: make sure we don't let unspendable Miniscript descriptors be imported

Author: darosior

test/functional/wallet_miniscript.py

@@ -277,6 +277,18 @@ def run_test(self):
         assert not res["success"]
         assert "is not sane: witnesses without signature exist" in res["error"]["message"]
 
+        # Sanity check we wouldn't let an unspendable Miniscript descriptor in
+        res = self.ms_wo_wallet.importdescriptors(
+            [
+                {
+                    "desc": descsum_create("wsh(0)"),
+                    "active": False,
+                    "timestamp": "now",
+                }
+            ]
+        )[0]
+        assert not res["success"] and "is not satisfiable" in res["error"]["message"]
+
         # Test we can track any type of Miniscript
         for ms in MINISCRIPTS:
             self.watchonly_test(ms)