1 files changed, 10 insertions, 0 deletions
diff --git a/packages/taler-harness/src/integrationtests/test-merchant-instances.ts b/packages/taler-harness/src/integrationtests/test-merchant-instances.ts
index 167c54cb4..54205e9f2 100644
--- a/packages/taler-harness/src/integrationtests/test-merchant-instances.ts
+++ b/packages/taler-harness/src/integrationtests/test-merchant-instances.ts
@@ -86,6 +86,16 @@ export async function runMerchantInstancesTest(t: GlobalTestState) {
     },
   });
 
+  // Add it again, should be idempotent
+  await merchant.addInstanceWithWireAccount({
+    id: "default",
+    name: "Default Instance",
+    paytoUris: [getPayto("merchant-default")],
+    auth: {
+      method: "external",
+    },
+  });
+
   // Add an instance, no auth!
   await merchant.addInstanceWithWireAccount({
     id: "myinst",