Write a failing test

tests.yaml

@@ -311,6 +311,22 @@ tests:
       retcode: 0
       partstdout: "checking IP : 2001:4860:4860::8888\nConnecting to 2001:4860:4860::8888 ..."
 
+    - name: '[dot][check] Verify that all IPs are tried even when one is failing'
+      exe: './homer.py'
+      timeout: 6
+      markers:
+          - 'dot'
+          - 'check'
+      args:
+          - '-v'
+          - '-k'
+          - '--dot'
+          - '--check'
+          - 'brok.sources.org'
+          - 'tm'
+      retcode: 1
+      partstdout: "(3/3) checking IP"
+
     - name: '[doh][check] Test all the IPs, force IPv4'
       exe: './homer.py'
       markers: