test(ci-broker.md): verify event filter And

Signed-off-by: Lars Wirzenius <liw@liw.fi>

ci-broker.md

@@ -1048,6 +1048,43 @@ triggers:
 ~~~
 
 
+## Filter predicate `And`
+
+_Want:_ We can allow a combination of events if they are all allowed
+individually.
+
+_Why:_ This is for consistency.
+
+~~~scenario
+given a Radicle node, with CI configured with broker.yaml and adapter dummy.sh
+given a Git repository xyzzy in the Radicle node
+
+given file config.yaml from filter-and.yaml
+
+when I run cibtool --db ci-broker.db event add --repo xyzzy --ref main --commit HEAD --kind branch-deleted
+when I run cibtool --db ci-broker.db event add --repo xyzzy --ref oksa --commit HEAD --kind branch-created
+
+when I run ./env.sh cib --config config.yaml queued
+
+when I run cibtool --db ci-broker.db run list --json
+then stdout contains "main"
+then stdout contains "oksa"
+~~~
+
+~~~{#filter-and.yaml .file .json}
+db: ci-broker.db
+adapters:
+  default:
+    command: ./adapter.sh
+triggers:
+  - adapter: default
+    filters:
+      - !And
+        - !Allow
+        - !Allow
+~~~
+
+
 # Acceptance criteria for test tooling
 
 The event synthesizer is a helper to feed the CI broker node events in