brokerd: config, [gateway] socket for Mattermost approvals

crates/brokerd/tests/config_gateway.rs

@@ -0,0 +1,43 @@
+//! `[gateway]` in `brokerd.toml`: absent means Mattermost approvals are off; an empty socket is
+//! the default under `home` (M4b spec, section 3). Do not edit.
+
+use std::path::PathBuf;
+
+use brokerd::config::Config;
+
+fn parse(text: &str) -> Config {
+    Config::parse(&format!("[paths]\nhome = \"/srv/bx\"\n{text}")).unwrap()
+}
+
+#[test]
+fn without_the_section_approvals_stay_in_bxctl() {
+    let config = parse("");
+    assert_eq!(config.gateway, None);
+    assert_eq!(config.gateway_socket(), None);
+}
+
+#[test]
+fn an_empty_section_or_socket_is_the_default() {
+    let default = Some(PathBuf::from("/srv/bx/run/gateway/gateway.sock"));
+    assert_eq!(parse("[gateway]\n").gateway_socket(), default);
+    assert_eq!(
+        parse("[gateway]\nsocket = \"\"\n").gateway_socket(),
+        default
+    );
+}
+
+#[test]
+fn a_socket_path_is_used_as_given() {
+    let config = parse("[gateway]\nsocket = \"/run/bx/gw.sock\"\n");
+    assert_eq!(
+        config.gateway_socket(),
+        Some(PathBuf::from("/run/bx/gw.sock"))
+    );
+}
+
+#[test]
+fn unknown_keys_are_errors() {
+    assert!(Config::parse("[gateway]\nsockets = \"/x\"\n").is_err());
+    assert!(Config::parse("[gateway]\nsocket = \"/x\"\nenabled = true\n").is_err());
+    assert!(Config::parse("[gatewy]\nsocket = \"/x\"\n").is_err());
+}

crates/brokerd/tests/support/rig.rs

@@ -41,6 +41,7 @@ impl Rig {
             sockets: Sockets::default(),
             approvals: Approvals { ttl_ms },
             runner: None,
+            gateway: None,
         };
         Rig {
             dir,