nightly vm test: full single-host swarm setup up to the meta flake

hive-meta-flake/src/lib.rs

@@ -583,6 +583,41 @@ mod tests {
         }
     }
 
+    /// `testdata/meta-flake-swarm.nix.in` is the flake `nix/vm-tests/full-setup.nix`
+    /// evaluates and serves: two archetype agents, the seven forwarded values a
+    /// single-host swarm without a display name sets, each as `@<NAME>@`, and
+    /// `@HYPERHIVE_URL@` where the pin goes. It must be what [`render_flake`]
+    /// renders for them.
+    #[test]
+    fn the_full_setup_fixture_is_what_render_flake_renders() {
+        let archetype = || {
+            Some(ArchetypeRef {
+                source: "hyperhive".to_owned(),
+                name: "reviewer".to_owned(),
+            })
+        };
+        let vars: Vec<(&'static str, String)> = FORWARDED_VARS
+            .iter()
+            .filter(|name| **name != "HYPERHIVE_SWARM_NAME")
+            .map(|&name| (name, format!("@{name}@")))
+            .collect();
+        let flake = render_flake(
+            "@HYPERHIVE_URL@",
+            &[
+                spec("iris", archetype(), None),
+                spec("ruth", archetype(), None),
+            ],
+            &vars,
+            false,
+        )
+        .unwrap();
+        assert_eq!(
+            flake,
+            include_str!("../testdata/meta-flake-swarm.nix.in"),
+            "update the fixture to the rendered flake"
+        );
+    }
+
     #[test]
     fn a_rendered_flake_names_the_commit_each_input_is_pinned_to() {
         let flake = rendered();