Test that a settings send moves no ungated build waiting on its machine (issue 641, ADR 0344 §3)

cmd/mesh-controller/settings_walk_test.go

@@ -413,6 +413,18 @@ func TestASettingsWalkSendsTheLayerAloneEveryBuildKept(t *testing.T) {
 	if kept, _ := recordedKept(ctx, w.open, "anchor"); kept["app"] != "" {
 		t.Fatalf("an ordinary send keeps a rolled-out build: %v", kept)
 	}
+	// And so the ungated build waiting on anchor is no move of the settings send's: nothing for a gate to see.
+	f, err := readMoveFacts(ctx, inv)
+	if err != nil {
+		t.Fatal(err)
+	}
+	waiting, _ := machineMoves(ctx, w.open, f, "anchor", false)
+	if len(waiting) != 1 || waiting[0].Module != "app" {
+		t.Fatalf("anchor waits for %+v, want app's c2", waiting)
+	}
+	if moved, err := withoutKept(keepingBuildsForSettings(ctx, "anchor"), w.open, "anchor", waiting); err != nil || len(moved) != 0 {
+		t.Fatalf("a settings send to anchor would move %+v (%v)", moved, err)
+	}
 }
 
 // A machine whose send would move a running module's data stops the walk there, failed and said with the push that