Test the returning socket by a real restart of the stand-in node-engine

modules/mesh-provisioner-client/cmd/mesh-provisioner-client/client_test.go

@@ -751,17 +751,17 @@ func TestNatsAFillThatFailedForWantOfTheSocketIsTriedWhenTheSocketReturns(t *tes
 
 func TestNatsAReturningSocketAsksNothingOfAModuleThatWasPlaced(t *testing.T) {
 	b := startBus(t)
-	e := startEngine(t, map[string]string{dunstrc: "owned"})
+	e := newEngine(t, map[string]string{dunstrc: "owned"})
+	stop := e.listen(t)
 	b.config(t, "dunst", "font-size", "13")
 	b.assign(t, "dunst", dunst(t))
-	c, _ := aClient(t, b, e, t.TempDir())
+	aClient(t, b, e, t.TempDir())
 	eventually(t, "dunstrc is filled", func() bool { return strings.Contains(e.read(t, dunstrc), "Monospace 13") })
 	_, before := e.counts(dunstrc)
 
-	// A socket-up wake with nothing unplaced, then a later change as the proof the loop has run past it.
-	up := make(chan struct{}, 1)
-	c.SocketUp = up
-	_ = up
+	// The node-engine replaces itself: the socket goes and returns, and a later change proves the loop ran past it.
+	stop()
+	e.listen(t)
 	b.config(t, "dunst", "font-size", "15")
 	eventually(t, "the change is written", func() bool { return strings.Contains(e.read(t, dunstrc), "Monospace 15") })
 	_, after := e.counts(dunstrc)