in more tests, after closing accounts, check the last reference is indeed gone

webmail/api_test.go

@@ -66,6 +66,7 @@ func TestAPI(t *testing.T) {
 	defer func() {
 		err := acc.Close()
 		pkglog.Check(err, "closing account")
+		acc.CheckClosed()
 	}()
 
 	var zerom store.Message

webmail/view_test.go

@@ -39,6 +39,7 @@ func TestView(t *testing.T) {
 	defer func() {
 		err := acc.Close()
 		pkglog.Check(err, "closing account")
+		acc.CheckClosed()
 	}()
 
 	api := Webmail{maxMessageSize: 1024 * 1024, cookiePath: "/"}

webmail/webmail_test.go

@@ -301,6 +301,7 @@ func TestWebmail(t *testing.T) {
 	defer func() {
 		err := acc.Close()
 		pkglog.Check(err, "closing account")
+		acc.CheckClosed()
 	}()
 
 	api := Webmail{maxMessageSize: 1024 * 1024, cookiePath: "/webmail/"}