fix other minor preexisting lint issues

Author: bgentry

internal/maintenance/job_scheduler_test.go

@@ -27,13 +27,13 @@ func TestJobScheduler(t *testing.T) {
 		notificationsByQueue map[string]int
 	}
 
-	setup := func(t *testing.T, ex riverdriver.Executor) (*JobScheduler, *testBundle) {
+	setup := func(t *testing.T, exec riverdriver.Executor) (*JobScheduler, *testBundle) {
 		t.Helper()
 
 		archetype := riverinternaltest.BaseServiceArchetype(t)
 
 		bundle := &testBundle{
-			exec:                 ex,
+			exec:                 exec,
 			notificationsByQueue: make(map[string]int),
 		}
 

internal/maintenance/periodic_job_enqueuer_test.go

@@ -2,6 +2,7 @@ package maintenance
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"sync"
 	"testing"
@@ -568,7 +569,7 @@ func TestPeriodicJobEnqueuer(t *testing.T) {
 		})
 
 		svc.Config.NotifyInsert = func(ctx context.Context, execTx riverdriver.ExecutorTx, queues []string) error {
-			return fmt.Errorf("test error")
+			return errors.New("test error")
 		}
 
 		startService(t, svc)