test: clean up reward-hacking backend tests (#5563)

controller/model_list_test.go

@@ -220,10 +220,12 @@ func TestListModelsTokenLimitIncludesTieredBillingModel(t *testing.T) {
 		"zz-token-tiered-visible-model":    `tier("base", p * 1 + c * 2)`,
 		"zz-token-tiered-empty-expr-model": "",
 	})
+	setupModelListControllerTestDB(t)
 
 	recorder := httptest.NewRecorder()
 	ctx, _ := gin.CreateTestContext(recorder)
 	ctx.Request = httptest.NewRequest(http.MethodGet, "/v1/models", nil)
+	common.SetContextKey(ctx, constant.ContextKeyUserGroup, "default")
 	common.SetContextKey(ctx, constant.ContextKeyTokenModelLimitEnabled, true)
 	common.SetContextKey(ctx, constant.ContextKeyTokenModelLimit, map[string]bool{
 		"zz-token-tiered-visible-model":      true,