diff --git a/services/app_test.go b/services/app_test.go
new file mode 100644
index 00000000..c26aa78b
--- /dev/null
+++ b/services/app_test.go
@@ -0,0 +1,87 @@
+package services
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	mackerel "github.com/mackerelio/mackerel-client-go"
+
+	"github.com/mackerelio/mkr/mackerelclient"
+)
+
+func TestServicesApp_Run(t *testing.T) {
+	testCases := []struct {
+		id       string
+		services []*mackerel.Service
+		expected string
+	}{
+		{
+			id: "default",
+			services: []*mackerel.Service{
+				&mackerel.Service{
+					Name:  "sample-service-1",
+					Memo:  "sample memo 1",
+					Roles: []string{"role1", "role2", "role3"},
+				},
+				&mackerel.Service{
+					Name:  "sample-service-2",
+					Memo:  "sample memo 2",
+					Roles: []string{"role"},
+				},
+				&mackerel.Service{
+					Name:  "sample-service-3",
+					Memo:  "",
+					Roles: []string{},
+				},
+			},
+			expected: `[
+    {
+        "name": "sample-service-1",
+        "memo": "sample memo 1",
+        "roles": [
+            "role1",
+            "role2",
+            "role3"
+        ]
+    },
+    {
+        "name": "sample-service-2",
+        "memo": "sample memo 2",
+        "roles": [
+            "role"
+        ]
+    },
+    {
+        "name": "sample-service-3",
+        "memo": "",
+        "roles": []
+    }
+]
+`,
+		},
+		{
+			id:       "no services",
+			services: []*mackerel.Service{},
+			expected: `[]
+`,
+		},
+	}
+	for _, tc := range testCases {
+		client := mackerelclient.NewMockClient(
+			mackerelclient.MockFindServices(func() ([]*mackerel.Service, error) {
+				return tc.services, nil
+			}),
+		)
+		t.Run(tc.id, func(t *testing.T) {
+			out := new(bytes.Buffer)
+			app := &servicesApp{
+				client:    client,
+				outStream: out,
+			}
+			assert.NoError(t, app.run())
+			assert.Equal(t, tc.expected, out.String())
+		})
+	}
+}