Add test for save/load state snapshot in swarm (#323)

Signed-off-by: Yuji Oshima <yuji.oshima0x3fd@gmail.com>

pkg/store/swarm/swarm_test.go

@@ -1,27 +1,72 @@
 package swarm
 
 import (
-	"testing"
-
+	docker_types "github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/swarm"
+	mock_client "github.com/docker/infrakit/pkg/mock/docker/docker/client"
+	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/require"
+	"testing"
 )
 
-func TestEncodeDecode(t *testing.T) {
+var input = map[string]interface{}{
+	"Group": map[string]interface{}{
+		"managers": map[string]interface{}{
+			"Instance":   "foo",
+			"Flavor":     "bar",
+			"Allocation": []interface{}{"a", "b", "c"},
+		},
+		"workers": map[string]interface{}{
+			"Instance": "bar",
+			"Flavor":   "baz",
+		},
+	},
+}
+
+const nodeID = "my-node-id"
+const encodedInput = "eJx0jkEKwlAMRPc9xTBrT/B3bhTPIC7STxXx+yNpVVB6dymSGhE3gTeTmeTZAADXptcLE94I8CxVDp31QQO4LEWzDEetTNjOOkDhImL7jZkz7T4GV0VuakxgKxYS3NR+kJq7ydqrenr0Fd7VTj/fxbrHv7rpktc1PsdXAAAA//8CYjjK"
+
+var infoResponse = docker_types.Info{InfoBase: &docker_types.InfoBase{Swarm: swarm.Info{NodeID: nodeID}}}
 
-	input := map[string]interface{}{
-		"Group": map[string]interface{}{
-			"managers": map[string]interface{}{
-				"Instance":   "foo",
-				"Flavor":     "bar",
-				"Allocation": []interface{}{"a", "b", "c"},
-			},
-			"workers": map[string]interface{}{
-				"Instance": "bar",
-				"Flavor":   "baz",
-			},
+func TestSaveLoadSnapshot(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+	client := mock_client.NewMockAPIClient(ctrl)
+	snapshot, err := NewSnapshot(client)
+
+	swarmInfo := swarm.Swarm{}
+	expectedSpec := swarm.Spec{
+		Annotations: swarm.Annotations{
+			Labels: map[string]string{SwarmLabel: encodedInput},
 		},
 	}
+	//Test first time save Snapshot (nil -> expectedSpec)
 
+	client.EXPECT().SwarmUpdate(gomock.Any(), swarm.Version{Index: uint64(0)}, expectedSpec, swarm.UpdateFlags{RotateWorkerToken: false, RotateManagerToken: false, RotateManagerUnlockKey: false}).Return(nil)
+	client.EXPECT().SwarmInspect(gomock.Any()).Return(swarmInfo, nil)
+	err = snapshot.Save(input)
+	require.NoError(t, err)
+
+	//Test update Snapshot(unexpectedSpec -> expectedSpec)
+	unexpectedSpec := swarm.Spec{
+		Annotations: swarm.Annotations{
+			Labels: map[string]string{SwarmLabel: "dummy"},
+		},
+	}
+	swarmInfo.Spec = unexpectedSpec
+	client.EXPECT().SwarmUpdate(gomock.Any(), swarm.Version{Index: uint64(0)}, expectedSpec, swarm.UpdateFlags{RotateWorkerToken: false, RotateManagerToken: false, RotateManagerUnlockKey: false}).Return(nil)
+	client.EXPECT().SwarmInspect(gomock.Any()).Return(swarmInfo, nil)
+	err = snapshot.Save(input)
+	require.NoError(t, err)
+	//Test Load Snapshot
+	client.EXPECT().SwarmInspect(gomock.Any()).Return(swarmInfo, nil)
+	output := map[string]interface{}{}
+	err = snapshot.Load(&output)
+	require.NoError(t, err)
+	require.Equal(t, input, output)
+}
+
+func TestEncodeDecode(t *testing.T) {
 	encoded, err := encode(input)
 	require.NoError(t, err)
 	t.Log("encoded=", encoded)