checkpoint: add unit test for checkpoint ls

add unit test for checkpoint ls.

Signed-off-by: ChengyuZhu6 <[email protected]>

Author: ChengyuZhu6

cmd/nerdctl/checkpoint/checkpoint_list_linux_test.go

@@ -0,0 +1,107 @@
+//go:build linux
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package checkpoint
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/containerd/nerdctl/mod/tigron/expect"
+	"github.com/containerd/nerdctl/mod/tigron/require"
+	"github.com/containerd/nerdctl/mod/tigron/test"
+
+	"github.com/containerd/nerdctl/v2/pkg/testutil"
+	"github.com/containerd/nerdctl/v2/pkg/testutil/nerdtest"
+)
+
+func TestCheckpointListErrors(t *testing.T) {
+	testCase := nerdtest.Setup()
+
+	testCase.Require = require.All(
+		require.Not(nerdtest.Rootless),
+		// Docker version 28.x has a known regression that breaks Checkpoint/Restore functionality.
+		// The issue is tracked in the moby/moby project as https://github.com/moby/moby/issues/50750.
+		require.Not(nerdtest.Docker),
+	)
+
+	testCase.SubTests = []*test.Case{
+		{
+			Description: "too-few-arguments",
+			Command:     test.Command("checkpoint", "list"),
+			Expected: func(data test.Data, helpers test.Helpers) *test.Expected {
+				return &test.Expected{ExitCode: 1}
+			},
+		},
+		{
+			Description: "too-many-arguments",
+			Command:     test.Command("checkpoint", "list", "too", "many", "arguments"),
+			Expected: func(data test.Data, helpers test.Helpers) *test.Expected {
+				return &test.Expected{ExitCode: 1}
+			},
+		},
+		{
+			Description: "invalid-container-id",
+			Command:     test.Command("checkpoint", "list", "no-such-container"),
+			Expected: func(data test.Data, helpers test.Helpers) *test.Expected {
+				return &test.Expected{
+					ExitCode: 1,
+					Errors:   []error{errors.New("error list checkpoint for container: no-such-container")},
+				}
+			},
+		},
+	}
+
+	testCase.Run(t)
+}
+
+func TestCheckpointList(t *testing.T) {
+	const checkpointName = "checkpoint-list"
+
+	testCase := nerdtest.Setup()
+	testCase.Require = require.All(
+		require.Not(nerdtest.Rootless),
+		// Docker version 28.x has a known regression that breaks Checkpoint/Restore functionality.
+		// The issue is tracked in the moby/moby project as https://github.com/moby/moby/issues/50750.
+		require.Not(nerdtest.Docker),
+	)
+
+	testCase.Setup = func(data test.Data, helpers test.Helpers) {
+		helpers.Ensure("run", "-d", "--name", data.Identifier(), testutil.CommonImage, "sleep", "infinity")
+		helpers.Ensure("checkpoint", "create", data.Identifier(), checkpointName)
+	}
+
+	testCase.Cleanup = func(data test.Data, helpers test.Helpers) {
+		helpers.Anyhow("rm", "-f", data.Identifier())
+		helpers.Anyhow("rmi", "-f", testutil.CommonImage)
+	}
+
+	testCase.Command = func(data test.Data, helpers test.Helpers) test.TestableCommand {
+		return helpers.Command("checkpoint", "list", data.Identifier())
+	}
+
+	testCase.Expected = func(data test.Data, helpers test.Helpers) *test.Expected {
+		return &test.Expected{
+			ExitCode: 0,
+			// First line is header, second should include the checkpoint name
+			Output: expect.Contains("CHECKPOINT NAME\n" + checkpointName + "\n"),
+		}
+	}
+
+	testCase.Run(t)
+}