Move snapshots/devmapper to plugins/snapshots/devmapper

Signed-off-by: Derek McGowan <derek@mcg.dev>

plugins/snapshots/devmapper/config_test.go

@@ -0,0 +1,101 @@
+//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 devmapper
+
+import (
+	"os"
+	"testing"
+
+	"github.com/pelletier/go-toml/v2"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestLoadConfig(t *testing.T) {
+	expected := Config{
+		RootPath:      "/tmp",
+		PoolName:      "test",
+		BaseImageSize: "128Mb",
+	}
+
+	file, err := os.CreateTemp("", "devmapper-config-")
+	assert.NoError(t, err)
+
+	encoder := toml.NewEncoder(file)
+	err = encoder.Encode(&expected)
+	assert.NoError(t, err)
+
+	defer func() {
+		err := file.Close()
+		assert.NoError(t, err)
+
+		err = os.Remove(file.Name())
+		assert.NoError(t, err)
+	}()
+
+	loaded, err := LoadConfig(file.Name())
+	assert.NoError(t, err)
+
+	assert.Equal(t, loaded.RootPath, expected.RootPath)
+	assert.Equal(t, loaded.PoolName, expected.PoolName)
+	assert.Equal(t, loaded.BaseImageSize, expected.BaseImageSize)
+	assert.True(t, loaded.BaseImageSizeBytes == 128*1024*1024)
+}
+
+func TestLoadConfigInvalidPath(t *testing.T) {
+	_, err := LoadConfig("")
+	assert.Equal(t, os.ErrNotExist, err)
+
+	_, err = LoadConfig("/dev/null")
+	assert.NotNil(t, err)
+}
+
+func TestParseInvalidData(t *testing.T) {
+	config := Config{
+		BaseImageSize: "y",
+	}
+
+	err := config.parse()
+	assert.Error(t, err, "failed to parse base image size: 'y': invalid size: 'y'")
+}
+
+func TestFieldValidation(t *testing.T) {
+	config := &Config{}
+	err := config.Validate()
+	assert.NotNil(t, err)
+
+	multErr := err.(interface{ Unwrap() []error }).Unwrap()
+	assert.Len(t, multErr, 4)
+
+	assert.NotNil(t, multErr[0], "pool_name is empty")
+	assert.NotNil(t, multErr[1], "root_path is empty")
+	assert.NotNil(t, multErr[2], "base_image_size is empty")
+	assert.NotNil(t, multErr[3], "filesystem type cannot be empty")
+}
+
+func TestExistingPoolFieldValidation(t *testing.T) {
+	config := &Config{
+		PoolName:       "test",
+		RootPath:       "test",
+		BaseImageSize:  "10mb",
+		FileSystemType: "ext4",
+	}
+
+	err := config.Validate()
+	assert.NoError(t, err)
+}