Refactor pkg packages

Signed-off-by: Maksym Pavlenko <pavlenko.maksym@gmail.com>

pkg/cri/util/strings_test.go

@@ -0,0 +1,59 @@
+/*
+   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 util
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestInStringSlice(t *testing.T) {
+	ss := []string{"ABC", "def", "ghi"}
+
+	assert.True(t, InStringSlice(ss, "ABC"))
+	assert.True(t, InStringSlice(ss, "abc"))
+	assert.True(t, InStringSlice(ss, "def"))
+	assert.True(t, InStringSlice(ss, "DEF"))
+	assert.False(t, InStringSlice(ss, "hij"))
+	assert.False(t, InStringSlice(ss, "HIJ"))
+	assert.False(t, InStringSlice(nil, "HIJ"))
+}
+
+func TestSubtractStringSlice(t *testing.T) {
+	ss := []string{"ABC", "def", "ghi"}
+
+	assert.Equal(t, []string{"def", "ghi"}, SubtractStringSlice(ss, "abc"))
+	assert.Equal(t, []string{"def", "ghi"}, SubtractStringSlice(ss, "ABC"))
+	assert.Equal(t, []string{"ABC", "ghi"}, SubtractStringSlice(ss, "def"))
+	assert.Equal(t, []string{"ABC", "ghi"}, SubtractStringSlice(ss, "DEF"))
+	assert.Equal(t, []string{"ABC", "def", "ghi"}, SubtractStringSlice(ss, "hij"))
+	assert.Equal(t, []string{"ABC", "def", "ghi"}, SubtractStringSlice(ss, "HIJ"))
+	assert.Empty(t, SubtractStringSlice(nil, "hij"))
+	assert.Empty(t, SubtractStringSlice([]string{}, "hij"))
+}
+
+func TestMergeStringSlices(t *testing.T) {
+	s1 := []string{"abc", "def", "ghi"}
+	s2 := []string{"def", "jkl", "mno"}
+	expect := []string{"abc", "def", "ghi", "jkl", "mno"}
+	result := MergeStringSlices(s1, s2)
+	assert.Len(t, result, len(expect))
+	for _, s := range expect {
+		assert.Contains(t, result, s)
+	}
+}