[#352] container: Implement iterators over attributes

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

container/iterators_test.go

@@ -0,0 +1,95 @@
+package container_test
+
+import (
+	"testing"
+
+	containerAPI "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/api/container"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container"
+	"github.com/stretchr/testify/require"
+)
+
+func TestContainer_Attributes(t *testing.T) {
+	t.Run("empty", func(t *testing.T) {
+		var n container.Container
+		t.Run("attributes", func(t *testing.T) {
+			for range n.Attributes() {
+				t.Fatalf("handler is called, but it shouldn't")
+			}
+		})
+		t.Run("user attributes", func(t *testing.T) {
+			for range n.UserAttributes() {
+				t.Fatalf("handler is called, but it shouldn't")
+			}
+		})
+	})
+
+	var n container.Container
+	n.SetAttribute(containerAPI.SysAttributeName, "myname")
+	n.SetAttribute("key1", "value1")
+	n.SetAttribute("key2", "value2")
+	n.SetAttribute(containerAPI.SysAttributeZone, "test")
+
+	t.Run("break", func(t *testing.T) {
+		t.Run("attributes", func(t *testing.T) {
+			var res [][2]string
+			for key, value := range n.Attributes() {
+				if key == "key2" {
+					break
+				}
+				res = append(res, [2]string{key, value})
+			}
+			require.Equal(t, [][2]string{{containerAPI.SysAttributeName, "myname"}, {"key1", "value1"}}, res)
+		})
+		t.Run("user attributes", func(t *testing.T) {
+			var res [][2]string
+			for key, value := range n.UserAttributes() {
+				if key == "key2" {
+					break
+				}
+				res = append(res, [2]string{key, value})
+			}
+			require.Equal(t, [][2]string{{"key1", "value1"}}, res)
+		})
+	})
+	t.Run("continue", func(t *testing.T) {
+		t.Run("attributes", func(t *testing.T) {
+			var res [][2]string
+			for key, value := range n.Attributes() {
+				if key == "key2" {
+					continue
+				}
+				res = append(res, [2]string{key, value})
+			}
+			require.Equal(t, [][2]string{{containerAPI.SysAttributeName, "myname"}, {"key1", "value1"}, {containerAPI.SysAttributeZone, "test"}}, res)
+		})
+		t.Run("user attributes", func(t *testing.T) {
+			var res [][2]string
+			for key, value := range n.UserAttributes() {
+				if key == "key2" {
+					continue
+				}
+				res = append(res, [2]string{key, value})
+			}
+			require.Equal(t, [][2]string{{"key1", "value1"}}, res)
+		})
+	})
+	t.Run("attributes", func(t *testing.T) {
+		var res [][2]string
+		for key, value := range n.Attributes() {
+			res = append(res, [2]string{key, value})
+		}
+		require.Equal(t, [][2]string{
+			{containerAPI.SysAttributeName, "myname"},
+			{"key1", "value1"},
+			{"key2", "value2"},
+			{containerAPI.SysAttributeZone, "test"},
+		}, res)
+	})
+	t.Run("user attributes", func(t *testing.T) {
+		var res [][2]string
+		for key, value := range n.UserAttributes() {
+			res = append(res, [2]string{key, value})
+		}
+		require.Equal(t, [][2]string{{"key1", "value1"}, {"key2", "value2"}}, res)
+	})
+}