[#109] netmap: convert tests to the json format

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

netmap/json_test.go

@@ -0,0 +1,82 @@
+package netmap
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// TestCase represents collection of placement policy tests for a single node set.
+type TestCase struct {
+	Name  string     `json:"name"`
+	Nodes []NodeInfo `json:"nodes"`
+	Tests map[string]struct {
+		Policy    PlacementPolicy `json:"policy"`
+		Pivot     []byte          `json:"pivot,omitempty"`
+		Result    [][]int         `json:"result,omitempty"`
+		Error     string          `json:"error,omitempty"`
+		Placement struct {
+			Pivot  []byte
+			Result [][]int
+		} `json:"placement,omitempty"`
+	}
+}
+
+func compareNodes(t *testing.T, expected [][]int, nodes Nodes, actual []Nodes) {
+	require.Equal(t, len(expected), len(actual))
+	for i := range expected {
+		require.Equal(t, len(expected[i]), len(actual[i]))
+		for j, index := range expected[i] {
+			require.Equal(t, nodes[index], actual[i][j])
+		}
+	}
+}
+
+func TestPlacementPolicy_Interopability(t *testing.T) {
+	const testsDir = "./json_tests"
+
+	f, err := os.Open(testsDir)
+	require.NoError(t, err)
+
+	ds, err := f.ReadDir(0)
+	require.NoError(t, err)
+
+	for i := range ds {
+		bs, err := ioutil.ReadFile(filepath.Join(testsDir, ds[i].Name()))
+		require.NoError(t, err)
+
+		var tc TestCase
+		require.NoError(t, json.Unmarshal(bs, &tc), "cannot unmarshal %s", ds[i].Name())
+
+		t.Run(tc.Name, func(t *testing.T) {
+			nodes := NodesFromInfo(tc.Nodes)
+			nm, err := NewNetmap(nodes)
+			require.NoError(t, err)
+
+			for name, tt := range tc.Tests {
+				t.Run(name, func(t *testing.T) {
+					v, err := nm.GetContainerNodes(&tt.Policy, tt.Pivot)
+					if tt.Result == nil {
+						require.Error(t, err)
+						require.Contains(t, err.Error(), tt.Error)
+					} else {
+						require.NoError(t, err)
+
+						res := v.Replicas()
+						compareNodes(t, tt.Result, nodes, res)
+
+						if tt.Placement.Result != nil {
+							res, err := nm.GetPlacementVectors(v, tt.Placement.Pivot)
+							require.NoError(t, err)
+							compareNodes(t, tt.Placement.Result, nodes, res)
+						}
+					}
+				})
+			}
+		})
+	}
+}