Fix the issue of incorrect values notified in the configuration center (#5348)

core/configcenter/subscriber/etcd_test.go

@@ -0,0 +1,186 @@
+package subscriber
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/zeromicro/go-zero/core/discov"
+)
+
+const (
+	actionAdd = iota
+	actionDel
+)
+
+func TestConfigCenterContainer(t *testing.T) {
+	type action struct {
+		act int
+		key string
+		val string
+	}
+	tests := []struct {
+		name   string
+		do     []action
+		expect []string
+	}{
+		{
+			name: "add one",
+			do: []action{
+				{
+					act: actionAdd,
+					key: "first",
+					val: "a",
+				},
+			},
+			expect: []string{
+				"a",
+			},
+		},
+		{
+			name: "add two",
+			do: []action{
+				{
+					act: actionAdd,
+					key: "first",
+					val: "a",
+				},
+				{
+					act: actionAdd,
+					key: "second",
+					val: "b",
+				},
+			},
+			expect: []string{
+				"b",
+			},
+		},
+		{
+			name: "add two, delete one",
+			do: []action{
+				{
+					act: actionAdd,
+					key: "first",
+					val: "a",
+				},
+				{
+					act: actionAdd,
+					key: "second",
+					val: "b",
+				},
+				{
+					act: actionDel,
+					key: "first",
+				},
+			},
+			expect: []string(nil),
+		},
+		{
+			name: "add two, delete two",
+			do: []action{
+				{
+					act: actionAdd,
+					key: "first",
+					val: "a",
+				},
+				{
+					act: actionAdd,
+					key: "second",
+					val: "b",
+				},
+				{
+					act: actionDel,
+					key: "first",
+				},
+				{
+					act: actionDel,
+					key: "second",
+				},
+			},
+			expect: []string(nil),
+		},
+		{
+			name: "add two, dup values",
+			do: []action{
+				{
+					act: actionAdd,
+					key: "first",
+					val: "a",
+				},
+				{
+					act: actionAdd,
+					key: "second",
+					val: "b",
+				},
+				{
+					act: actionAdd,
+					key: "third",
+					val: "a",
+				},
+			},
+			expect: []string{"a"},
+		},
+		{
+			name: "add three, dup values, delete two, add one",
+			do: []action{
+				{
+					act: actionAdd,
+					key: "first",
+					val: "a",
+				},
+				{
+					act: actionAdd,
+					key: "second",
+					val: "b",
+				},
+				{
+					act: actionAdd,
+					key: "third",
+					val: "a",
+				},
+				{
+					act: actionDel,
+					key: "first",
+				},
+				{
+					act: actionDel,
+					key: "second",
+				},
+				{
+					act: actionAdd,
+					key: "forth",
+					val: "c",
+				},
+			},
+			expect: []string{"c"},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			var changed bool
+			c := newConfigCenterContainer()
+			c.AddListener(func() {
+				changed = true
+			})
+			assert.Nil(t, c.GetValues())
+			assert.False(t, changed)
+
+			for _, order := range test.do {
+				if order.act == actionAdd {
+					c.OnAdd(discov.KV{
+						Key: order.key,
+						Val: order.val,
+					})
+				} else {
+					c.OnDelete(discov.KV{
+						Key: order.key,
+						Val: order.val,
+					})
+				}
+			}
+
+			assert.True(t, changed)
+			assert.ElementsMatch(t, test.expect, c.GetValues())
+		})
+	}
+}