test(selector): improve coverage (#2320)

* test(selector): improve coverage

* style: gofumpt

selector/selector_test.go

@@ -12,6 +12,8 @@ import (
 	"github.com/go-kratos/kratos/v2/registry"
 )
 
+var errNodeNotMatch = errors.New("node is not match")
+
 type mockWeightedNode struct {
 	Node
 
@@ -80,6 +82,18 @@ func (b *mockBalancer) Pick(ctx context.Context, nodes []WeightedNode) (selected
 	return
 }
 
+type mockMustErrorBalancerBuilder struct{}
+
+func (b *mockMustErrorBalancerBuilder) Build() Balancer {
+	return &mockMustErrorBalancer{}
+}
+
+type mockMustErrorBalancer struct{}
+
+func (b *mockMustErrorBalancer) Pick(ctx context.Context, nodes []WeightedNode) (selected WeightedNode, done DoneFunc, err error) {
+	return nil, nil, errNodeNotMatch
+}
+
 func TestDefault(t *testing.T) {
 	builder := DefaultBuilder{
 		Node:     &mockWeightedNodeBuilder{},
@@ -107,6 +121,7 @@ func TestDefault(t *testing.T) {
 			Endpoints: []string{"http://127.0.0.1:9090"},
 			Metadata:  map[string]string{"weight": "10"},
 		}))
+
 	selector.Apply(nodes)
 	n, done, err := selector.Select(context.Background(), WithNodeFilter(mockFilter("v2.0.0")))
 	if err != nil {
@@ -121,6 +136,9 @@ func TestDefault(t *testing.T) {
 	if !reflect.DeepEqual("v2.0.0", n.Version()) {
 		t.Errorf("expect %v, got %v", "v2.0.0", n.Version())
 	}
+	if n.Scheme() == "" {
+		t.Errorf("expect %v, got %v", "", n.Scheme())
+	}
 	if n.Address() == "" {
 		t.Errorf("expect %v, got %v", "", n.Address())
 	}
@@ -135,6 +153,21 @@ func TestDefault(t *testing.T) {
 	}
 	done(context.Background(), DoneInfo{})
 
+	// peer in ctx
+	ctx := NewPeerContext(context.Background(), &Peer{
+		Node: mockWeightedNode{},
+	})
+	n, done, err = selector.Select(ctx)
+	if err != nil {
+		t.Errorf("expect %v, got %v", ErrNoAvailable, err)
+	}
+	if done == nil {
+		t.Errorf("expect %v, got %v", nil, done)
+	}
+	if n == nil {
+		t.Errorf("expect %v, got %v", nil, n)
+	}
+
 	// no v3.0.0 instance
 	n, done, err = selector.Select(context.Background(), WithNodeFilter(mockFilter("v3.0.0")))
 	if !errors.Is(ErrNoAvailable, err) {
@@ -172,4 +205,87 @@ func TestDefault(t *testing.T) {
 	if n != nil {
 		t.Errorf("expect %v, got %v", nil, n)
 	}
+
+	// without node_filters
+	n, done, err = selector.Select(context.Background())
+	if !errors.Is(ErrNoAvailable, err) {
+		t.Errorf("expect %v, got %v", ErrNoAvailable, err)
+	}
+	if done != nil {
+		t.Errorf("expect %v, got %v", nil, done)
+	}
+	if n != nil {
+		t.Errorf("expect %v, got %v", nil, n)
+	}
+}
+
+func TestWithoutApply(t *testing.T) {
+	builder := DefaultBuilder{
+		Node:     &mockWeightedNodeBuilder{},
+		Balancer: &mockBalancerBuilder{},
+	}
+	selector := builder.Build()
+	n, done, err := selector.Select(context.Background())
+	if !errors.Is(ErrNoAvailable, err) {
+		t.Errorf("expect %v, got %v", ErrNoAvailable, err)
+	}
+	if done != nil {
+		t.Errorf("expect %v, got %v", nil, done)
+	}
+	if n != nil {
+		t.Errorf("expect %v, got %v", nil, n)
+	}
+}
+
+func TestNoPick(t *testing.T) {
+	builder := DefaultBuilder{
+		Node:     &mockWeightedNodeBuilder{},
+		Balancer: &mockMustErrorBalancerBuilder{},
+	}
+	var nodes []Node
+	nodes = append(nodes, NewNode(
+		"http",
+		"127.0.0.1:8080",
+		&registry.ServiceInstance{
+			ID:        "127.0.0.1:8080",
+			Name:      "helloworld",
+			Version:   "v2.0.0",
+			Endpoints: []string{"http://127.0.0.1:8080"},
+			Metadata:  map[string]string{"weight": "10"},
+		}))
+	nodes = append(nodes, NewNode(
+		"http",
+		"127.0.0.1:9090",
+		&registry.ServiceInstance{
+			ID:        "127.0.0.1:9090",
+			Name:      "helloworld",
+			Version:   "v1.0.0",
+			Endpoints: []string{"http://127.0.0.1:9090"},
+			Metadata:  map[string]string{"weight": "10"},
+		}))
+	selector := builder.Build()
+	selector.Apply(nodes)
+	n, done, err := selector.Select(context.Background())
+	if !errors.Is(errNodeNotMatch, err) {
+		t.Errorf("expect %v, got %v", errNodeNotMatch, err)
+	}
+	if done != nil {
+		t.Errorf("expect %v, got %v", nil, done)
+	}
+	if n != nil {
+		t.Errorf("expect %v, got %v", nil, n)
+	}
+}
+
+func TestGolobal(t *testing.T) {
+	builder := DefaultBuilder{
+		Node:     &mockWeightedNodeBuilder{},
+		Balancer: &mockBalancerBuilder{},
+	}
+	SetGlobalSelector(&builder)
+
+	gBuilder := GlobalSelector()
+	if gBuilder == nil {
+		t.Errorf("expect %v, got %v", nil, gBuilder)
+	}
 }