unit test added for GetUsersListByIds

internal/gapi/get_users_list_by_ids_test.go

@@ -0,0 +1,67 @@
+package gapi
+
+import (
+	"context"
+	"net"
+	"testing"
+
+	"github.com/ansh-devs/tc-assessment/internal/database"
+	"github.com/ansh-devs/tc-assessment/protos"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"google.golang.org/grpc/test/bufconn"
+)
+
+func TestUserService_GetUsersListByIds(t *testing.T) {
+	lis := bufconn.Listen(1024 * 1024)
+
+	// equivalent to defer
+	t.Cleanup(func() {
+		lis.Close()
+	})
+	srvr := grpc.NewServer()
+
+	t.Cleanup(func() {
+		srvr.Stop()
+	})
+
+	svc := UserService{
+		Repository: database.NewUserRepository(),
+	}
+	protos.RegisterUserServiceServer(srvr, &svc)
+	go func() {
+		if err := srvr.Serve(lis); err != nil {
+			t.Fatalf("srvr.Serve :%v", err)
+		}
+	}()
+
+	// Testing
+	dialer := func(context.Context, string) (net.Conn, error) {
+		return lis.Dial()
+	}
+	conn, err := grpc.DialContext(context.Background(), "", grpc.WithContextDialer(dialer), grpc.WithInsecure())
+	t.Cleanup(func() {
+		conn.Close()
+	})
+	if err != nil {
+		t.Fatalf("grpc.DialContext %v", err)
+	}
+	client := protos.NewUserServiceClient(conn)
+	resp, err := client.GetUsersListByIds(context.Background(), &protos.GetUsersListByIdsRequest{Ids: []int64{5, 8}})
+	if err != nil {
+		t.Fatalf("GetUsersListByIds error %v", err)
+	}
+	for _, v := range resp.GetUsers() {
+		if !(v.Id == 5 || v.Id == 8) {
+			t.Fatalf("Unexpected values %v", v)
+		}
+	}
+
+	// Case when out of bound id is passed resulting in InvalidArgument proto error
+	_, err = client.GetUsersListByIds(context.Background(), &protos.GetUsersListByIdsRequest{Ids: []int64{42}})
+	code, _ := status.FromError(err)
+	if code.Code() != codes.InvalidArgument {
+		t.Fatalf("GetUsersListByIds error Invalid Argument unexpected code %v", err)
+	}
+}