Test http

command/agent/stats_endpoint_test.go

 package agent
 
 import (
+	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"testing"
 
+	"github.com/docker/distribution/uuid"
 	"github.com/hashicorp/nomad/acl"
+	"github.com/hashicorp/nomad/nomad"
 	"github.com/hashicorp/nomad/nomad/mock"
 	"github.com/hashicorp/nomad/nomad/structs"
+	"github.com/hashicorp/nomad/testutil"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestClientStatsRequest(t *testing.T) {
 	t.Parallel()
+	require := require.New(t)
 	httpTest(t, nil, func(s *TestAgent) {
-		req, err := http.NewRequest("GET", "/v1/client/stats/?since=foo", nil)
-		if err != nil {
-			t.Fatalf("err: %v", err)
+
+		// Local node, local resp
+		{
+			req, err := http.NewRequest("GET", "/v1/client/stats/?since=foo", nil)
+			if err != nil {
+				t.Fatalf("err: %v", err)
+			}
+
+			respW := httptest.NewRecorder()
+			_, err = s.Server.ClientStatsRequest(respW, req)
+			if err != nil {
+				t.Fatalf("unexpected err: %v", err)
+			}
+		}
+
+		// Local node, server resp
+		{
+			srv := s.server
+			s.server = nil
+
+			req, err := http.NewRequest("GET", fmt.Sprintf("/v1/client/stats?node_id=%s", uuid.Generate()), nil)
+			require.Nil(err)
+
+			respW := httptest.NewRecorder()
+			_, err = s.Server.ClientStatsRequest(respW, req)
+			require.NotNil(err)
+			require.Contains(err.Error(), "Unknown node")
+
+			s.server = srv
 		}
 
-		respW := httptest.NewRecorder()
-		_, err = s.Server.ClientStatsRequest(respW, req)
-		if err != nil {
-			t.Fatalf("unexpected err: %v", err)
+		// no client, server resp
+		{
+			c := s.client
+			s.client = nil
+
+			testutil.WaitForResult(func() (bool, error) {
+				n, err := s.server.State().NodeByID(nil, c.NodeID())
+				if err != nil {
+					return false, err
+				}
+				return n != nil, nil
+			}, func(err error) {
+				t.Fatalf("should have client: %v", err)
+			})
+
+			req, err := http.NewRequest("GET", fmt.Sprintf("/v1/client/stats?node_id=%s", c.NodeID()), nil)
+			require.Nil(err)
+
+			respW := httptest.NewRecorder()
+			_, err = s.Server.ClientStatsRequest(respW, req)
+			require.NotNil(err)
+
+			// The dev agent uses in-mem RPC so just assert the no route error
+			require.Contains(err.Error(), nomad.ErrNoNodeConn.Error())
+
+			s.client = c
 		}
 	})
 }