1 files changed, 67 insertions, 0 deletions
diff --git a/src/go/collectors/go.d.plugin/agent/discovery/sim_test.go b/src/go/collectors/go.d.plugin/agent/discovery/sim_test.go
new file mode 100644
index 000000000..0b777f392
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/agent/discovery/sim_test.go
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package discovery
+
+import (
+	"context"
+	"sort"
+	"testing"
+	"time"
+
+	"github.com/netdata/netdata/go/go.d.plugin/agent/confgroup"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+type discoverySim struct {
+	mgr            *Manager
+	collectDelay   time.Duration
+	expectedGroups []*confgroup.Group
+}
+
+func (sim discoverySim) run(t *testing.T) {
+	t.Helper()
+	require.NotNil(t, sim.mgr)
+
+	in, out := make(chan []*confgroup.Group), make(chan []*confgroup.Group)
+	go sim.collectGroups(t, in, out)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	go sim.mgr.Run(ctx, in)
+
+	actualGroups := <-out
+
+	sortGroups(sim.expectedGroups)
+	sortGroups(actualGroups)
+
+	assert.Equal(t, sim.expectedGroups, actualGroups)
+}
+
+func (sim discoverySim) collectGroups(t *testing.T, in, out chan []*confgroup.Group) {
+	time.Sleep(sim.collectDelay)
+
+	timeout := sim.mgr.sendEvery + time.Second*2
+	var groups []*confgroup.Group
+loop:
+	for {
+		select {
+		case inGroups := <-in:
+			if groups = append(groups, inGroups...); len(groups) >= len(sim.expectedGroups) {
+				break loop
+			}
+		case <-time.After(timeout):
+			t.Logf("discovery %s timed out after %s, got %d groups, expected %d, some events are skipped",
+				sim.mgr.discoverers, timeout, len(groups), len(sim.expectedGroups))
+			break loop
+		}
+	}
+	out <- groups
+}
+
+func sortGroups(groups []*confgroup.Group) {
+	if len(groups) == 0 {
+		return
+	}
+	sort.Slice(groups, func(i, j int) bool { return groups[i].Source < groups[j].Source })
+}