1 files changed, 50 insertions, 0 deletions
diff --git a/src/go/collectors/go.d.plugin/agent/ticker/ticket_test.go b/src/go/collectors/go.d.plugin/agent/ticker/ticket_test.go
new file mode 100644
index 000000000..193085365
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/agent/ticker/ticket_test.go
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package ticker
+
+import (
+	"testing"
+	"time"
+)
+
+// TODO: often fails Circle CI (~200-240)
+var allowedDelta = 500 * time.Millisecond
+
+func TestTickerParallel(t *testing.T) {
+	for i := 0; i < 100; i++ {
+		i := i
+		go func() {
+			time.Sleep(time.Second / 100 * time.Duration(i))
+			TestTicker(t)
+		}()
+	}
+	time.Sleep(4 * time.Second)
+}
+
+func TestTicker(t *testing.T) {
+	tk := New(time.Second)
+	defer tk.Stop()
+	prev := time.Now()
+	for i := 0; i < 3; i++ {
+		<-tk.C
+		now := time.Now()
+		diff := abs(now.Round(time.Second).Sub(now))
+		if diff >= allowedDelta {
+			t.Errorf("Ticker is not aligned: expect delta < %v but was: %v (%s)", allowedDelta, diff, now.Format(time.RFC3339Nano))
+		}
+		if i > 0 {
+			dt := now.Sub(prev)
+			if abs(dt-time.Second) >= allowedDelta {
+				t.Errorf("Ticker interval: expect delta < %v ns but was: %v", allowedDelta, abs(dt-time.Second))
+			}
+		}
+		prev = now
+	}
+}
+
+func abs(a time.Duration) time.Duration {
+	if a < 0 {
+		return -a
+	}
+	return a
+}