1 files changed, 78 insertions, 0 deletions
diff --git a/src/go/collectors/go.d.plugin/pkg/metrics/summary_test.go b/src/go/collectors/go.d.plugin/pkg/metrics/summary_test.go
new file mode 100644
index 000000000..b98218369
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/pkg/metrics/summary_test.go
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package metrics
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewSummary(t *testing.T) {
+	s := NewSummary().(*summary)
+	assert.EqualValues(t, 0, s.count)
+	assert.Equal(t, 0.0, s.sum)
+	s.Observe(3.14)
+	assert.Equal(t, 3.14, s.min)
+	assert.Equal(t, 3.14, s.max)
+}
+
+func TestSummary_WriteTo(t *testing.T) {
+	s := NewSummary()
+
+	m1 := map[string]int64{}
+	s.WriteTo(m1, "pi", 100, 1)
+	assert.Len(t, m1, 2)
+	assert.Contains(t, m1, "pi_count")
+	assert.Contains(t, m1, "pi_sum")
+	assert.EqualValues(t, 0, m1["pi_count"])
+	assert.EqualValues(t, 0, m1["pi_sum"])
+
+	s.Observe(3.14)
+	s.Observe(2.71)
+	s.Observe(-10)
+
+	m2 := map[string]int64{}
+	s.WriteTo(m1, "pi", 100, 1)
+	s.WriteTo(m2, "pi", 100, 1)
+	assert.Equal(t, m1, m2)
+	assert.Len(t, m1, 5)
+	assert.EqualValues(t, 3, m1["pi_count"])
+	assert.EqualValues(t, -415, m1["pi_sum"])
+	assert.EqualValues(t, -1000, m1["pi_min"])
+	assert.EqualValues(t, 314, m1["pi_max"])
+	assert.EqualValues(t, -138, m1["pi_avg"])
+
+	s.Reset()
+	s.WriteTo(m1, "pi", 100, 1)
+	assert.Len(t, m1, 2)
+	assert.Contains(t, m1, "pi_count")
+	assert.Contains(t, m1, "pi_sum")
+	assert.EqualValues(t, 0, m1["pi_count"])
+	assert.EqualValues(t, 0, m1["pi_sum"])
+}
+
+func TestSummary_Reset(t *testing.T) {
+	s := NewSummary().(*summary)
+	s.Observe(1)
+	s.Reset()
+	assert.EqualValues(t, 0, s.count)
+}
+
+func BenchmarkSummary_Observe(b *testing.B) {
+	s := NewSummary()
+	for i := 0; i < b.N; i++ {
+		s.Observe(2.5)
+	}
+}
+
+func BenchmarkSummary_WriteTo(b *testing.B) {
+	s := NewSummary()
+	s.Observe(2.5)
+	s.Observe(3.5)
+	s.Observe(4.5)
+	m := map[string]int64{}
+	for i := 0; i < b.N; i++ {
+		s.WriteTo(m, "pi", 100, 1)
+	}
+}