add more test coverage

service/internal/proctelemetry/process_telemetry_linux_test.go

@@ -0,0 +1,57 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+//go:build linux
+// +build linux
+
+package proctelemetry
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.opencensus.io/metric"
+	"go.opentelemetry.io/otel/metric/noop"
+)
+
+func TestOCProcessTelemetryWithHostProc(t *testing.T) {
+	ocRegistry := metric.NewRegistry()
+	// Make the sure the environment variable value is not used.
+	t.Setenv("HOST_PROC", "foo/bar")
+
+	require.NoError(t, RegisterProcessMetrics(ocRegistry, noop.NewMeterProvider(), false, 0, "/proc"))
+
+	// Check that the metrics are actually filled.
+	time.Sleep(200 * time.Millisecond)
+
+	metrics := ocRegistry.Read()
+
+	for _, metricName := range expectedMetrics {
+		m := findMetric(metrics, metricName)
+		require.NotNil(t, m)
+		require.Len(t, m.TimeSeries, 1)
+		ts := m.TimeSeries[0]
+		assert.Len(t, ts.LabelValues, 0)
+		require.Len(t, ts.Points, 1)
+
+		var value float64
+		if metricName == "process/uptime" || metricName == "process/cpu_seconds" {
+			value = ts.Points[0].Value.(float64)
+		} else {
+			value = float64(ts.Points[0].Value.(int64))
+		}
+
+		if metricName == "process/uptime" || metricName == "process/cpu_seconds" {
+			// This likely will still be zero when running the test.
+			assert.GreaterOrEqual(t, value, float64(0), metricName)
+			continue
+		}
+		assert.Greater(t, value, float64(0), metricName)
+	}
+}
+
+func TestOCProcessTelemetryWithHostProcErrOnBadValue(t *testing.T) {
+	require.Error(t, RegisterProcessMetrics(metric.NewRegistry(), noop.NewMeterProvider(), false, 0, "/root"))
+}

service/internal/proctelemetry/process_telemetry_test.go

@@ -140,43 +140,7 @@ func TestOCProcessTelemetry(t *testing.T) {
 	require.NoError(t, RegisterProcessMetrics(ocRegistry, noop.NewMeterProvider(), false, 0, ""))
 
 	// Check that the metrics are actually filled.
-	<-time.After(200 * time.Millisecond)
-
-	metrics := ocRegistry.Read()
-
-	for _, metricName := range expectedMetrics {
-		m := findMetric(metrics, metricName)
-		require.NotNil(t, m)
-		require.Len(t, m.TimeSeries, 1)
-		ts := m.TimeSeries[0]
-		assert.Len(t, ts.LabelValues, 0)
-		require.Len(t, ts.Points, 1)
-
-		var value float64
-		if metricName == "process/uptime" || metricName == "process/cpu_seconds" {
-			value = ts.Points[0].Value.(float64)
-		} else {
-			value = float64(ts.Points[0].Value.(int64))
-		}
-
-		if metricName == "process/uptime" || metricName == "process/cpu_seconds" {
-			// This likely will still be zero when running the test.
-			assert.GreaterOrEqual(t, value, float64(0), metricName)
-			continue
-		}
-		assert.Greater(t, value, float64(0), metricName)
-	}
-}
-
-func TestOCProcessTelemetryWithHostProc(t *testing.T) {
-	ocRegistry := metric.NewRegistry()
-	// Make the sure the environment variable value is not used.
-	t.Setenv("HOST_PROC", "foo/bar")
-
-	require.NoError(t, RegisterProcessMetrics(ocRegistry, noop.NewMeterProvider(), false, 0, "/proc"))
-
-	// Check that the metrics are actually filled.
-	<-time.After(200 * time.Millisecond)
+	time.Sleep(200 * time.Millisecond)
 
 	metrics := ocRegistry.Read()