Add GRPC Client Metrics

internal/metrics/helpers_test.go

@@ -0,0 +1,25 @@
+package metrics
+
+import (
+	"strings"
+	"testing"
+
+	"go.opencensus.io/stats"
+	"go.opencensus.io/stats/view"
+)
+
+func testDataRetrieval(measure stats.Measure, t *testing.T, want string) {
+	name := measure.Name()
+	data, err := view.RetrieveData(name)
+
+	if err != nil {
+		t.Fatalf("%s: failed to retrieve data line %s", name, err)
+	}
+	if len(data) != 1 {
+		t.Errorf("%s: received too many data rows: %d", name, len(data))
+	}
+
+	if !strings.HasPrefix(data[0].String(), want) {
+		t.Errorf("%s: Found unexpected data row: \nwant: %s\ngot: %s\n", name, want, data[0].String())
+	}
+}