Add test for multi-inst view error (#4308)

sdk/metric/view_test.go

@@ -20,6 +20,7 @@ import (
 	"testing"
 
 	"github.com/go-logr/logr"
+	"github.com/go-logr/logr/funcr"
 	"github.com/go-logr/logr/testr"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -466,6 +467,20 @@ func TestNewViewAggregationErrorLogged(t *testing.T) {
 	assert.Equal(t, 1, l.ErrorN())
 }
 
+func TestNewViewMultiInstMatchErrorLogged(t *testing.T) {
+	var got string
+	otel.SetLogger(funcr.New(func(_, args string) {
+		got = args
+	}, funcr.Options{Verbosity: 6}))
+
+	_ = NewView(Instrument{
+		Name: "*", // Wildcard match name (multiple instruments).
+	}, Stream{
+		Name: "non-empty",
+	})
+	assert.Contains(t, got, errMultiInst.Error())
+}
+
 func ExampleNewView() {
 	// Create a view that renames the "latency" instrument from the v0.34.0
 	// version of the "http" instrumentation library as "request.latency".