Add integration tests for otlploggrpc exporter (#5614)

Part of https://github.com/open-telemetry/opentelemetry-go/issues/5056

exporters/otlp/otlplog/otlploggrpc/exporter_test.go

@@ -6,6 +6,7 @@ package otlploggrpc
 import (
 	"context"
 	"errors"
+	"fmt"
 	"runtime"
 	"sync"
 	"sync/atomic"
@@ -14,8 +15,10 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
+	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/log"
 	sdklog "go.opentelemetry.io/otel/sdk/log"
+	collogpb "go.opentelemetry.io/proto/otlp/collector/logs/v1"
 	logpb "go.opentelemetry.io/proto/otlp/logs/v1"
 )
 
@@ -149,3 +152,84 @@ func TestExporterConcurrentSafe(t *testing.T) {
 	cancel()
 	wg.Wait()
 }
+
+// TestExporter runs integration test against the real OTLP collector.
+func TestExporter(t *testing.T) {
+	t.Run("ExporterHonorsContextErrors", func(t *testing.T) {
+		t.Run("Export", testCtxErrs(func() func(context.Context) error {
+			c, _ := clientFactory(t, nil)
+			e := newExporter(c)
+			return func(ctx context.Context) error {
+				return e.Export(ctx, []sdklog.Record{{}})
+			}
+		}))
+
+		t.Run("Shutdown", testCtxErrs(func() func(context.Context) error {
+			c, _ := clientFactory(t, nil)
+			e := newExporter(c)
+			return e.Shutdown
+		}))
+	})
+
+	t.Run("Export", func(t *testing.T) {
+		ctx := context.Background()
+		c, coll := clientFactory(t, nil)
+		e := newExporter(c)
+
+		require.NoError(t, e.Export(ctx, records))
+		require.NoError(t, e.Shutdown(ctx))
+		got := coll.Collect().Dump()
+		require.Len(t, got, 1, "upload of one ResourceLogs")
+		require.Len(t, got[0].ScopeLogs, 1, "upload of one ScopeLogs")
+		require.Len(t, got[0].ScopeLogs[0].LogRecords, 2, "upload of two ScopeLogs")
+
+		// Check body
+		assert.Equal(t, "A", got[0].ScopeLogs[0].LogRecords[0].Body.GetStringValue())
+		assert.Equal(t, "B", got[0].ScopeLogs[0].LogRecords[1].Body.GetStringValue())
+	})
+
+	t.Run("PartialSuccess", func(t *testing.T) {
+		const n, msg = 2, "bad data"
+		rCh := make(chan exportResult, 3)
+		rCh <- exportResult{
+			Response: &collogpb.ExportLogsServiceResponse{
+				PartialSuccess: &collogpb.ExportLogsPartialSuccess{
+					RejectedLogRecords: n,
+					ErrorMessage:       msg,
+				},
+			},
+		}
+		rCh <- exportResult{
+			Response: &collogpb.ExportLogsServiceResponse{
+				PartialSuccess: &collogpb.ExportLogsPartialSuccess{
+					// Should not be logged.
+					RejectedLogRecords: 0,
+					ErrorMessage:       "",
+				},
+			},
+		}
+		rCh <- exportResult{
+			Response: &collogpb.ExportLogsServiceResponse{},
+		}
+
+		ctx := context.Background()
+		c, _ := clientFactory(t, rCh)
+		e := newExporter(c)
+
+		defer func(orig otel.ErrorHandler) {
+			otel.SetErrorHandler(orig)
+		}(otel.GetErrorHandler())
+
+		var errs []error
+		eh := otel.ErrorHandlerFunc(func(e error) { errs = append(errs, e) })
+		otel.SetErrorHandler(eh)
+
+		require.NoError(t, e.Export(ctx, records))
+		require.NoError(t, e.Export(ctx, records))
+		require.NoError(t, e.Export(ctx, records))
+
+		require.Equal(t, 1, len(errs))
+		want := fmt.Sprintf("%s (%d log records rejected)", msg, n)
+		assert.ErrorContains(t, errs[0], want)
+	})
+}