tracer and logger improvements

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

tracer/memory/memory_test.go

@@ -0,0 +1,38 @@
+package memory
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"strings"
+	"testing"
+
+	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v3/logger/slog"
+	"go.unistack.org/micro/v3/tracer"
+)
+
+func TestLoggerWithTracer(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	logger.DefaultLogger = slog.NewLogger(logger.WithOutput(buf))
+
+	if err := logger.Init(); err != nil {
+		t.Fatal(err)
+	}
+	var span tracer.Span
+	tr := NewTracer()
+	ctx, span = tr.Start(ctx, "test1")
+
+	logger.Error(ctx, "my test error", fmt.Errorf("error"))
+
+	if !strings.Contains(buf.String(), span.TraceID()) {
+		t.Fatalf("log does not contains trace id: %s", buf.Bytes())
+	}
+
+	_, _ = tr.Start(ctx, "test2")
+
+	for _, s := range tr.Spans() {
+		_ = s
+	}
+}