feat(test): improve test coverage

foxtrace_test.go

@@ -6,6 +6,7 @@ import (
 	"github.com/stretchr/testify/require"
 	"github.com/tigerwill90/fox"
 	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/propagation"
 	"go.opentelemetry.io/otel/trace"
 	"net/http"
@@ -86,3 +87,35 @@ func TestPropagationWithCustomPropagators(t *testing.T) {
 	require.NoError(t, err)
 	router.ServeHTTP(w, r)
 }
+
+func TestWithSpanAttributes(t *testing.T) {
+	provider := trace.NewNoopTracerProvider()
+	otel.SetTextMapPropagator(b3prop.New())
+
+	r := httptest.NewRequest("GET", "/user/123?foo=bar", nil)
+	w := httptest.NewRecorder()
+
+	ctx := context.Background()
+	sc := trace.NewSpanContext(trace.SpanContextConfig{
+		TraceID: trace.TraceID{0x01},
+		SpanID:  trace.SpanID{0x01},
+	})
+	ctx = trace.ContextWithRemoteSpanContext(ctx, sc)
+	ctx, _ = provider.Tracer(tracerName).Start(ctx, "test")
+	otel.GetTextMapPropagator().Inject(ctx, propagation.HeaderCarrier(r.Header))
+
+	router := fox.New()
+	mw := New("foobar", WithTracerProvider(provider), WithSpanAttributes(func(r *http.Request) []attribute.KeyValue {
+		attrs := make([]attribute.KeyValue, 1)
+		attrs[0] = attribute.String("http.target", r.URL.String())
+		return attrs
+	}))
+	err := router.Handle(http.MethodGet, "/user/{id}", mw.Trace(func(c fox.Context) {
+		span := trace.SpanFromContext(c.Request().Context())
+		assert.Equal(t, sc.TraceID(), span.SpanContext().TraceID())
+		assert.Equal(t, sc.SpanID(), span.SpanContext().SpanID())
+	}))
+
+	require.NoError(t, err)
+	router.ServeHTTP(w, r)
+}