add tracing package (forgot to commit)

tracing/tracing_test.go

@@ -0,0 +1,21 @@
+package tracing
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIt(t *testing.T) {
+	ctx := context.Background()
+
+	ctx = Child(ctx, "a")
+	ctx = Child(ctx, "b")
+	ctx = Child(ctx, "c")
+	ctx = Child(ctx, "d")
+
+	assert.Equal(t, "dcba", strings.Join(GetStack(ctx), ""))
+
+}