create and use helper for deep equality

internal/testing/assert/assert.go

@@ -1,15 +1,24 @@
 package assert
 
-import "testing"
+import (
+	"testing"
+	"reflect"
+)
 
 func Equal[T comparable](t *testing.T, got, want T) {
 	if (got != want) {
-		t.Errorf("not equal %v and %v", got, want)
+		t.Errorf("not equal: %v and %v", got, want)
 	}
 }
 
 func NotEqual[T comparable](t *testing.T, got, want T) {
 	if (got == want) {
-		t.Errorf("unexpected equal %v and %v", got, want)
+		t.Errorf("unexpected equal: %v and %v", got, want)
+	}
+}
+
+func DeepEqual(t *testing.T, got, want interface{}){
+	if !(reflect.DeepEqual(got,want)) {
+		t.Errorf("unequal deep structure: wanted %v; but got %v", want, got)
 	}
 }