add notes on stub package

1 files changed, 24 insertions, 0 deletions

diff --git a/journal/2022-05-20.md b/journal/2022-05-20.md
index 437c3bb..0f195df 100644
--- a/journal/2022-05-20.md
+++ b/journal/2022-05-20.md
@@ -25,6 +25,29 @@ I learned:
 I got the ok on building the API gateway as a reverse proxy using casbin, [Gatekeeper][11].
 I also can't believe how easy it was to build a HTTP reverse proxy in golang.
 
+Oh, I almost forgot. I also made an attempt to write a small stubbing library.
+
+e.g.
+
+```golang
+type Greeting struct{}
+
+func (self *Greeting) Greet() string {
+	return "blah"
+}
+
+func TestStub(t *testing.T) {
+	t.Run("returns the stubbed value", func(t *testing.T) {
+		subject := &Greeting{}
+
+		Allow(&subject).ToReceive(subject.Greet).AndReturn("Hello")
+
+		assert.Equal(t, "Hello", subject.Greet())
+	})
+```
+
+It didn't work out because replacing methods at run time isn't [settable][13].
+
 [1]: https://samnewman.io/books/building_microservices_2nd_edition/
 [2]: https://www.packtpub.com/product/architects-of-intelligence/9781789954531
 [3]: https://www.penguinrandomhouse.com/books/565698/genius-makers-by-cade-metz/
@@ -37,3 +60,4 @@ I also can't believe how easy it was to build a HTTP reverse proxy in golang.
 [10]: https://caddyserver.com/docs/getting-started
 [11]: https://github.com/zerocmd/gatekeeper
 [12]: https://pkg.go.dev/net/http/httputil#example-ReverseProxy
+[13]: https://github.com/zerocmd/xlgmokha/blob/7115c4e45a7b04c4e823722b743b5bbcf43720bf/learn/golang/README.md#reflection