test: add a test for http_stream

Makefile

@@ -7,6 +7,9 @@ build:
 test:
 	@dune runtest --no-buffer --force
 
+test-autopromote:
+	@dune runtest --no-buffer --force --auto-promote
+
 clean:
 	@dune clean
 

README.md

@@ -33,7 +33,7 @@ val url : string = "https://curl.haxx.se/"
 # let res = Ezcurl.get ~url ();;
 ...
 # let content = match res with Ok c -> c | Error (_,s) -> failwith s;;
-val content : Ezcurl_core.response =
+val content : string Ezcurl_core.response =
 ...
 
 # content.Ezcurl.code;;

test/basic_test.expected

@@ -0,0 +1,39 @@
+get: OK
+body=```
+version = 0.26.2
+profile=conventional
+margin=80
+if-then-else=k-r
+parens-ite=true
+parens-tuple=multi-line-only
+sequence-style=terminator
+type-decl=sparse
+break-cases=toplevel
+cases-exp-indent=2
+field-space=tight-decl
+leading-nested-match-parens=true
+module-item-spacing=compact
+quiet=true
+ocaml-version=4.08.0
+
+```
+streaming get: OK
+body=```
+version = 0.26.2
+profile=conventional
+margin=80
+if-then-else=k-r
+parens-ite=true
+parens-tuple=multi-line-only
+sequence-style=terminator
+type-decl=sparse
+break-cases=toplevel
+cases-exp-indent=2
+field-space=tight-decl
+leading-nested-match-parens=true
+module-item-spacing=compact
+quiet=true
+ocaml-version=4.08.0
+
+```
+same buf? true

test/basic_test.ml

@@ -1,10 +1,30 @@
+let body = ref ""
+
+let url =
+  "https://raw.githubusercontent.com/c-cube/ezcurl/refs/heads/main/.ocamlformat"
+
 let () =
+  match Ezcurl.get ~url () with
+  | Error (code, msg) ->
+    Format.eprintf "curl error: code `%s` (%s)@." (Curl.strerror code) msg
+  | Ok res ->
+    body := res.body;
+    Format.printf "get: OK@.body=```@.%s@.```@." !body
+
+let () =
+  let buf = Buffer.create 32 in
   match
-    Ezcurl.get
-      ~url:
-        "https://archive.softwareheritage.org/api/1/content/sha1_git:7bdf38d4468c114206c9b6ebd9cf1176e085d346/"
+    Ezcurl.http_stream ~meth:GET ~url
+      ~write_into:
+        (object
+           method on_input bs i len = Buffer.add_subbytes buf bs i len
+           method on_close () = ()
+        end)
       ()
   with
   | Error (code, msg) ->
     Format.eprintf "curl error: code `%s` (%s)@." (Curl.strerror code) msg
-  | Ok _response -> Format.printf "OK@."
+  | Ok _res ->
+    let new_body = Buffer.contents buf in
+    Format.printf "streaming get: OK@.body=```@.%s@.```@." new_body;
+    Format.printf "same buf? %b@." (new_body = !body)