erlang: spawn/1 + self/0 + is_pid (+13 tests)

lib/erlang/tests/eval.sx

@@ -285,6 +285,48 @@
   (do (er-io-flush!) (ev "io:format(\"50~~\")") (er-io-buffer-content))
   "50~")
 
+;; ── processes: self/0, spawn/1, is_pid ──────────────────────────
+(er-eval-test "self tag"
+  (get (ev "self()") :tag) "pid")
+(er-eval-test "is_pid self"
+  (nm (ev "is_pid(self())")) "true")
+(er-eval-test "is_pid number"
+  (nm (ev "is_pid(42)")) "false")
+(er-eval-test "is_pid atom"
+  (nm (ev "is_pid(ok)")) "false")
+(er-eval-test "self equals self"
+  (nm (ev "Pid = self(), Pid =:= Pid")) "true")
+(er-eval-test "self =:= self expr"
+  (nm (ev "self() == self()")) "true")
+(er-eval-test "spawn returns pid"
+  (get (ev "spawn(fun () -> ok end)") :tag) "pid")
+(er-eval-test "is_pid spawn"
+  (nm (ev "is_pid(spawn(fun () -> ok end))")) "true")
+(er-eval-test "spawn new pid distinct"
+  (nm (ev "P1 = self(), P2 = spawn(fun () -> ok end), P1 =:= P2"))
+  "false")
+(er-eval-test "two spawns distinct"
+  (nm (ev "P1 = spawn(fun () -> ok end), P2 = spawn(fun () -> ok end), P1 =:= P2"))
+  "false")
+(er-eval-test "spawn then drain io"
+  (do
+    (er-io-flush!)
+    (ev "spawn(fun () -> io:format(\"child~n\") end), io:format(\"parent~n\")")
+    (er-io-buffer-content))
+  "parent\nchild\n")
+(er-eval-test "multiple spawn ordering"
+  (do
+    (er-io-flush!)
+    (ev "spawn(fun () -> io:format(\"a~n\") end), spawn(fun () -> io:format(\"b~n\") end), io:format(\"main~n\")")
+    (er-io-buffer-content))
+  "main\na\nb\n")
+(er-eval-test "child self is its own pid"
+  (do
+    (er-io-flush!)
+    (ev "P = spawn(fun () -> io:format(\"~p\", [is_pid(self())]) end), io:format(\"~p;\", [is_pid(P)])")
+    (er-io-buffer-content))
+  "true;true")
+
 (define
   er-eval-test-summary
   (str "eval " er-eval-test-pass "/" er-eval-test-count))