erlang: link/unlink/monitor/demonitor + refs (+17 tests)

lib/erlang/tests/eval.sx

@@ -432,6 +432,76 @@
     (nm (er-last-main-exit-reason)))
   "from_fn")
 
+;; ── refs / link / monitor ──────────────────────────────────────
+(er-eval-test "make_ref tag"
+  (get (ev "make_ref()") :tag) "ref")
+(er-eval-test "is_reference fresh"
+  (nm (ev "R = make_ref(), is_reference(R)")) "true")
+(er-eval-test "is_reference pid"
+  (nm (ev "is_reference(self())")) "false")
+(er-eval-test "is_reference number"
+  (nm (ev "is_reference(42)")) "false")
+(er-eval-test "make_ref distinct"
+  (nm (ev "R1 = make_ref(), R2 = make_ref(), R1 =:= R2")) "false")
+(er-eval-test "make_ref same id eq"
+  (nm (ev "R = make_ref(), R =:= R")) "true")
+
+(er-eval-test "link returns true"
+  (nm (ev "P = spawn(fun () -> ok end), link(P)")) "true")
+(er-eval-test "self link returns true"
+  (nm (ev "link(self())")) "true")
+(er-eval-test "unlink returns true"
+  (nm (ev "P = spawn(fun () -> ok end), link(P), unlink(P)")) "true")
+(er-eval-test "unlink without link"
+  (nm (ev "P = spawn(fun () -> ok end), unlink(P)")) "true")
+
+(er-eval-test "monitor returns ref"
+  (get (ev "P = spawn(fun () -> ok end), monitor(process, P)") :tag)
+  "ref")
+(er-eval-test "monitor refs distinct"
+  (nm (ev "P = spawn(fun () -> ok end), R1 = monitor(process, P), R2 = monitor(process, P), R1 =:= R2"))
+  "false")
+(er-eval-test "demonitor returns true"
+  (nm (ev "P = spawn(fun () -> ok end), R = monitor(process, P), demonitor(R)"))
+  "true")
+
+;; Bidirectional link recorded on both sides.
+(er-eval-test "link bidirectional"
+  (do
+    (ev "P = spawn(fun () -> receive forever -> ok end end), link(P)")
+    ;; After eval, check links on main + child via accessors.
+    (and
+      (= (len (er-proc-field (er-mk-pid 0) :links)) 1)
+      (= (len (er-proc-field (er-mk-pid 1) :links)) 1)))
+  true)
+
+;; unlink clears both sides.
+(er-eval-test "unlink clears both"
+  (do
+    (ev "P = spawn(fun () -> receive forever -> ok end end), link(P), unlink(P)")
+    (and
+      (= (len (er-proc-field (er-mk-pid 0) :links)) 0)
+      (= (len (er-proc-field (er-mk-pid 1) :links)) 0)))
+  true)
+
+;; monitor adds entries to both lists.
+(er-eval-test "monitor records both sides"
+  (do
+    (ev "P = spawn(fun () -> receive forever -> ok end end), monitor(process, P)")
+    (and
+      (= (len (er-proc-field (er-mk-pid 0) :monitors)) 1)
+      (= (len (er-proc-field (er-mk-pid 1) :monitored-by)) 1)))
+  true)
+
+;; demonitor clears both lists.
+(er-eval-test "demonitor clears both"
+  (do
+    (ev "P = spawn(fun () -> receive forever -> ok end end), R = monitor(process, P), demonitor(R)")
+    (and
+      (= (len (er-proc-field (er-mk-pid 0) :monitors)) 0)
+      (= (len (er-proc-field (er-mk-pid 1) :monitored-by)) 0)))
+  true)
+
 (define
   er-eval-test-summary
   (str "eval " er-eval-test-pass "/" er-eval-test-count))