Update.

test/pexpect/isalive_test.wren

@@ -0,0 +1,15 @@
+// retoor <retoor@molodetz.nl>
+// nontest
+
+import "pexpect" for Spawn
+import "timer" for Timer
+
+System.print("Creating child")
+var child = Spawn.new("echo test")
+System.print("Child created, pid: %(child.pid)")
+System.print("isalive: %(child.isalive)")
+Timer.sleep(500)
+System.print("After sleep, isalive: %(child.isalive)")
+System.print("buffer: [%(child.buffer)]")
+child.close()
+System.print("Done")