Add stdio test

tests/stdio_client.nim

@@ -0,0 +1,42 @@
+# SPDX-FileCopyrightText: ☭ 2021 Emery Hemingway
+# SPDX-License-Identifier: Unlicense
+
+import std/[asyncdispatch, random]
+import preserves
+import syndicate
+
+import syndicate/[actors, capabilities]
+
+randomize()
+
+proc mint(): SturdyRef =
+  var key: array[16, byte]
+  mint(key, "syndicate")
+
+type
+  A* {.preservesRecord: "A".} = object
+    str*: string
+  B* {.preservesRecord: "B".} = object
+    str*: string
+
+bootDataspace("x") do (ds: Ref; turn: var Turn):
+  connectStdio(ds, turn)
+
+  discard publish(turn, ds, A(str: "A stdio"))
+  discard publish(turn, ds, B(str: "B stdio"))
+
+  onPublish(turn, ds, ?A) do (v: Assertion):
+    stderr.writeLine "received over stdio ", v
+
+bootDataspace("y") do (ds: Ref; turn: var Turn):
+
+  connectUnix(turn, "/run/user/1000/dataspace", mint()) do (turn: var Turn; a: Assertion) -> TurnAction:
+    let ds = unembed a
+
+    discard publish(turn, ds, A(str: "A unix"))
+    discard publish(turn, ds, B(str: "B unix"))
+
+    onPublish(turn, ds, ?B) do (v: Assertion):
+      stderr.writeLine "received over unix ", v
+
+runForever()