add: assigment 2

assignment2/part2/test

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+echo "Building executable..."
+
+cd "${FLAKE:-$(dirname $0)}"
+if command -v nix; then
+    bidirectional="$(nix build --no-link --print-out-paths .#a2-p2-bidirectional)/bin/bidirectional"
+else
+    gcc bidirectional.c -o bidirectional
+    bidirectional="./bidirectional"
+fi
+
+out="$("$bidirectional")"
+read -r -d '' expected <<EOF
+Sending message from parent to child
+Response from child to parent
+EOF
+if test "$out" = "$expected"; then
+    echo "SUCCESS"
+fi