testing: Implement Macros For Cli Testing

Signed-off-by: Will Hawkins <hawkinsw@obs.cr>

Tests/p4rseTests/CliTests/Cli.swift

@@ -0,0 +1,26 @@
+// p4rse, Copyright 2026, Will Hawkins
+//
+// This file is part of p4rse.
+//
+// This file is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import Foundation
+import Testing
+
+/// Success
+/// 
+@CliTest()
+func simple_cli_test() -> [String] {
+    return ["p4ce", "--plain", "compile", "simple.p4", "-I", "TestData/Sources/"]
+}