test: add tests for main() argument handling

This test provides missing coverage for __wasi_args_get() and
__wasi_args_sizes_get(), which translate to argc and argv in
WASI applications.

PR-URL: https://github.com/nodejs/node/pull/31426
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

test/wasi/c/main_args.c

@@ -0,0 +1,10 @@
+#include <assert.h>
+#include <string.h>
+
+int main(int argc, char** argv) {
+  assert(argc == 3);
+  assert(0 == strcmp(argv[0], "foo"));
+  assert(0 == strcmp(argv[1], "-bar"));
+  assert(0 == strcmp(argv[2], "--baz=value"));
+  return 0;
+}

test/wasi/test-wasi.js

@@ -15,7 +15,7 @@ if (process.argv[2] === 'wasi-child') {
   tmpdir.refresh();
   const wasmDir = path.join(__dirname, 'wasm');
   const wasi = new WASI({
-    args: [],
+    args: ['foo', '-bar', '--baz=value'],
     env: process.env,
     preopens: {
       '/sandbox': fixtures.path('wasi'),
@@ -64,6 +64,7 @@ if (process.argv[2] === 'wasi-child') {
   runWASI({ test: 'getentropy' });
   runWASI({ test: 'getrusage' });
   runWASI({ test: 'gettimeofday' });
+  runWASI({ test: 'main_args' });
   runWASI({ test: 'notdir' });
   // runWASI({ test: 'poll' });
   runWASI({ test: 'preopen_populates' });