test: improve wasi stat test

This commit improved the stat test a bit by verifying that S_ISDIR() works properly. It also adds missing coverage for __wasi_path_remove_directory(). PR-URL: #31413 Reviewed-By: Chengzhong Wu <[email protected]> Reviewed-By: David Carlier <[email protected]> Reviewed-By: Daijiro Wachi <[email protected]> Reviewed-By: Beth Griggs <[email protected]> Reviewed-By: Rich Trott <[email protected]>

Author: cjihrig

test/wasi/c/stat.c

@@ -49,5 +49,15 @@ int main(void){
 ret=stat(PATH, &st);
 assert(ret==-1);
 
+ret=stat(OUTPUT_DIR, &st);
+assert(ret==0);
+assert(S_ISDIR(st.st_mode));
+
+ret=rmdir(OUTPUT_DIR);
+assert(ret==0);
+
+ret=stat(OUTPUT_DIR, &st);
+assert(ret==-1);
+
 return0;
 }