add test for creating directories at cwd

tests/wasix/create-dir-at-cwd/main.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+int main() {
+    int status = EXIT_FAILURE;
+
+    const char *dirName1 = "test1";
+    if (mkdir(dirName1, 0755) != 0) {
+        goto end;
+    }
+
+    const char *dirName2 = "./test2";
+    if (mkdir(dirName2, 0755) != 0) {
+        goto end;
+    }
+
+    status = EXIT_SUCCESS;
+
+end:
+    printf("%d", status);
+    return 0;
+}

tests/wasix/create-dir-at-cwd/run.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+$WASMER -q run main.wasm --dir . > output
+
+rmdir test1 test2 2>/dev/null && printf "0" | diff -u output - 1>/dev/null