add malloc_info test

test/malloc_info.c

@@ -0,0 +1,28 @@
+#include <pthread.h>
+
+#include <malloc.h>
+
+__attribute__((optimize(0)))
+void leak_memory(void) {
+    (void)malloc(1024 * 1024 * 1024);
+    (void)malloc(16);
+    (void)malloc(32);
+    (void)malloc(4096);
+}
+
+void *do_work(void *p) {
+    leak_memory();
+    return NULL;
+}
+
+int main(void) {
+    pthread_t thread[4];
+    for (int i = 0; i < 4; i++) {
+        pthread_create(&thread[i], NULL, do_work, NULL);
+    }
+    for (int i = 0; i < 4; i++) {
+        pthread_join(thread[i], NULL);
+    }
+
+    malloc_info(0, stdout);
+}