Add test for #native

tests/native_test.c

@@ -0,0 +1,14 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+// Build with
+// cc -shared -fPIC native_test.c -o native_test.so
+// or
+// cc -shared -fPIC native_test.c -o native_test.dll
+
+int labashka(unsigned short (*pop)(void), void (*push)(unsigned short), size_t (*len)(void), size_t max_size ) {
+    printf("At %zu, there's %d.\n", len(), pop());
+    push(12);
+    printf("Maximum size is %zu.\n", max_size);
+    return 0;   
+}

tests/native_test.lb

@@ -0,0 +1,3 @@
+@ 0
+ push -1
+ #native native_test