1const std = @import("std");
 2const expect = std.testing.expect;
 3
 4extern fn add(a: u32, b: u32) u32;
 5extern var foo: u32;
 6
 7test "C add" {
 8    const result = add(1, 2);
 9    try expect(result == 3);
10}
11
12test "C extern variable" {
13    try expect(foo == 12345);
14}