link libc in tests

build.zig

@@ -57,6 +57,7 @@ pub fn build(b: *std.Build) !void {
         .root_source_file = .{ .path = "src/test.zig" },
         .optimize = optimize,
         .target = target,
+        .link_libc = true,
     });
     const run_tests = b.addRunArtifact(tests);
     test_step.dependOn(&run_tests.step);