This is xnu-12377.1.9. See this file in:
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#include "std_safe.h"
#include "dt_proxy.h"
#include <darwintest.h>

static void
pt_assert_true(bool cond, const char *msg)
{
	T_ASSERT_TRUE(cond, "%s", msg);
}
static void
pt_assert_notnull(void *ptr, const char *msg)
{
	T_ASSERT_NOTNULL(ptr, "%s", msg);
}
static void
pt_assert_posix_zero(int v, const char *msg)
{
	T_ASSERT_POSIX_ZERO(v, "%s", msg);
}
static void
pt_log(const char *msg)
{
	T_LOG("%s", msg);
}
static void
pt_log_fmtstr(const char* fmt, const char *msg)
{
	T_LOG(fmt, msg);
}
static void
pt_fail(const char *msg)
{
	T_FAIL("%s", msg);
}
static void
pt_quiet(void)
{
	T_QUIET;
}

static struct dt_proxy_callbacks dt_callbacks = {
	.t_assert_true = &pt_assert_true,
	.t_assert_notnull = &pt_assert_notnull,
	.t_assert_posix_zero = &pt_assert_posix_zero,
	.t_log = &pt_log,
	.t_log_fmtstr = &pt_log_fmtstr,
	.t_fail = &pt_fail,
	.t_quiet = &pt_quiet
};

// This code is linked into every test executable to allow the XNU and mocks .dylibs access to some
// darwintest functionality.  libdarwintest.a is only linked to the executable so code in the XNU and
// mocks .dylibs can't call into it directly
// due to how dyld works, this constructor is going to be called after the fake_kinit() constructor
// so during fake_kinit() dt_proxy is going to stay NULL and any output to darwintest asserts is lost.
__attribute__((constructor)) void
dt_init(void)
{
	set_dt_proxy_attached(&dt_callbacks);
	set_dt_proxy_mock(&dt_callbacks);
}