/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-â
âvi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :viâ
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â Copyright 2021 Justine Alexandra Roberts Tunney                              â
â                                                                              â
â Permission to use, copy, modify, and/or distribute this software for         â
â any purpose with or without fee is hereby granted, provided that the         â
â above copyright notice and this permission notice appear in all copies.      â
â                                                                              â
â THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                â
â WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                â
â WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             â
â AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         â
â DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        â
â PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               â
â TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             â
â PERFORMANCE OF THIS SOFTWARE.                                                â
ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ*/
#include "libc/math.h"
#include "libc/mem/gc.h"
#include "libc/testlib/testlib.h"
#include "libc/x/xasprintf.h"

TEST(tgamma, test) {
  EXPECT_STREQ("inf", _gc(xasprintf("%.15g", tgamma(0.))));
  EXPECT_STREQ("-inf", _gc(xasprintf("%.15g", tgamma(-0.))));
  EXPECT_STREQ("9.51350769866873", _gc(xasprintf("%.15g", tgamma(.1))));
  EXPECT_STREQ("-10.6862870211932", _gc(xasprintf("%.15g", tgamma(-.1))));
  EXPECT_STREQ("1.77245385090552", _gc(xasprintf("%.15g", tgamma(.5))));
  EXPECT_STREQ("-3.54490770181103", _gc(xasprintf("%.15g", tgamma(-.5))));
  EXPECT_STREQ("1", _gc(xasprintf("%.15g", tgamma(1.))));
  EXPECT_TRUE(isnan(tgamma(-1.)));
  EXPECT_STREQ("0.886226925452758", _gc(xasprintf("%.15g", tgamma(1.5))));
  EXPECT_STREQ("2.36327180120735", _gc(xasprintf("%.15g", tgamma(-1.5))));
  EXPECT_STREQ("1", _gc(xasprintf("%.15g", tgamma(2.))));
  EXPECT_TRUE(isnan(tgamma(NAN)));
  EXPECT_TRUE(isnan(tgamma(-NAN)));
  EXPECT_STREQ("inf", _gc(xasprintf("%.15g", tgamma(INFINITY))));
  EXPECT_TRUE(isnan(tgamma(-INFINITY)));
  EXPECT_STREQ("4.49423283715579e+307",
               _gc(xasprintf("%.15g", tgamma(__DBL_MIN__))));
  EXPECT_STREQ("inf", _gc(xasprintf("%.15g", tgamma(__DBL_MAX__))));
  EXPECT_STREQ("4.5035996273705e+15",
               _gc(xasprintf("%.14g", tgamma(-1.0000000000000002))));
  EXPECT_STREQ("-47453133.3893415",
               _gc(xasprintf("%.15g", tgamma(-2.1073424255447e-08))));
}
