From 1a77755a54cd3bc9bb415dbea8e75d39cb394968 Mon Sep 17 00:00:00 2001
From: Nicholas Clark <nick@ccl4.org>
Date: Thu, 8 Sep 2011 16:08:16 +0200
Subject: [PATCH] Further tests for POSIX trigonometric and hyperbolic
 functions.

---
 ext/POSIX/t/math.t | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/ext/POSIX/t/math.t b/ext/POSIX/t/math.t
index e04cc30..bf0c2de 100644
--- a/ext/POSIX/t/math.t
+++ b/ext/POSIX/t/math.t
@@ -3,17 +3,37 @@
 use strict;
 
 use POSIX;
-use Test::More tests => 14;
+use Test::More;
 
 # These tests are mainly to make sure that these arithmetic functions
 # exist and are accessible.  They are not meant to be an exhaustive
 # test for the interface.
 
+sub between {
+    my ($low, $have, $high, $desc) = @_;
+    local $Test::Builder::Level = $Test::Builder::Level + 1;
+
+    cmp_ok($have, '>=', $low, $desc);
+    cmp_ok($have, '<=', $high, $desc);
+}
+
 is(acos(1), 0, "Basic acos(1) test");
+between(3.14, acos(-1), 3.15, 'acos(-1)');
+between(1.57, acos(0), 1.58, 'acos(0)');
 is(asin(0), 0, "Basic asin(0) test");
+cmp_ok(asin(1), '>', 1.57, "Basic asin(1) test");
+cmp_ok(asin(-1), '<', -1.57, "Basic asin(-1) test");
+cmp_ok(asin(1), '==', -asin(-1), 'asin(1) == -asin(-1)');
 is(atan(0), 0, "Basic atan(0) test");
+between(0.785, atan(1), 0.786, 'atan(1)');
+between(-0.786, atan(-1), -0.785, 'atan(-1)');
+cmp_ok(atan(1), '==', -atan(-1), 'atan(1) == -atan(-1)');
 is(cosh(0), 1, "Basic cosh(0) test");  
+between(1.54, cosh(1), 1.55, 'cosh(1)');
+between(1.54, cosh(-1), 1.55, 'cosh(-1)');
+is(cosh(1), cosh(-1), 'cosh(1) == cosh(-1)');
 is(floor(1.23441242), 1, "Basic floor(1.23441242) test");
+is(floor(-1.23441242), -2, "Basic floor(-1.23441242) test");
 is(fmod(3.5, 2.0), 1.5, "Basic fmod(3.5, 2.0) test");
 is(join(" ", frexp(1)), "0.5 1",  "Basic frexp(1) test");
 is(ldexp(0,1), 0, "Basic ldexp(0,1) test");
@@ -21,5 +41,15 @@ is(log10(1), 0, "Basic log10(1) test");
 is(log10(10), 1, "Basic log10(10) test");
 is(join(" ", modf(1.76)), "0.76 1", "Basic modf(1.76) test");
 is(sinh(0), 0, "Basic sinh(0) test"); 
+between(1.17, sinh(1), 1.18, 'sinh(1)');
+between(-1.18, sinh(-1), -1.17, 'sinh(-1)');
 is(tan(0), 0, "Basic tan(0) test");
+between(1.55, tan(1), 1.56, 'tan(1)');
+between(1.55, tan(1), 1.56, 'tan(-1)');
+cmp_ok(tan(1), '==', -tan(-1), 'tan(1) == -tan(-1)');
 is(tanh(0), 0, "Basic tanh(0) test"); 
+between(0.76, tanh(1), 0.77, 'tanh(1)');
+between(-0.77, tanh(-1), -0.76, 'tanh(-1)');
+cmp_ok(tanh(1), '==', -tanh(-1), 'tanh(1) == -tanh(-1)');
+
+done_testing();
-- 
2.7.4