From ca990cd130aac89239b435c9548e31fb8db93a29 Mon Sep 17 00:00:00 2001
From: Shen-Ta Hsieh <ibmibmibm.tw@gmail.com>
Date: Thu, 1 Oct 2026 12:19:39 +0800
Subject: [PATCH] Lower the cos test tolerance and fix the asin test seed

The random cos test now uses 16 float eps, the same as the sin test
in #1479. Over 200000 random points the largest cos error is 5 eps.

The asin edge test now seeds its generator with a fixed value
instead of the clock, so a failure is reproducible.
---
 test/test_asin.cpp    | 28 +---------------------------
 test/test_sin_cos.cpp |  2 +-
 2 files changed, 2 insertions(+), 28 deletions(-)

diff --git a/test/test_asin.cpp b/test/test_asin.cpp
index 9d4fe0cc5..d5d372029 100644
--- a/test/test_asin.cpp
+++ b/test/test_asin.cpp
@@ -32,7 +32,6 @@
 #include <boost/math/special_functions/next.hpp>
 #include <boost/core/lightweight_test.hpp>
 
-#include <chrono>
 #include <cmath>
 #include <random>
 
@@ -49,28 +48,6 @@ using namespace boost::decimal;
 template<typename T> auto my_zero() -> T;
 template<typename T> auto my_one () -> T;
 
-namespace local
-{
-  template<typename IntegralTimePointType,
-           typename ClockType = std::chrono::high_resolution_clock>
-  auto time_point() noexcept -> IntegralTimePointType
-  {
-    using local_integral_time_point_type = IntegralTimePointType;
-    using local_clock_type               = ClockType;
-
-    const auto current_now =
-      static_cast<std::uintmax_t>
-      (
-        std::chrono::duration_cast<std::chrono::nanoseconds>
-        (
-          local_clock_type::now().time_since_epoch()
-        ).count()
-      );
-
-    return static_cast<local_integral_time_point_type>(current_now);
-  }
-} // namespace local
-
 template <typename Dec>
 void test_asin()
 {
@@ -203,10 +180,7 @@ auto test_asin_edge() -> void
     using namespace boost::decimal::literals;
     const T half_pi { static_cast<T>(1.570796326794896619231321691639751_DL) };
 
-    std::random_device rd;
-    std::mt19937_64 gen(rd());
-
-    gen.seed(local::time_point<typename std::mt19937_64::result_type>());
+    std::mt19937_64 gen(42);
 
     auto dis =
       std::uniform_real_distribution<float>
diff --git a/test/test_sin_cos.cpp b/test/test_sin_cos.cpp
index 2e56f65fa..fc70281c9 100644
--- a/test/test_sin_cos.cpp
+++ b/test/test_sin_cos.cpp
@@ -107,7 +107,7 @@ auto test_cos() -> void
         auto ret_val {std::cos(val1)};
         auto ret_dec {static_cast<float>(cos(d1))};
 
-        if (!BOOST_TEST(std::fabs(ret_val - ret_dec) < 35*std::numeric_limits<float>::epsilon()))
+        if (!BOOST_TEST(std::fabs(ret_val - ret_dec) < 16*std::numeric_limits<float>::epsilon()))
         {
             // LCOV_EXCL_START
             std::cerr << "Val 1: " << val1