diff --git a/libc/test/src/fenv/exception_status_test.cpp b/libc/test/src/fenv/exception_status_test.cpp
@@ -13,24 +13,23 @@
 #include "src/fenv/fetestexcept.h"
 
 #include "src/__support/FPUtil/FEnvImpl.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/fenv_macros.h"
 
-TEST(LlvmLibcExceptionStatusTest, RaiseAndTest) {
+#include "excepts.h"
+
+using LlvmLibcExceptionStatusTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
+
+TEST_F(LlvmLibcExceptionStatusTest, RaiseAndTest) {
   // This test raises a set of exceptions and checks that the exception
   // status flags are updated. The intention is really not to invoke the
   // exception handler. Hence, we will disable all exceptions at the
   // beginning.
   LIBC_NAMESPACE::fputil::disable_except(FE_ALL_EXCEPT);
 
-  int excepts[] = {FE_DIVBYZERO, FE_INVALID, FE_INEXACT, FE_OVERFLOW,
-                   FE_UNDERFLOW};
-
-  constexpr int ALL_EXCEPTS =
-      FE_DIVBYZERO | FE_INVALID | FE_INEXACT | FE_OVERFLOW | FE_UNDERFLOW;
-
-  for (int e : excepts) {
+  for (int e : EXCEPTS) {
     int r = LIBC_NAMESPACE::feraiseexcept(e);
     ASSERT_EQ(r, 0);
     int s = LIBC_NAMESPACE::fetestexcept(e);
@@ -47,8 +46,8 @@ TEST(LlvmLibcExceptionStatusTest, RaiseAndTest) {
     ASSERT_EQ(s, e);
   }
 
-  for (int e1 : excepts) {
-    for (int e2 : excepts) {
+  for (int e1 : EXCEPTS) {
+    for (int e2 : EXCEPTS) {
       int e = e1 | e2;
       int r = LIBC_NAMESPACE::feraiseexcept(e);
       ASSERT_EQ(r, 0);
@@ -67,9 +66,9 @@ TEST(LlvmLibcExceptionStatusTest, RaiseAndTest) {
     }
   }
 
-  for (int e1 : excepts) {
-    for (int e2 : excepts) {
-      for (int e3 : excepts) {
+  for (int e1 : EXCEPTS) {
+    for (int e2 : EXCEPTS) {
+      for (int e3 : EXCEPTS) {
         int e = e1 | e2 | e3;
         int r = LIBC_NAMESPACE::feraiseexcept(e);
         ASSERT_EQ(r, 0);
@@ -89,10 +88,10 @@ TEST(LlvmLibcExceptionStatusTest, RaiseAndTest) {
     }
   }
 
-  for (int e1 : excepts) {
-    for (int e2 : excepts) {
-      for (int e3 : excepts) {
-        for (int e4 : excepts) {
+  for (int e1 : EXCEPTS) {
+    for (int e2 : EXCEPTS) {
+      for (int e3 : EXCEPTS) {
+        for (int e4 : EXCEPTS) {
           int e = e1 | e2 | e3 | e4;
           int r = LIBC_NAMESPACE::feraiseexcept(e);
           ASSERT_EQ(r, 0);
@@ -113,11 +112,11 @@ TEST(LlvmLibcExceptionStatusTest, RaiseAndTest) {
     }
   }
 
-  for (int e1 : excepts) {
-    for (int e2 : excepts) {
-      for (int e3 : excepts) {
-        for (int e4 : excepts) {
-          for (int e5 : excepts) {
+  for (int e1 : EXCEPTS) {
+    for (int e2 : EXCEPTS) {
+      for (int e3 : EXCEPTS) {
+        for (int e4 : EXCEPTS) {
+          for (int e5 : EXCEPTS) {
             int e = e1 | e2 | e3 | e4 | e5;
             int r = LIBC_NAMESPACE::feraiseexcept(e);
             ASSERT_EQ(r, 0);

diff --git a/libc/test/src/fenv/excepts.h b/libc/test/src/fenv/excepts.h
@@ -0,0 +1,24 @@
+//===-- List of all FE_* constants for tests -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TEST_SRC_FENV_EXCEPTS_H
+#define LLVM_LIBC_TEST_SRC_FENV_EXCEPTS_H
+
+#include "hdr/fenv_macros.h"
+
+constexpr int EXCEPTS[] = {
+    FE_DIVBYZERO, FE_INVALID, FE_INEXACT, FE_OVERFLOW, FE_UNDERFLOW,
+};
+
+// We '|' the individual exception flags instead of using FE_ALL_EXCEPT
+// as it can include non-standard extensions. Note that we should be able
+// to compile this file with headers from other libcs as well.
+constexpr int ALL_EXCEPTS =
+    FE_DIVBYZERO | FE_INVALID | FE_INEXACT | FE_OVERFLOW | FE_UNDERFLOW;
+
+#endif // LLVM_LIBC_TEST_SRC_FENV_EXCEPTS_H
diff --git a/libc/test/src/fenv/feclearexcept_test.cpp b/libc/test/src/fenv/feclearexcept_test.cpp
@@ -9,27 +9,30 @@
 #include "src/fenv/feclearexcept.h"
 
 #include "src/__support/FPUtil/FEnvImpl.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/fenv_macros.h"
 #include <stdint.h>
 
-TEST(LlvmLibcFEnvTest, ClearTest) {
-  uint16_t excepts[] = {FE_DIVBYZERO, FE_INVALID, FE_INEXACT, FE_OVERFLOW,
-                        FE_UNDERFLOW};
+#include "excepts.h"
+
+using LlvmLibcFEnvTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
+
+TEST_F(LlvmLibcFEnvTest, ClearTest) {
   LIBC_NAMESPACE::fputil::disable_except(FE_ALL_EXCEPT);
   LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
 
-  for (uint16_t e : excepts)
+  for (int e : EXCEPTS)
     ASSERT_EQ(LIBC_NAMESPACE::fputil::test_except(e), 0);
 
   LIBC_NAMESPACE::fputil::raise_except(FE_ALL_EXCEPT);
 
-  for (uint16_t e1 : excepts) {
-    for (uint16_t e2 : excepts) {
-      for (uint16_t e3 : excepts) {
-        for (uint16_t e4 : excepts) {
-          for (uint16_t e5 : excepts) {
+  for (int e1 : EXCEPTS) {
+    for (int e2 : EXCEPTS) {
+      for (int e3 : EXCEPTS) {
+        for (int e4 : EXCEPTS) {
+          for (int e5 : EXCEPTS) {
             // We clear one exception and test to verify that it was cleared.
             LIBC_NAMESPACE::feclearexcept(e1 | e2 | e3 | e4 | e5);
             ASSERT_EQ(

diff --git a/libc/test/src/fenv/feenableexcept_test.cpp b/libc/test/src/fenv/feenableexcept_test.cpp
@@ -11,11 +11,16 @@
 #include "src/fenv/feenableexcept.h"
 #include "src/fenv/fegetexcept.h"
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/fenv_macros.h"
 
-TEST(LlvmLibcFEnvTest, EnableTest) {
+#include "excepts.h"
+
+using LlvmLibcFEnvTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
+
+TEST_F(LlvmLibcFEnvTest, EnableTest) {
 #if defined(LIBC_TARGET_ARCH_IS_ANY_ARM) ||                                    \
     defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
   // Few Arm HW implementations do not trap exceptions. We skip this test

diff --git a/libc/test/src/fenv/feholdexcept_test.cpp b/libc/test/src/fenv/feholdexcept_test.cpp
@@ -11,10 +11,15 @@
 
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/macros/properties/architectures.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPExceptMatcher.h"
 #include "test/UnitTest/Test.h"
 
-TEST(LlvmLibcFEnvTest, RaiseAndCrash) {
+#include "excepts.h"
+
+using LlvmLibcFEnvTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
+
+TEST_F(LlvmLibcFEnvTest, RaiseAndCrash) {
 #if defined(LIBC_TARGET_ARCH_IS_ANY_ARM) ||                                    \
     defined(LIBC_TARGET_ARCH_IS_ANY_RISCV)
   // Few Arm HW implementations do not trap exceptions. We skip this test

diff --git a/libc/test/src/fenv/feupdateenv_test.cpp b/libc/test/src/fenv/feupdateenv_test.cpp
@@ -10,11 +10,12 @@
 #include "src/fenv/feupdateenv.h"
 
 #include "src/__support/FPUtil/FEnvImpl.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
-#include <signal.h>
+using LlvmLibcFEnvTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
 
-TEST(LlvmLibcFEnvTest, UpdateEnvTest) {
+TEST_F(LlvmLibcFEnvTest, UpdateEnvTest) {
   LIBC_NAMESPACE::fputil::disable_except(FE_ALL_EXCEPT);
   LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
 

diff --git a/libc/test/src/fenv/getenv_and_setenv_test.cpp b/libc/test/src/fenv/getenv_and_setenv_test.cpp
@@ -13,17 +13,19 @@
 #include "src/fenv/fesetround.h"
 
 #include "src/__support/FPUtil/FEnvImpl.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
-TEST(LlvmLibcFenvTest, GetEnvAndSetEnv) {
+#include "excepts.h"
+
+using LlvmLibcFEnvTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
+
+TEST_F(LlvmLibcFEnvTest, GetEnvAndSetEnv) {
   // We will disable all exceptions to prevent invocation of the exception
   // handler.
   LIBC_NAMESPACE::fputil::disable_except(FE_ALL_EXCEPT);
 
-  int excepts[] = {FE_DIVBYZERO, FE_INVALID, FE_INEXACT, FE_OVERFLOW,
-                   FE_UNDERFLOW};
-
-  for (int e : excepts) {
+  for (int e : EXCEPTS) {
     LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
 
     // Save the cleared environment.
@@ -71,7 +73,7 @@ TEST(LlvmLibcFenvTest, Set_FE_DFL_ENV) {
 }
 
 #ifdef _WIN32
-TEST(LlvmLibcFenvTest, Windows_Set_Get_Test) {
+TEST_F(LlvmLibcFEnvTest, Windows_Set_Get_Test) {
   // If a valid fenv_t is written, then reading it back out should be identical.
   fenv_t setEnv = {0x7e00053e, 0x0f00000f};
   fenv_t getEnv;

diff --git a/libc/test/src/fenv/rounding_mode_test.cpp b/libc/test/src/fenv/rounding_mode_test.cpp
@@ -9,15 +9,18 @@
 #include "src/fenv/fegetround.h"
 #include "src/fenv/fesetround.h"
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/fenv_macros.h"
 
-TEST(LlvmLibcRoundingModeTest, SetAndGet) {
+using LlvmLibcRoundingModeTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
+
+TEST_F(LlvmLibcRoundingModeTest, SetAndGet) {
   struct ResetDefaultRoundingMode {
-    int original;
+    int original = LIBC_NAMESPACE::fegetround();
     ~ResetDefaultRoundingMode() { LIBC_NAMESPACE::fesetround(original); }
-  } reset{LIBC_NAMESPACE::fegetround()};
+  } reset;
 
   int s = LIBC_NAMESPACE::fesetround(FE_TONEAREST);
   EXPECT_EQ(s, 0);

diff --git a/libc/test/src/math/CeilTest.h b/libc/test/src/math/CeilTest.h
@@ -6,6 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -14,7 +15,8 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class CeilTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class CeilTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/CopySignTest.h b/libc/test/src/math/CopySignTest.h
@@ -6,6 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -15,7 +16,7 @@
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
 template <typename T>
-class CopySignTest : public LIBC_NAMESPACE::testing::Test {
+class CopySignTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/FAbsTest.h b/libc/test/src/math/FAbsTest.h
@@ -9,6 +9,7 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_FABSTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_FABSTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -17,7 +18,8 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class FAbsTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class FAbsTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/FDimTest.h b/libc/test/src/math/FDimTest.h
@@ -9,11 +9,12 @@
 #include "hdr/math_macros.h"
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FDimTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class FDimTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   using FuncPtr = T (*)(T, T);
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;

diff --git a/libc/test/src/math/FMaxTest.h b/libc/test/src/math/FMaxTest.h
@@ -9,6 +9,7 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_FMAXTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_FMAXTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -17,7 +18,8 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class FMaxTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class FMaxTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/FMinTest.h b/libc/test/src/math/FMinTest.h
@@ -9,6 +9,7 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_FMINTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_FMINTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -17,7 +18,8 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class FMinTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class FMinTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/FModTest.h b/libc/test/src/math/FModTest.h
@@ -11,6 +11,7 @@
 
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/NearestIntegerOperations.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
@@ -24,7 +25,8 @@
 
 #define TEST_REGULAR(x, y, expected) TEST_SPECIAL(x, y, expected, false, 0)
 
-template <typename T> class FmodTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class FmodTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/FloorTest.h b/libc/test/src/math/FloorTest.h
@@ -9,6 +9,7 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_FLOORTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_FLOORTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -17,7 +18,8 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class FloorTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class FloorTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/FmaTest.h b/libc/test/src/math/FmaTest.h
@@ -12,14 +12,15 @@
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/stdlib/rand.h"
 #include "src/stdlib/srand.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
 template <typename T>
-class FmaTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class FmaTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 private:
   using Func = T (*)(T, T, T);
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;

diff --git a/libc/test/src/math/FrexpTest.h b/libc/test/src/math/FrexpTest.h
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/FPUtil/BasicOperations.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -15,7 +16,8 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class FrexpTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class FrexpTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/HypotTest.h b/libc/test/src/math/HypotTest.h
@@ -10,6 +10,7 @@
 #define LLVM_LIBC_TEST_SRC_MATH_HYPOTTEST_H
 
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -19,7 +20,7 @@
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
 template <typename T>
-class HypotTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class HypotTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 private:
   using Func = T (*)(T, T);
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;

diff --git a/libc/test/src/math/ILogbTest.h b/libc/test/src/math/ILogbTest.h
@@ -13,9 +13,10 @@
 #include "src/__support/CPP/limits.h" // INT_MAX
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
-class LlvmLibcILogbTest : public LIBC_NAMESPACE::testing::Test {
+class LlvmLibcILogbTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   template <typename T> struct ILogbFunc {
     typedef int (*Func)(T);

diff --git a/libc/test/src/math/LdExpTest.h b/libc/test/src/math/LdExpTest.h
@@ -12,14 +12,15 @@
 #include "src/__support/CPP/limits.h" // INT_MAX
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/NormalFloat.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 #include <stdint.h>
 
 template <typename T>
-class LdExpTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class LdExpTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using NormalFloat = LIBC_NAMESPACE::fputil::NormalFloat<T>;
   using StorageType = typename FPBits::StorageType;

diff --git a/libc/test/src/math/LogbTest.h b/libc/test/src/math/LogbTest.h
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -15,7 +16,8 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class LogbTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class LogbTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/ModfTest.h b/libc/test/src/math/ModfTest.h
@@ -8,6 +8,7 @@
 
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/NearestIntegerOperations.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -16,7 +17,8 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class ModfTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class ModfTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/NextAfterTest.h b/libc/test/src/math/NextAfterTest.h
@@ -14,11 +14,12 @@
 #include "src/__support/CPP/type_traits.h"
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class NextAfterTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class NextAfterTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using StorageType = typename FPBits::StorageType;
 

diff --git a/libc/test/src/math/RIntTest.h b/libc/test/src/math/RIntTest.h
@@ -11,6 +11,7 @@
 
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -25,7 +26,7 @@ static constexpr int ROUNDING_MODES[4] = {FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO,
                                           FE_TONEAREST};
 
 template <typename T>
-class RIntTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class RIntTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   typedef T (*RIntFunc)(T);
 

diff --git a/libc/test/src/math/RemQuoTest.h b/libc/test/src/math/RemQuoTest.h
@@ -12,14 +12,15 @@
 #include "hdr/math_macros.h"
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
 template <typename T>
-class RemQuoTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class RemQuoTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using StorageType = typename FPBits::StorageType;
 

diff --git a/libc/test/src/math/RoundEvenTest.h b/libc/test/src/math/RoundEvenTest.h
@@ -9,6 +9,7 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_ROUNDEVENTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_ROUNDEVENTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -18,7 +19,7 @@
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
 template <typename T>
-class RoundEvenTest : public LIBC_NAMESPACE::testing::Test {
+class RoundEvenTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/RoundTest.h b/libc/test/src/math/RoundTest.h
@@ -9,6 +9,7 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_ROUNDTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_ROUNDTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -17,7 +18,8 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class RoundTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class RoundTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/RoundToIntegerTest.h b/libc/test/src/math/RoundToIntegerTest.h
@@ -11,6 +11,7 @@
 
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -24,7 +25,8 @@ static constexpr int ROUNDING_MODES[4] = {FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO,
                                           FE_TONEAREST};
 
 template <typename F, typename I, bool TestModes = false>
-class RoundToIntegerTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class RoundToIntegerTestTemplate
+    : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   typedef I (*RoundToIntegerFunc)(F);
 
@@ -81,6 +83,8 @@ class RoundToIntegerTestTemplate : public LIBC_NAMESPACE::testing::Test {
 
 public:
   void SetUp() override {
+    LIBC_NAMESPACE::testing::FEnvSafeTest::SetUp();
+
     if (math_errhandling & MATH_ERREXCEPT) {
       // We will disable all exceptions so that the test will not
       // crash with SIGFPE. We can still use fetestexcept to check

diff --git a/libc/test/src/math/SqrtTest.h b/libc/test/src/math/SqrtTest.h
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/CPP/bit.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -15,7 +16,8 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class SqrtTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class SqrtTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/TruncTest.h b/libc/test/src/math/TruncTest.h
@@ -9,6 +9,7 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_TRUNCTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_TRUNCTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -17,7 +18,8 @@
 
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
-template <typename T> class TruncTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class TruncTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/exhaustive/fmod_generic_impl_test.cpp b/libc/test/src/math/exhaustive/fmod_generic_impl_test.cpp
@@ -9,6 +9,7 @@
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/ManipulationFunctions.h" // ldexp
 #include "src/__support/FPUtil/generic/FMod.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
@@ -18,7 +19,7 @@
 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
 
 template <typename T, bool InverseMultiplication>
-class LlvmLibcFModTest : public LIBC_NAMESPACE::testing::Test {
+class LlvmLibcFModTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using U = typename FPBits::StorageType;

diff --git a/libc/test/src/math/smoke/CanonicalizeTest.h b/libc/test/src/math/smoke/CanonicalizeTest.h
@@ -11,6 +11,7 @@
 
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/integer_literals.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
@@ -26,7 +27,7 @@
 using LIBC_NAMESPACE::operator""_u128;
 
 template <typename T>
-class CanonicalizeTest : public LIBC_NAMESPACE::testing::Test {
+class CanonicalizeTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/CeilTest.h b/libc/test/src/math/smoke/CeilTest.h
@@ -9,12 +9,14 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_SMOKE_CEILTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_CEILTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
-template <typename T> class CeilTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class CeilTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/CopySignTest.h b/libc/test/src/math/smoke/CopySignTest.h
@@ -9,13 +9,14 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_SMOKE_COPYSIGNTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_COPYSIGNTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
 template <typename T>
-class CopySignTest : public LIBC_NAMESPACE::testing::Test {
+class CopySignTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FAbsTest.h b/libc/test/src/math/smoke/FAbsTest.h
@@ -9,12 +9,14 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_SMOKE_FABSTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FABSTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
-template <typename T> class FAbsTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class FAbsTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FDimTest.h b/libc/test/src/math/smoke/FDimTest.h
@@ -8,11 +8,12 @@
 
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FDimTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class FDimTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   using FuncPtr = T (*)(T, T);
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;

diff --git a/libc/test/src/math/smoke/FMaxTest.h b/libc/test/src/math/smoke/FMaxTest.h
@@ -9,10 +9,12 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMAXTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMAXTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
-template <typename T> class FMaxTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class FMaxTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FMaximumMagNumTest.h b/libc/test/src/math/smoke/FMaximumMagNumTest.h
@@ -11,11 +11,12 @@
 
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMaximumMagNumTest : public LIBC_NAMESPACE::testing::Test {
+class FMaximumMagNumTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FMaximumMagTest.h b/libc/test/src/math/smoke/FMaximumMagTest.h
@@ -10,11 +10,12 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMAXIMUM_MAGTEST_H
 
 #include "src/__support/FPUtil/BasicOperations.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMaximumMagTest : public LIBC_NAMESPACE::testing::Test {
+class FMaximumMagTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FMaximumNumTest.h b/libc/test/src/math/smoke/FMaximumNumTest.h
@@ -10,11 +10,12 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMAXIMUMNUMTEST_H
 
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMaximumNumTest : public LIBC_NAMESPACE::testing::Test {
+class FMaximumNumTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FMaximumTest.h b/libc/test/src/math/smoke/FMaximumTest.h
@@ -9,11 +9,12 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMAXIMUMTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMAXIMUMTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMaximumTest : public LIBC_NAMESPACE::testing::Test {
+class FMaximumTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FMinTest.h b/libc/test/src/math/smoke/FMinTest.h
@@ -9,10 +9,12 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMINTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMINTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
-template <typename T> class FMinTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class FMinTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FMinimumMagNumTest.h b/libc/test/src/math/smoke/FMinimumMagNumTest.h
@@ -11,11 +11,12 @@
 
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMinimumMagNumTest : public LIBC_NAMESPACE::testing::Test {
+class FMinimumMagNumTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FMinimumMagTest.h b/libc/test/src/math/smoke/FMinimumMagTest.h
@@ -10,11 +10,12 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMINIMUM_MAGTEST_H
 
 #include "src/__support/FPUtil/BasicOperations.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMinimumMagTest : public LIBC_NAMESPACE::testing::Test {
+class FMinimumMagTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FMinimumNumTest.h b/libc/test/src/math/smoke/FMinimumNumTest.h
@@ -10,11 +10,12 @@
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMINIMUMNUMTEST_H
 
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMinimumNumTest : public LIBC_NAMESPACE::testing::Test {
+class FMinimumNumTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FMinimumTest.h b/libc/test/src/math/smoke/FMinimumTest.h
@@ -9,11 +9,12 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMINIMUMTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FMINIMUMTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FMinimumTest : public LIBC_NAMESPACE::testing::Test {
+class FMinimumTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FModTest.h b/libc/test/src/math/smoke/FModTest.h
@@ -11,6 +11,7 @@
 
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/NearestIntegerOperations.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
@@ -24,7 +25,8 @@
 
 #define TEST_REGULAR(x, y, expected) TEST_SPECIAL(x, y, expected, false, 0)
 
-template <typename T> class FmodTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class FmodTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FloorTest.h b/libc/test/src/math/smoke/FloorTest.h
@@ -9,12 +9,14 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_SMOKE_FLOORTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_FLOORTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
-template <typename T> class FloorTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class FloorTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FmaTest.h b/libc/test/src/math/smoke/FmaTest.h
@@ -10,11 +10,12 @@
 #define LLVM_LIBC_TEST_SRC_MATH_FMATEST_H
 
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FmaTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class FmaTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 private:
   using Func = T (*)(T, T, T);
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;

diff --git a/libc/test/src/math/smoke/FrexpTest.h b/libc/test/src/math/smoke/FrexpTest.h
@@ -7,10 +7,12 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/FPUtil/BasicOperations.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
-template <typename T> class FrexpTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class FrexpTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FromfpTest.h b/libc/test/src/math/smoke/FromfpTest.h
@@ -9,11 +9,12 @@
 #ifndef LIBC_TEST_SRC_MATH_SMOKE_FROMFPTEST_H
 #define LIBC_TEST_SRC_MATH_SMOKE_FROMFPTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FromfpTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class FromfpTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/FromfpxTest.h b/libc/test/src/math/smoke/FromfpxTest.h
@@ -9,11 +9,12 @@
 #ifndef LIBC_TEST_SRC_MATH_SMOKE_FROMFPXTEST_H
 #define LIBC_TEST_SRC_MATH_SMOKE_FROMFPXTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class FromfpxTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class FromfpxTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/HypotTest.h b/libc/test/src/math/smoke/HypotTest.h
@@ -10,13 +10,14 @@
 #define LLVM_LIBC_TEST_SRC_MATH_HYPOTTEST_H
 
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
 template <typename T>
-class HypotTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class HypotTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 private:
   using Func = T (*)(T, T);
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;

diff --git a/libc/test/src/math/smoke/ILogbTest.h b/libc/test/src/math/smoke/ILogbTest.h
@@ -12,10 +12,11 @@
 #include "src/__support/CPP/limits.h" // INT_MAX
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/Test.h"
 
 template <typename OutType, typename InType>
-class LlvmLibcILogbTest : public LIBC_NAMESPACE::testing::Test {
+class LlvmLibcILogbTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<InType>;
   using StorageType = typename FPBits::StorageType;
 

diff --git a/libc/test/src/math/smoke/LdExpTest.h b/libc/test/src/math/smoke/LdExpTest.h
@@ -12,13 +12,14 @@
 #include "src/__support/CPP/limits.h" // INT_MAX
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/FPUtil/NormalFloat.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include <stdint.h>
 
 template <typename T>
-class LdExpTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class LdExpTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using NormalFloat = LIBC_NAMESPACE::fputil::NormalFloat<T>;
   using StorageType = typename FPBits::StorageType;

diff --git a/libc/test/src/math/smoke/LogbTest.h b/libc/test/src/math/smoke/LogbTest.h
@@ -7,10 +7,12 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
-template <typename T> class LogbTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class LogbTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/ModfTest.h b/libc/test/src/math/smoke/ModfTest.h
@@ -8,12 +8,14 @@
 
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/NearestIntegerOperations.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
-template <typename T> class ModfTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class ModfTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/NextAfterTest.h b/libc/test/src/math/smoke/NextAfterTest.h
@@ -14,6 +14,7 @@
 #include "src/__support/CPP/type_traits.h"
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
@@ -29,7 +30,7 @@
   ASSERT_FP_EQ_WITH_EXCEPTION(result, expected, FE_INEXACT | FE_OVERFLOW)
 
 template <typename T>
-class NextAfterTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class NextAfterTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using StorageType = typename FPBits::StorageType;
 

diff --git a/libc/test/src/math/smoke/NextDownTest.h b/libc/test/src/math/smoke/NextDownTest.h
@@ -9,11 +9,12 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_NEXTDOWNTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_NEXTDOWNTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class NextDownTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class NextDownTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/NextTowardTest.h b/libc/test/src/math/smoke/NextTowardTest.h
@@ -15,6 +15,7 @@
 #include "src/__support/CPP/type_traits.h"
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
@@ -30,7 +31,7 @@
   ASSERT_FP_EQ_WITH_EXCEPTION(result, expected, FE_INEXACT | FE_OVERFLOW)
 
 template <typename T>
-class NextTowardTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class NextTowardTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using ToFPBits = LIBC_NAMESPACE::fputil::FPBits<long double>;
   using StorageType = typename FPBits::StorageType;

diff --git a/libc/test/src/math/smoke/NextUpTest.h b/libc/test/src/math/smoke/NextUpTest.h
@@ -9,11 +9,12 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_NEXTUPTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_NEXTUPTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class NextUpTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class NextUpTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/RIntTest.h b/libc/test/src/math/smoke/RIntTest.h
@@ -11,6 +11,7 @@
 
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
@@ -22,7 +23,7 @@ static constexpr int ROUNDING_MODES[4] = {FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO,
                                           FE_TONEAREST};
 
 template <typename T>
-class RIntTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class RIntTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   typedef T (*RIntFunc)(T);
 

diff --git a/libc/test/src/math/smoke/RemQuoTest.h b/libc/test/src/math/smoke/RemQuoTest.h
@@ -12,11 +12,12 @@
 #include "hdr/math_macros.h"
 #include "src/__support/FPUtil/BasicOperations.h"
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class RemQuoTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class RemQuoTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
   using StorageType = typename FPBits::StorageType;
 

diff --git a/libc/test/src/math/smoke/RoundEvenTest.h b/libc/test/src/math/smoke/RoundEvenTest.h
@@ -9,13 +9,14 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_SMOKE_ROUNDEVENTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_ROUNDEVENTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
 template <typename T>
-class RoundEvenTest : public LIBC_NAMESPACE::testing::Test {
+class RoundEvenTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/RoundTest.h b/libc/test/src/math/smoke/RoundTest.h
@@ -9,12 +9,14 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_SMOKE_ROUNDTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_ROUNDTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
-template <typename T> class RoundTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class RoundTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/RoundToIntegerTest.h b/libc/test/src/math/smoke/RoundToIntegerTest.h
@@ -11,6 +11,7 @@
 
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
@@ -21,7 +22,8 @@ static constexpr int ROUNDING_MODES[4] = {FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO,
                                           FE_TONEAREST};
 
 template <typename F, typename I, bool TestModes = false>
-class RoundToIntegerTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class RoundToIntegerTestTemplate
+    : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   typedef I (*RoundToIntegerFunc)(F);
 
@@ -61,6 +63,8 @@ class RoundToIntegerTestTemplate : public LIBC_NAMESPACE::testing::Test {
 
 public:
   void SetUp() override {
+    LIBC_NAMESPACE::testing::FEnvSafeTest::SetUp();
+
     if (math_errhandling & MATH_ERREXCEPT) {
       // We will disable all exceptions so that the test will not
       // crash with SIGFPE. We can still use fetestexcept to check

diff --git a/libc/test/src/math/smoke/SqrtTest.h b/libc/test/src/math/smoke/SqrtTest.h
@@ -7,12 +7,14 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/CPP/bit.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
-template <typename T> class SqrtTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class SqrtTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/TruncTest.h b/libc/test/src/math/smoke/TruncTest.h
@@ -9,12 +9,14 @@
 #ifndef LLVM_LIBC_TEST_SRC_MATH_SMOKE_TRUNCTEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_SMOKE_TRUNCTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/math_macros.h"
 
-template <typename T> class TruncTest : public LIBC_NAMESPACE::testing::Test {
+template <typename T>
+class TruncTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/UfromfpTest.h b/libc/test/src/math/smoke/UfromfpTest.h
@@ -9,11 +9,12 @@
 #ifndef LIBC_TEST_SRC_MATH_SMOKE_UFROMFPTEST_H
 #define LIBC_TEST_SRC_MATH_SMOKE_UFROMFPTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class UfromfpTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class UfromfpTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/UfromfpxTest.h b/libc/test/src/math/smoke/UfromfpxTest.h
@@ -9,11 +9,12 @@
 #ifndef LIBC_TEST_SRC_MATH_SMOKE_UFROMFPXTEST_H
 #define LIBC_TEST_SRC_MATH_SMOKE_UFROMFPXTEST_H
 
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
 template <typename T>
-class UfromfpxTestTemplate : public LIBC_NAMESPACE::testing::Test {
+class UfromfpxTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 
   DECLARE_SPECIAL_CONSTANTS(T)
 

diff --git a/libc/test/src/math/smoke/nan_test.cpp b/libc/test/src/math/smoke/nan_test.cpp
@@ -8,11 +8,12 @@
 
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/math/nan.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include <signal.h>
 
-class LlvmLibcNanTest : public LIBC_NAMESPACE::testing::Test {
+class LlvmLibcNanTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   using StorageType = LIBC_NAMESPACE::fputil::FPBits<double>::StorageType;
 

diff --git a/libc/test/src/math/smoke/nanf128_test.cpp b/libc/test/src/math/smoke/nanf128_test.cpp
@@ -9,10 +9,11 @@
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/__support/uint128.h"
 #include "src/math/nanf128.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 
-class LlvmLibcNanf128Test : public LIBC_NAMESPACE::testing::Test {
+class LlvmLibcNanf128Test : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   using FPBits128 = LIBC_NAMESPACE::fputil::FPBits<float128>;
   using StorageType = FPBits128::StorageType;

diff --git a/libc/test/src/math/smoke/nanf_test.cpp b/libc/test/src/math/smoke/nanf_test.cpp
@@ -8,11 +8,12 @@
 
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/math/nanf.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include <signal.h>
 
-class LlvmLibcNanfTest : public LIBC_NAMESPACE::testing::Test {
+class LlvmLibcNanfTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   using StorageType = LIBC_NAMESPACE::fputil::FPBits<float>::StorageType;
 

diff --git a/libc/test/src/math/smoke/nanl_test.cpp b/libc/test/src/math/smoke/nanl_test.cpp
@@ -8,6 +8,7 @@
 
 #include "src/__support/FPUtil/FPBits.h"
 #include "src/math/nanl.h"
+#include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
 #include <signal.h>
@@ -22,7 +23,7 @@
 #error "Unknown long double type"
 #endif
 
-class LlvmLibcNanlTest : public LIBC_NAMESPACE::testing::Test {
+class LlvmLibcNanlTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
 public:
   using StorageType = LIBC_NAMESPACE::fputil::FPBits<long double>::StorageType;
 

diff --git a/utils/bazel/llvm-project-overlay/libc/test/UnitTest/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/test/UnitTest/BUILD.bazel
@@ -65,10 +65,12 @@ libc_support_library(
 libc_support_library(
     name = "fp_test_helpers",
     srcs = [
+        "FEnvSafeTest.cpp",
         "FPExceptMatcher.cpp",
         "RoundingModeUtils.cpp",
     ],
     hdrs = [
+        "FEnvSafeTest.h",
         "FPExceptMatcher.h",
         "FPMatcher.h",
         "RoundingModeUtils.h",
@@ -87,8 +89,8 @@ libc_support_library(
         "//libc:__support_fputil_fpbits_str",
         "//libc:__support_fputil_rounding_mode",
         "//libc:hdr_math_macros",
-	"//libc:hdr_fenv_macros",
-	"//libc:types_fenv_t",
+	    "//libc:hdr_fenv_macros",
+	    "//libc:types_fenv_t",
     ],
 )