diff --git a/libc/test/src/math/smoke/CMakeLists.txt b/libc/test/src/math/smoke/CMakeLists.txt
@@ -327,6 +327,66 @@ add_fp_unittest(
     libc.src.__support.integer_literals
 )
 
+add_fp_unittest(
+  iscanonical_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    iscanonical_test.cpp
+  HDRS
+    IsCanonicalTest.h
+  DEPENDS
+    libc.src.math.iscanonical
+)
+
+add_fp_unittest(
+  iscanonicalf_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    iscanonicalf_test.cpp
+  HDRS
+    IsCanonicalTest.h
+  DEPENDS
+    libc.src.math.iscanonicalf
+)
+
+add_fp_unittest(
+  iscanonicall_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    iscanonicall_test.cpp
+  HDRS
+    IsCanonicalTest.h
+  DEPENDS
+    libc.src.math.iscanonicall
+)
+
+add_fp_unittest(
+  iscanonicalf16_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    iscanonicalf16_test.cpp
+  HDRS
+    IsCanonicalTest.h
+  DEPENDS
+    libc.src.math.iscanonicalf16
+)
+
+add_fp_unittest(
+  iscanonicalf128_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    iscanonicalf128_test.cpp
+  HDRS
+    IsCanonicalTest.h
+  DEPENDS
+    libc.src.math.iscanonicalf128
+)
+
 add_fp_unittest(
   ceil_test
   SUITE

diff --git a/libc/test/src/math/smoke/IsCanonicalTest.h b/libc/test/src/math/smoke/IsCanonicalTest.h
@@ -0,0 +1,58 @@
+//===-- Utility class to test different flavors of iscanonical --*- C++ -*-===//
+//
+// 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_MATH_SMOKE_ISCANONICALTEST_H
+#define LLVM_LIBC_TEST_SRC_MATH_SMOKE_ISCANONICALTEST_H
+
+#include "test/UnitTest/FEnvSafeTest.h"
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+
+template <typename T>
+class IsCanonicalTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
+
+  DECLARE_SPECIAL_CONSTANTS(T)
+
+public:
+  typedef int (*IsCanonicalFunc)(T);
+
+  void testSpecialNumbers(IsCanonicalFunc func) {
+    EXPECT_EQ(func(aNaN), 1);
+    EXPECT_EQ(func(neg_aNaN), 1);
+    EXPECT_EQ(func(sNaN), 0);
+    EXPECT_EQ(func(neg_sNaN), 0);
+    EXPECT_EQ(func(inf), 1);
+    EXPECT_EQ(func(neg_inf), 1);
+    EXPECT_EQ(func(min_normal), 1);
+    EXPECT_EQ(func(max_normal), 1);
+    EXPECT_EQ(func(neg_max_normal), 1);
+    EXPECT_EQ(func(min_denormal), 1);
+    EXPECT_EQ(func(neg_min_denormal), 1);
+    EXPECT_EQ(func(max_denormal), 1);
+    EXPECT_EQ(func(zero), 1);
+    EXPECT_EQ(func(neg_zero), 1);
+  }
+
+  void testRoundedNumbers(IsCanonicalFunc func) {
+    EXPECT_EQ(func(T(1.0)), 1);
+    EXPECT_EQ(func(T(-1.0)), 1);
+    EXPECT_EQ(func(T(10.0)), 1);
+    EXPECT_EQ(func(T(-10.0)), 1);
+    EXPECT_EQ(func(T(1234.0)), 1);
+    EXPECT_EQ(func(T(-1234.0)), 1);
+  }
+};
+
+#define LIST_ISCANONICAL_TESTS(T, func)                                        \
+  using LlvmLibcIsCanonicalTest = IsCanonicalTest<T>;                          \
+  TEST_F(LlvmLibcIsCanonicalTest, SpecialNumbers) {                            \
+    testSpecialNumbers(&func);                                                 \
+  }                                                                            \
+  TEST_F(LlvmLibcIsCanonicalTest, RoundedNubmers) { testRoundedNumbers(&func); }
+
+#endif // LLVM_LIBC_TEST_SRC_MATH_SMOKE_ISCANONICALTEST_H
diff --git a/libc/test/src/math/smoke/iscanonical_test.cpp b/libc/test/src/math/smoke/iscanonical_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for iscanonical -----------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "IsCanonicalTest.h"
+
+#include "src/math/iscanonical.h"
+
+LIST_ISCANONICAL_TESTS(double, LIBC_NAMESPACE::iscanonical)
diff --git a/libc/test/src/math/smoke/iscanonicalf128_test.cpp b/libc/test/src/math/smoke/iscanonicalf128_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for iscanonicalf128 -------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "IsCanonicalTest.h"
+
+#include "src/math/iscanonicalf128.h"
+
+LIST_ISCANONICAL_TESTS(float128, LIBC_NAMESPACE::iscanonicalf128)
diff --git a/libc/test/src/math/smoke/iscanonicalf16_test.cpp b/libc/test/src/math/smoke/iscanonicalf16_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for iscanonicalf16 --------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "IsCanonicalTest.h"
+
+#include "src/math/iscanonicalf16.h"
+
+LIST_ISCANONICAL_TESTS(float16, LIBC_NAMESPACE::iscanonicalf16)
diff --git a/libc/test/src/math/smoke/iscanonicalf_test.cpp b/libc/test/src/math/smoke/iscanonicalf_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for iscanonicalf ----------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "IsCanonicalTest.h"
+
+#include "src/math/iscanonicalf.h"
+
+LIST_ISCANONICAL_TESTS(float, LIBC_NAMESPACE::iscanonicalf)
diff --git a/libc/test/src/math/smoke/iscanonicall_test.cpp b/libc/test/src/math/smoke/iscanonicall_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for iscanonicall ----------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "IsCanonicalTest.h"
+
+#include "src/math/iscanonicall.h"
+
+LIST_ISCANONICAL_TESTS(long double, LIBC_NAMESPACE::iscanonicall)