added a test helper to test each type for having the expected default operations. (#4627)

* add test helper

* constructible from Args

* restucture ClassTraits to ensure portability of static constexpr

* fix Etags tests and format

* clang format

sdk/core/azure-core/test/ut/CMakeLists.txt

@@ -42,6 +42,7 @@ endif()
 
 add_executable (
   azure-core-test
+    test_traits.hpp
     authorization_challenge_parser_test.cpp
     azure_core_test.cpp
     base64_test.cpp

sdk/core/azure-core/test/ut/etag_test.cpp

@@ -1,6 +1,6 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // SPDX-License-Identifier: MIT
-
+#include "test_traits.hpp"
 #include <gtest/gtest.h>
 
 #include <azure/core/etag.hpp>
@@ -259,6 +259,54 @@ TEST(ETag, EqualsWeak)
   EXPECT_FALSE(ETag::Equals(weakTagtwo, weakTagTwo, ETag::ETagComparison::Weak));
 }
 
+TEST(Etag, Assignable)
+{
+  EXPECT_TRUE(ClassTraits<ETag>::is_assignable<ETag>());
+  EXPECT_TRUE(ClassTraits<ETag>::is_assignable<const ETag>());
+  EXPECT_FALSE(ClassTraits<ETag>::is_trivially_assignable<ETag>());
+  EXPECT_FALSE(ClassTraits<ETag>::is_trivially_assignable<const ETag>());
+  EXPECT_TRUE(ClassTraits<ETag>::is_nothrow_assignable<ETag>());
+  EXPECT_FALSE(ClassTraits<ETag>::is_nothrow_assignable<const ETag>());
+}
+
+TEST(Etag, Constructible)
+{
+  EXPECT_TRUE((ClassTraits<ETag, const std::string&>::is_constructible()));
+  EXPECT_FALSE((ClassTraits<ETag, const std::string&>::is_trivially_constructible()));
+  EXPECT_FALSE((ClassTraits<ETag, const std::string&>::is_nothrow_constructible()));
+  EXPECT_TRUE(ClassTraits<ETag>::is_default_constructible());
+  EXPECT_FALSE(ClassTraits<ETag>::is_trivially_default_constructible());
+  EXPECT_FALSE(ClassTraits<ETag>::is_nothrow_default_constructible());
+}
+
+TEST(Etag, CopyAndMoveConstructible)
+{
+  EXPECT_TRUE(ClassTraits<ETag>::is_copy_constructible());
+  EXPECT_FALSE(ClassTraits<ETag>::is_trivially_copy_constructible());
+  EXPECT_FALSE(ClassTraits<ETag>::is_nothrow_copy_constructible());
+  EXPECT_TRUE(ClassTraits<ETag>::is_move_constructible());
+  EXPECT_FALSE(ClassTraits<ETag>::is_trivially_move_constructible());
+  EXPECT_TRUE(ClassTraits<ETag>::is_nothrow_move_constructible());
+}
+
+TEST(Etag, CopyAndMoveAssignable)
+{
+  EXPECT_TRUE(ClassTraits<ETag>::is_copy_assignable());
+  EXPECT_FALSE(ClassTraits<ETag>::is_trivially_copy_assignable());
+  EXPECT_FALSE(ClassTraits<ETag>::is_nothrow_copy_assignable());
+  EXPECT_TRUE(ClassTraits<ETag>::is_move_assignable());
+  EXPECT_FALSE(ClassTraits<ETag>::is_trivially_move_assignable());
+  EXPECT_TRUE(ClassTraits<ETag>::is_nothrow_move_assignable());
+}
+
+TEST(Etag, Destructible)
+{
+  EXPECT_TRUE(ClassTraits<ETag>::is_destructible());
+  EXPECT_FALSE(ClassTraits<ETag>::is_trivially_destructible());
+  EXPECT_TRUE(ClassTraits<ETag>::is_nothrow_destructible());
+  EXPECT_FALSE(ClassTraits<ETag>::has_virtual_destructor());
+}
+
 #if GTEST_HAS_DEATH_TEST
 TEST(ETag, PreCondition)
 {

sdk/core/azure-core/test/ut/test_traits.hpp

@@ -0,0 +1,132 @@
+#include <type_traits>
+
+template <typename T, typename... Args> struct ClassTraits
+{
+  static_assert(std::is_class<T>::value, "ClassTraits can only be used with class types");
+
+  // Check if T is constructible from Args
+  static constexpr bool is_constructible() { return std::is_constructible<T, Args...>::value; }
+
+  // Check if T is trivially constructible from Args
+  static constexpr bool is_trivially_constructible()
+  {
+    return std::is_trivially_constructible<T, Args...>::value;
+  }
+
+  // Check if T is nothrow constructible from Args
+  static constexpr bool is_nothrow_constructible()
+  {
+    return std::is_nothrow_constructible<T, Args...>::value;
+  }
+
+  // Check if T has a default constructor
+  static constexpr bool is_default_constructible()
+  {
+    return std::is_default_constructible<T>::value;
+  }
+
+  // Check if T has a trivially default constructor
+  static constexpr bool is_trivially_default_constructible()
+  {
+    return std::is_trivially_default_constructible<T>::value;
+  }
+
+  // Check if T has a nothrow default constructor
+  static constexpr bool is_nothrow_default_constructible()
+  {
+    return std::is_nothrow_default_constructible<T>::value;
+  }
+
+  // Check if T is copy-constructible
+  static constexpr bool is_copy_constructible() { return std::is_copy_constructible<T>::value; }
+
+  // Check if T is trivially copy-constructible
+  static constexpr bool is_trivially_copy_constructible()
+  {
+    return std::is_trivially_copy_constructible<T>::value;
+  }
+
+  // Check if T is nothrow copy-constructible
+  static constexpr bool is_nothrow_copy_constructible()
+  {
+    return std::is_nothrow_copy_constructible<T>::value;
+  }
+
+  // Check if T is move-constructible
+  static constexpr bool is_move_constructible() { return std::is_move_constructible<T>::value; }
+
+  // Check if T is trivially move-constructible
+  static constexpr bool is_trivially_move_constructible()
+  {
+    return std::is_trivially_move_constructible<T>::value;
+  }
+
+  // Check if T is nothrow move-constructible
+  static constexpr bool is_nothrow_move_constructible()
+  {
+    return std::is_nothrow_move_constructible<T>::value;
+  }
+
+  // Check if T is assignable from U
+  template <typename U> static constexpr bool is_assignable()
+  {
+    return std::is_assignable<T&, U>::value;
+  }
+
+  // Check if T is trivially assignable from U
+  template <typename U> static constexpr bool is_trivially_assignable()
+  {
+    return std::is_trivially_assignable<T&, U>::value;
+  }
+
+  // Check if T is nothrow assignable from U
+  template <typename U> static constexpr bool is_nothrow_assignable()
+  {
+    return std::is_nothrow_assignable<T&, U>::value;
+  }
+
+  // Check if T is copy-assignable
+  static constexpr bool is_copy_assignable() { return std::is_copy_assignable<T>::value; }
+
+  // Check if T is trivially copy-assignable
+  static constexpr bool is_trivially_copy_assignable()
+  {
+    return std::is_trivially_copy_assignable<T>::value;
+  }
+
+  // Check if T is nothrow copy-assignable
+  static constexpr bool is_nothrow_copy_assignable()
+  {
+    return std::is_nothrow_copy_assignable<T>::value;
+  }
+
+  // Check if T is move-assignable
+  static constexpr bool is_move_assignable() { return std::is_move_assignable<T>::value; }
+
+  // Check if T is trivially move-assignable
+  static constexpr bool is_trivially_move_assignable()
+  {
+    return std::is_trivially_move_assignable<T>::value;
+  }
+
+  // Check if T is nothrow move-assignable
+  static constexpr bool is_nothrow_move_assignable()
+  {
+    return std::is_nothrow_move_assignable<T>::value;
+  }
+
+  // Check if T is destructible
+  static constexpr bool is_destructible() { return std::is_destructible<T>::value; }
+
+  // Check if T is trivially destructible
+  static constexpr bool is_trivially_destructible()
+  {
+    return std::is_trivially_destructible<T>::value;
+  }
+
+  // Check if T is nothrow destructible
+  static constexpr bool is_nothrow_destructible() { return std::is_nothrow_destructible<T>::value; }
+
+  // Check if T has virtual destructor
+  static constexpr bool has_virtual_destructor() { return std::has_virtual_destructor<T>::value; }
+};