handler_ptr tests:

fix #932

Ensure handler_ptr cleans up when move-constructing
a handler throws an exception.

Signed-off-by: Damian Jarek <damian.jarek93@gmail.com>

CHANGELOG.md

@@ -1,3 +1,9 @@
+Version 150:
+
+* handler_ptr tests
+
+--------------------------------------------------------------------------------
+
 Version 149:
 
 * built-in r-value return values can't be assigned

test/beast/core/handler_ptr.cpp

@@ -24,9 +24,7 @@ public:
     struct handler
     {
         std::unique_ptr<int> ptr;
-
-        void
-        operator()(bool& b) const
+        void operator()(bool& b) const
         {
             b = true;
         }
@@ -34,8 +32,7 @@ public:
 
     struct T
     {
-        explicit
-        T(handler const&)
+        explicit T(handler const&)
         {
         }
 
@@ -44,18 +41,16 @@ public:
         }
     };
 
+    void
+    testCtorExcept()
+    {
         struct U
         {
-        explicit
-        U(handler const&)
+            explicit U(handler const&)
             {
                 throw std::exception{};
             }
         };
-
-    void
-    run() override
-    {
         handler_ptr<T, handler> p1{handler{}};
         try
         {
@@ -68,13 +63,56 @@ public:
         }
         catch(...)
         {
-            fail();
+            fail("", __FILE__, __LINE__);
         }
-        handler_ptr<T, handler> p3{handler{}};
+    }
+
+    void
+    testMoveExcept()
+    {
+        struct throwing_handler
+        {
+            throwing_handler() = default;
+            throwing_handler(throwing_handler&&)
+            {
+                throw std::bad_alloc{};
+            }
+            void operator()() const
+            {
+            }
+        };
+        struct T
+        {
+            explicit T(throwing_handler const&) noexcept {}
+        };
+        try
+        {
+            throwing_handler h;
+            handler_ptr<T, throwing_handler> p{std::move(h)};
+            fail("", __FILE__, __LINE__);
+        }
+        catch (std::bad_alloc const&)
+        {
+            pass();
+        }
+    }
+
+    void
+    testInvoke()
+    {
+        handler_ptr<T, handler> p{handler{}};
         bool b = false;
-        p3.invoke(std::ref(b));
+        p.invoke(std::ref(b));
         BEAST_EXPECT(b);
     }
+
+    void
+    run() override
+    {
+        testCtorExcept();
+        testMoveExcept();
+        testInvoke();
+    }
 };
 
 BEAST_DEFINE_TESTSUITE(beast,core,handler_ptr);