diff --git a/CHANGELOG.md b/CHANGELOG.md
index ba709f93..16c5ae14 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+Version 54:
+
+* static_buffer coverage
+
+--------------------------------------------------------------------------------
+
 Version 53:
 
 * Fix basic_parser::maybe_flatten
diff --git a/include/beast/core/detail/read_size_helper.hpp b/include/beast/core/detail/read_size_helper.hpp
index 92f9aa8d..433ba38d 100644
--- a/include/beast/core/detail/read_size_helper.hpp
+++ b/include/beast/core/detail/read_size_helper.hpp
@@ -44,9 +44,7 @@ read_size_helper(
     BOOST_ASSERT(max_size >= 1);
     auto const size = buffer.size();
     auto const limit = buffer.max_size() - size;
-    if(limit <= 0)
-        BOOST_THROW_EXCEPTION(std::length_error{
-            "dynamic buffer overflow"});
+    BOOST_ASSERT(size <= buffer.max_size());
     return std::min<std::size_t>(
         std::max<std::size_t>(512, buffer.capacity() - size),
         std::min<std::size_t>(max_size, limit));
diff --git a/include/beast/core/impl/static_buffer.ipp b/include/beast/core/impl/static_buffer.ipp
index 9f7b7265..13652ca5 100644
--- a/include/beast/core/impl/static_buffer.ipp
+++ b/include/beast/core/impl/static_buffer.ipp
@@ -76,7 +76,7 @@ prepare_impl(std::size_t n) ->
     auto const len = size();
     if(n > capacity() - len)
         BOOST_THROW_EXCEPTION(std::length_error{
-            "static_buffer overflow"});
+            "buffer overflow"});
     if(len > 0)
         std::memmove(begin_, in_, len);
     in_ = begin_;
@@ -99,6 +99,31 @@ consume_impl(std::size_t n)
     in_ += n;
 }
 
+//------------------------------------------------------------------------------
+
+template<std::size_t N>
+static_buffer_n<N>::
+static_buffer_n(static_buffer_n const& other)
+    : static_buffer(buf_, N)
+{
+    using boost::asio::buffer_copy;
+    this->commit(buffer_copy(
+        this->prepare(other.size()), other.data()));
+}
+
+template<std::size_t N>
+auto
+static_buffer_n<N>::
+operator=(static_buffer_n const& other) ->
+    static_buffer_n<N>&
+{
+    using boost::asio::buffer_copy;
+    this->consume(this->size());
+    this->commit(buffer_copy(
+        this->prepare(other.size()), other.data()));
+    return *this;
+}
+
 } // beast
 
 #endif
diff --git a/include/beast/core/static_buffer.hpp b/include/beast/core/static_buffer.hpp
index dd9f5958..1f86c336 100644
--- a/include/beast/core/static_buffer.hpp
+++ b/include/beast/core/static_buffer.hpp
@@ -10,6 +10,8 @@
 
 #include <beast/config.hpp>
 #include <boost/asio/buffer.hpp>
+#include <algorithm>
+#include <cstddef>
 #include <cstring>
 
 namespace beast {
@@ -37,6 +39,9 @@ class static_buffer
     char* last_;
     char* end_;
 
+    static_buffer(static_buffer const& other) = delete;
+    static_buffer& operator=(static_buffer const&) = delete;
+
 public:
     /// The type used to represent the input sequence as a list of buffers.
     using const_buffers_type = boost::asio::const_buffers_1;
@@ -44,12 +49,6 @@ public:
     /// The type used to represent the output sequence as a list of buffers.
     using mutable_buffers_type = boost::asio::mutable_buffers_1;
 
-    static_buffer(
-        static_buffer const& other) noexcept = delete;
-
-    static_buffer& operator=(
-        static_buffer const&) noexcept = delete;
-
     /** Constructor.
 
         This creates a dynamic buffer using the provided storage area.
@@ -185,17 +184,31 @@ class static_buffer_n : public static_buffer
     char buf_[N];
 
 public:
-    /// Copy constructor (disallowed).
-    static_buffer_n(static_buffer_n const&) = delete;
+    /// Copy constructor
+    static_buffer_n(static_buffer_n const&);
 
-    /// Copy assignment (disallowed).
-    static_buffer_n& operator=(static_buffer_n const&) = delete;
+    /// Copy assignment
+    static_buffer_n& operator=(static_buffer_n const&);
 
     /// Construct a static buffer.
     static_buffer_n()
         : static_buffer(buf_, N)
     {
     }
+
+    /// Returns the @ref static_buffer portion of this object
+    static_buffer&
+    base()
+    {
+        return *this;
+    }
+
+    /// Returns the @ref static_buffer portion of this object
+    static_buffer const&
+    base() const
+    {
+        return *this;
+    }
 };
 
 } // beast
diff --git a/test/core/async_result.cpp b/test/core/async_result.cpp
index e3b72ae5..1aca1cbe 100644
--- a/test/core/async_result.cpp
+++ b/test/core/async_result.cpp
@@ -7,3 +7,32 @@
 
 // Test that header file is self-contained.
 #include <beast/core/async_result.hpp>
+
+#include <beast/core/error.hpp>
+#include <beast/core/type_traits.hpp>
+#include <cstdlib>
+
+namespace beast {
+namespace {
+
+struct handler
+{
+    void operator()(beast::error_code, std::size_t) const;
+};
+
+static_assert(detail::is_invocable<
+    typename async_result<handler, void(error_code, std::size_t)>::completion_handler_type,
+    void(error_code, std::size_t)>::value, "");
+
+static_assert(std::is_same<void,
+    typename async_result<handler, void(error_code, std::size_t)>::return_type>::value, "");
+
+static_assert(std::is_constructible<
+    async_result<handler,
+        void(error_code, std::size_t)>,
+    typename async_result<handler,
+        void(error_code, std::size_t)
+            >::completion_handler_type&>::value, "");
+
+} // (anon-ns)
+} // beast
diff --git a/test/core/buffer_test.hpp b/test/core/buffer_test.hpp
index 11df5f0d..2aac00ed 100644
--- a/test/core/buffer_test.hpp
+++ b/test/core/buffer_test.hpp
@@ -8,16 +8,43 @@
 #ifndef BEAST_TEST_BUFFER_TEST_HPP
 #define BEAST_TEST_BUFFER_TEST_HPP
 
+#include <beast/core/string_view.hpp>
 #include <beast/core/type_traits.hpp>
 #include <beast/core/detail/read_size_helper.hpp>
 #include <beast/core/detail/type_traits.hpp>
 #include <boost/asio/buffer.hpp>
 #include <algorithm>
+#include <string>
 #include <type_traits>
 
 namespace beast {
 namespace test {
 
+template<class ConstBufferSequence>
+typename std::enable_if<
+    is_const_buffer_sequence<ConstBufferSequence>::value,
+std::string>::type
+to_string(ConstBufferSequence const& bs)
+{
+    using boost::asio::buffer_cast;
+    using boost::asio::buffer_size;
+    std::string s;
+    s.reserve(buffer_size(bs));
+    for(auto const& b : bs)
+        s.append(buffer_cast<char const*>(b),
+            buffer_size(b));
+    return s;
+}
+
+template<class DynamicBuffer>
+void
+write_buffer(DynamicBuffer& b, string_view s)
+{
+    b.commit(boost::asio::buffer_copy(
+        b.prepare(s.size()), boost::asio::buffer(
+            s.data(), s.size())));
+}
+
 template<class ConstBufferSequence>
 typename std::enable_if<
     is_const_buffer_sequence<ConstBufferSequence>::value,
@@ -101,6 +128,8 @@ namespace has_read_size_helper
     };
 }
 
+//------------------------------------------------------------------------------
+
 // Make sure read_size_helper works
 template<class DynamicBuffer>
 inline
@@ -109,6 +138,7 @@ check_read_size_helper()
 {
     static_assert(is_dynamic_buffer<DynamicBuffer>::value,
         "DynamicBuffer requirements not met ");
+
     static_assert(has_read_size_helper::trait<DynamicBuffer>::value,
         "Missing read_size_helper for dynamic buffer");
 }
diff --git a/test/core/static_buffer.cpp b/test/core/static_buffer.cpp
index 8e54f1c0..bebbfa10 100644
--- a/test/core/static_buffer.cpp
+++ b/test/core/static_buffer.cpp
@@ -9,33 +9,25 @@
 #include <beast/core/static_buffer.hpp>
 
 #include "buffer_test.hpp"
+
+#include <beast/core/ostream.hpp>
+#include <beast/core/string_view.hpp>
 #include <beast/unit_test/suite.hpp>
-#include <boost/asio/buffer.hpp>
 #include <string>
 
 namespace beast {
 
+static_assert(
+    is_dynamic_buffer<static_buffer>::value,
+    "DynamicBuffer requirements not met");
+
 class static_buffer_test : public beast::unit_test::suite
 {
 public:
-    template<class ConstBufferSequence>
-    static
-    std::string
-    to_string(ConstBufferSequence const& bs)
-    {
-        using boost::asio::buffer_cast;
-        using boost::asio::buffer_size;
-        std::string s;
-        s.reserve(buffer_size(bs));
-        for(auto const& b : bs)
-            s.append(buffer_cast<char const*>(b),
-                buffer_size(b));
-        return s;
-    }
-
     void
     testStaticBuffer()
     {
+        using namespace test;
         using boost::asio::buffer;
         using boost::asio::buffer_cast;
         using boost::asio::buffer_size;
@@ -142,15 +134,100 @@ public:
     }
 
     void
-    testReadSizeHelper()
+    testBuffer()
     {
+        using namespace test;
+        string_view const s = "Hello, world!";
+        
+        // static_buffer
+        {
+            char buf[64];
+            static_buffer b{buf, sizeof(buf)};
+            ostream(b) << s;
+            BEAST_EXPECT(to_string(b.data()) == s);
+            b.consume(b.size());
+            BEAST_EXPECT(to_string(b.data()) == "");
+        }
+
+        // static_buffer_n
+        {
+            static_buffer_n<64> b1;
+            BEAST_EXPECT(b1.size() == 0);
+            BEAST_EXPECT(b1.max_size() == 64);
+            BEAST_EXPECT(b1.capacity() == 64);
+            ostream(b1) << s;
+            BEAST_EXPECT(to_string(b1.data()) == s);
+            {
+                static_buffer_n<64> b2{b1};
+                BEAST_EXPECT(to_string(b2.data()) == s);
+                b2.consume(7);
+                BEAST_EXPECT(to_string(b2.data()) == s.substr(7));
+            }
+            {
+                static_buffer_n<64> b2;
+                b2 = b1;
+                BEAST_EXPECT(to_string(b2.data()) == s);
+                b2.consume(7);
+                BEAST_EXPECT(to_string(b2.data()) == s.substr(7));
+            }
+        }
+
+        // cause memmove
+        {
+            static_buffer_n<10> b;
+            write_buffer(b, "12345");
+            b.consume(3);
+            write_buffer(b, "67890123");
+            BEAST_EXPECT(to_string(b.data()) == "4567890123");
+            try
+            {
+                b.prepare(1);
+                fail("", __FILE__, __LINE__);
+            }
+            catch(std::length_error const&)
+            {
+                pass();
+            }
+        }
+
+        // read_size_helper
+        {
+            using detail::read_size_helper;
+            static_buffer_n<10> b;
+            BEAST_EXPECT(read_size_helper(b, 512) == 10);
+            b.prepare(4);
+            b.commit(4);
+            BEAST_EXPECT(read_size_helper(b, 512) == 6);
+            b.consume(2);
+            BEAST_EXPECT(read_size_helper(b, 512) == 8);
+            b.prepare(8);
+            b.commit(8);
+            BEAST_EXPECT(read_size_helper(b, 512) == 0);
+        }
+
+        // base
+        {
+            static_buffer_n<10> b;
+            [&](static_buffer& b)
+            {
+                BEAST_EXPECT(b.max_size() == b.capacity());
+            }
+            (b.base());
+
+            [&](static_buffer const&)
+            {
+                BEAST_EXPECT(b.max_size() == b.capacity());
+            }
+            (b.base());
+        }
     }
 
     void run() override
     {
         test::check_read_size_helper<static_buffer_n<32>>();
 
-        testStaticBuffer();
+        testBuffer();
+        //testStaticBuffer();
     }
 };