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diff --git a/libbuild2/test/script/builtin.hxx b/libbuild2/test/script/builtin.hxx
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+++ b/libbuild2/test/script/builtin.hxx
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+// file      : libbuild2/test/script/builtin.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUILD2_TEST_SCRIPT_BUILTIN_HXX
+#define LIBBUILD2_TEST_SCRIPT_BUILTIN_HXX
+
+#include <map>
+
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+namespace build2
+{
+  namespace test
+  {
+    namespace script
+    {
+      class scope;
+
+      // A process/thread-like object representing a running builtin.
+      //
+      // For now, instead of allocating the result storage dynamically, we
+      // expect it to be provided by the caller.
+      //
+      class builtin
+      {
+      public:
+        uint8_t
+        wait () {if (t_.joinable ()) t_.join (); return r_;}
+
+        ~builtin () {wait ();}
+
+      public:
+        builtin (uint8_t& r, thread&& t = thread ()): r_ (r), t_ (move (t)) {}
+
+        builtin (builtin&&) = default;
+
+      private:
+        uint8_t& r_;
+        thread t_;
+      };
+
+      // Start builtin command. Throw system_error on failure.
+      //
+      // Note that unlike argc/argv, our args don't include the program name.
+      //
+      using builtin_func = builtin (scope&,
+                                    uint8_t& result,
+                                    const strings& args,
+                                    auto_fd in, auto_fd out, auto_fd err);
+
+      class builtin_map: public std::map<string, builtin_func*>
+      {
+      public:
+        using base = std::map<string, builtin_func*>;
+        using base::base;
+
+        // Return NULL if not a builtin.
+        //
+        builtin_func*
+        find (const string& n) const
+        {
+          auto i (base::find (n));
+          return i != end () ? i->second : nullptr;
+        }
+      };
+
+      extern const builtin_map builtins;
+    }
+  }
+}
+
+#endif // LIBBUILD2_TEST_SCRIPT_BUILTIN_HXX