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diff --git a/build2/test/script/lexer.hxx b/build2/test/script/lexer.hxx
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+++ b/build2/test/script/lexer.hxx
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+// file      : build2/test/script/lexer.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef BUILD2_TEST_SCRIPT_LEXER_HXX
+#define BUILD2_TEST_SCRIPT_LEXER_HXX
+
+#include <build2/types.hxx>
+#include <build2/utility.hxx>
+
+#include <build2/lexer.hxx>
+
+#include <build2/test/script/token.hxx>
+
+namespace build2
+{
+  namespace test
+  {
+    namespace script
+    {
+      struct lexer_mode: build2::lexer_mode
+      {
+        using base_type = build2::lexer_mode;
+
+        enum
+        {
+          command_line = base_type::value_next,
+          first_token,     // Expires at the end of the token.
+          second_token,    // Expires at the end of the token.
+          variable_line,   // Expires at the end of the line.
+          command_expansion,
+          here_line_single,
+          here_line_double,
+          description_line // Expires at the end of the line.
+        };
+
+        lexer_mode () = default;
+        lexer_mode (value_type v): base_type (v) {}
+        lexer_mode (base_type v): base_type (v) {}
+      };
+
+      class lexer: public build2::lexer
+      {
+      public:
+        using base_lexer = build2::lexer;
+        using base_mode = build2::lexer_mode;
+
+        lexer (istream& is,
+               const path& name,
+               lexer_mode m,
+               const char* escapes = nullptr)
+            : base_lexer (is, name, nullptr, false)
+        {
+          mode (m, '\0', escapes);
+        }
+
+        virtual void
+        mode (base_mode,
+              char = '\0',
+              optional<const char*> = nullopt) override;
+
+        // Number of quoted (double or single) tokens since last reset.
+        //
+        size_t
+        quoted () const {return quoted_;}
+
+        void
+        reset_quoted (size_t q) {quoted_ = q;}
+
+        virtual token
+        next () override;
+
+      protected:
+        token
+        next_line ();
+
+        token
+        next_description ();
+
+        virtual token
+        word (state, bool) override;
+
+      protected:
+        size_t quoted_;
+      };
+    }
+  }
+}
+
+#endif // BUILD2_TEST_SCRIPT_LEXER_HXX