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diff --git a/utils/cmdline/ui_mock.cpp b/utils/cmdline/ui_mock.cpp
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+// Copyright 2010 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "utils/cmdline/ui_mock.hpp"
+
+#include <iostream>
+
+#include "utils/optional.ipp"
+
+using utils::cmdline::ui_mock;
+using utils::none;
+using utils::optional;
+
+
+/// Constructs a new mock UI.
+///
+/// \param screen_width_ The width of the screen to use for testing purposes.
+///     Defaults to 0 to prevent uncontrolled wrapping on our tests.
+ui_mock::ui_mock(const std::size_t screen_width_) :
+    _screen_width(screen_width_)
+{
+}
+
+
+/// Writes a line to stderr and records it for further inspection.
+///
+/// \param message The line to print and record, without the trailing newline
+///     character.
+/// \param newline Whether to append a newline to the message or not.
+void
+ui_mock::err(const std::string& message, const bool newline)
+{
+    if (newline)
+        std::cerr << message << "\n";
+    else {
+        std::cerr << message << "\n";
+        std::cerr.flush();
+    }
+    _err_log.push_back(message);
+}
+
+
+/// Writes a line to stdout and records it for further inspection.
+///
+/// \param message The line to print and record, without the trailing newline
+///     character.
+/// \param newline Whether to append a newline to the message or not.
+void
+ui_mock::out(const std::string& message, const bool newline)
+{
+    if (newline)
+        std::cout << message << "\n";
+    else {
+        std::cout << message << "\n";
+        std::cout.flush();
+    }
+    _out_log.push_back(message);
+}
+
+
+/// Queries the width of the screen.
+///
+/// \return Always none, as we do not want to depend on line wrapping in our
+/// tests.
+optional< std::size_t >
+ui_mock::screen_width(void) const
+{
+    return _screen_width > 0 ? optional< std::size_t >(_screen_width) : none;
+}
+
+
+/// Gets all the lines written to stderr.
+///
+/// \return The printed lines.
+const std::vector< std::string >&
+ui_mock::err_log(void) const
+{
+    return _err_log;
+}
+
+
+/// Gets all the lines written to stdout.
+///
+/// \return The printed lines.
+const std::vector< std::string >&
+ui_mock::out_log(void) const
+{
+    return _out_log;
+}