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diff --git a/engine/config_test.cpp b/engine/config_test.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 "engine/config.hpp"
+
+#if defined(HAVE_CONFIG_H)
+# include "config.h"
+#endif
+
+#include <stdexcept>
+#include <vector>
+
+#include <atf-c++.hpp>
+
+#include "engine/exceptions.hpp"
+#include "utils/cmdline/exceptions.hpp"
+#include "utils/cmdline/parser.hpp"
+#include "utils/config/tree.ipp"
+#include "utils/passwd.hpp"
+
+namespace config = utils::config;
+namespace fs = utils::fs;
+namespace passwd = utils::passwd;
+
+using utils::none;
+using utils::optional;
+
+
+namespace {
+
+
+/// Replaces the system user database with a fake one for testing purposes.
+static void
+set_mock_users(void)
+{
+ std::vector< passwd::user > users;
+ users.push_back(passwd::user("user1", 100, 150));
+ users.push_back(passwd::user("user2", 200, 250));
+ passwd::set_mock_users_for_testing(users);
+}
+
+
+/// Checks that the default values of a config object match our expectations.
+///
+/// This fails the test case if any field of the input config object is not
+/// what we expect.
+///
+/// \param config The configuration to validate.
+static void
+validate_defaults(const config::tree& config)
+{
+ ATF_REQUIRE_EQ(
+ KYUA_ARCHITECTURE,
+ config.lookup< config::string_node >("architecture"));
+
+ ATF_REQUIRE_EQ(
+ 1,
+ config.lookup< config::positive_int_node >("parallelism"));
+
+ ATF_REQUIRE_EQ(
+ KYUA_PLATFORM,
+ config.lookup< config::string_node >("platform"));
+
+ ATF_REQUIRE(!config.is_set("unprivileged_user"));
+
+ ATF_REQUIRE(config.all_properties("test_suites").empty());
+}
+
+
+} // anonymous namespace
+
+
+ATF_TEST_CASE_WITHOUT_HEAD(config__defaults);
+ATF_TEST_CASE_BODY(config__defaults)
+{
+ const config::tree user_config = engine::default_config();
+ validate_defaults(user_config);
+}
+
+
+ATF_TEST_CASE_WITHOUT_HEAD(config__set__parallelism);
+ATF_TEST_CASE_BODY(config__set__parallelism)
+{
+ config::tree user_config = engine::default_config();
+ user_config.set_string("parallelism", "8");
+ ATF_REQUIRE_THROW_RE(
+ config::error, "parallelism.*Must be a positive integer",
+ user_config.set_string("parallelism", "0"));
+ ATF_REQUIRE_THROW_RE(
+ config::error, "parallelism.*Must be a positive integer",
+ user_config.set_string("parallelism", "-1"));
+}
+
+
+ATF_TEST_CASE_WITHOUT_HEAD(config__load__defaults);
+ATF_TEST_CASE_BODY(config__load__defaults)
+{
+ atf::utils::create_file("config", "syntax(2)\n");
+
+ const config::tree user_config = engine::load_config(fs::path("config"));
+ validate_defaults(user_config);
+}
+
+
+ATF_TEST_CASE_WITHOUT_HEAD(config__load__overrides);
+ATF_TEST_CASE_BODY(config__load__overrides)
+{
+ set_mock_users();
+
+ atf::utils::create_file(
+ "config",
+ "syntax(2)\n"
+ "architecture = 'test-architecture'\n"
+ "parallelism = 16\n"
+ "platform = 'test-platform'\n"
+ "unprivileged_user = 'user2'\n"
+ "test_suites.mysuite.myvar = 'myvalue'\n");
+
+ const config::tree user_config = engine::load_config(fs::path("config"));
+
+ ATF_REQUIRE_EQ("test-architecture",
+ user_config.lookup_string("architecture"));
+ ATF_REQUIRE_EQ("16",
+ user_config.lookup_string("parallelism"));
+ ATF_REQUIRE_EQ("test-platform",
+ user_config.lookup_string("platform"));
+
+ const passwd::user& user = user_config.lookup< engine::user_node >(
+ "unprivileged_user");
+ ATF_REQUIRE_EQ("user2", user.name);
+ ATF_REQUIRE_EQ(200, user.uid);
+
+ config::properties_map exp_test_suites;
+ exp_test_suites["test_suites.mysuite.myvar"] = "myvalue";
+
+ ATF_REQUIRE(exp_test_suites == user_config.all_properties("test_suites"));
+}
+
+
+ATF_TEST_CASE_WITHOUT_HEAD(config__load__lua_error);
+ATF_TEST_CASE_BODY(config__load__lua_error)
+{
+ atf::utils::create_file("config", "this syntax is invalid\n");
+
+ ATF_REQUIRE_THROW(engine::load_error, engine::load_config(
+ fs::path("config")));
+}
+
+
+ATF_TEST_CASE_WITHOUT_HEAD(config__load__bad_syntax__version);
+ATF_TEST_CASE_BODY(config__load__bad_syntax__version)
+{
+ atf::utils::create_file("config", "syntax(123)\n");
+
+ ATF_REQUIRE_THROW_RE(engine::load_error,
+ "Unsupported config version 123",
+ engine::load_config(fs::path("config")));
+}
+
+
+ATF_TEST_CASE_WITHOUT_HEAD(config__load__missing_file);
+ATF_TEST_CASE_BODY(config__load__missing_file)
+{
+ ATF_REQUIRE_THROW_RE(engine::load_error, "Load of 'missing' failed",
+ engine::load_config(fs::path("missing")));
+}
+
+
+ATF_INIT_TEST_CASES(tcs)
+{
+ ATF_ADD_TEST_CASE(tcs, config__defaults);
+ ATF_ADD_TEST_CASE(tcs, config__set__parallelism);
+ ATF_ADD_TEST_CASE(tcs, config__load__defaults);
+ ATF_ADD_TEST_CASE(tcs, config__load__overrides);
+ ATF_ADD_TEST_CASE(tcs, config__load__lua_error);
+ ATF_ADD_TEST_CASE(tcs, config__load__bad_syntax__version);
+ ATF_ADD_TEST_CASE(tcs, config__load__missing_file);
+}