/**
*    Copyright (C) 2012 MongoDB, Inc.
*
*    This program is free software: you can redistribute it and/or  modify
*    it under the terms of the GNU Affero General Public License, version 3,
*    as published by the Free Software Foundation.
*
*    This program is distributed in the hope that it will be useful,
*    but WITHOUT ANY WARRANTY; without even the implied warranty of
*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*    GNU Affero General Public License for more details.
*
*    You should have received a copy of the GNU Affero General Public License
*    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
*    As a special exception, the copyright holders give permission to link the
*    code of portions of this program with the OpenSSL library under certain
*    conditions as described in each individual source file and distribute
*    linked combinations including the program with the OpenSSL library. You
*    must comply with the GNU Affero General Public License in all respects
*    for all of the code used other than as permitted herein. If you modify
*    file(s) with this exception, you may extend this exception to your
*    version of the file(s), but you are not obligated to do so. If you do not
*    wish to do so, delete this exception statement from your version. If you
*    delete this exception statement from all source files in the program,
*    then also delete it in the license file.
*/

/**
 * Unit tests of the unittest framework itself.
 */

#include "mongo/platform/basic.h"

#include "mongo/unittest/unittest.h"

#include <limits>
#include <string>

#include "mongo/stdx/functional.h"

namespace {
    namespace stdx = mongo::stdx;

    bool containsPattern(const std::string& pattern, const std::string& value) {
        return value.find(pattern) != std::string::npos;
    }

#define ASSERT_TEST_FAILS(TEST_STMT)                                    \
    ASSERT_THROWS(TEST_STMT, mongo::unittest::TestAssertionFailureException)

#define ASSERT_TEST_FAILS_MATCH(TEST_STMT, PATTERN)                     \
    ASSERT_THROWS_PRED(                                                 \
            TEST_STMT,                                                  \
            mongo::unittest::TestAssertionFailureException,             \
            stdx::bind(containsPattern,                                 \
                       PATTERN,                                         \
                       stdx::bind(&mongo::unittest::TestAssertionFailureException::getMessage, \
                                  stdx::placeholders::_1)))

    TEST(UnitTestSelfTest, DoNothing) {
    }

    void throwSomething() { throw std::exception(); }

    TEST(UnitTestSelfTest, TestAssertThrowsSuccess) {
        ASSERT_THROWS(throwSomething(), ::std::exception);
    }

    class MyException {
    public:
        std::string what() const { return "whatever"; }
    };

    TEST(UnitTestSelfTest, TestAssertThrowsWhatSuccess) {
        ASSERT_THROWS_WHAT(throw MyException(), MyException, "whatever");
    }

    TEST(UnitTestSelfTest, TestSuccessfulNumericComparisons) {
        ASSERT_EQUALS(1LL, 1.0);
        ASSERT_NOT_EQUALS(1LL, 0.5);
        ASSERT_LESS_THAN(1, 5);
        ASSERT_LESS_THAN_OR_EQUALS(1, 5);
        ASSERT_LESS_THAN_OR_EQUALS(5, 5);
        ASSERT_GREATER_THAN(5, 1);
        ASSERT_GREATER_THAN_OR_EQUALS(5, 1);
        ASSERT_GREATER_THAN_OR_EQUALS(5, 5);
        ASSERT_APPROX_EQUAL(5, 6, 1);
    }

    TEST(UnitTestSelfTest, TestNumericComparisonFailures) {
        ASSERT_TEST_FAILS(ASSERT_EQUALS(10, 1LL));
        ASSERT_TEST_FAILS(ASSERT_NOT_EQUALS(10, 10LL));
        ASSERT_TEST_FAILS(ASSERT_LESS_THAN(10, 10LL));
        ASSERT_TEST_FAILS(ASSERT_GREATER_THAN(10, 10LL));
        ASSERT_TEST_FAILS(ASSERT_NOT_LESS_THAN(9, 10LL));
        ASSERT_TEST_FAILS(ASSERT_NOT_GREATER_THAN(1, 0LL));
        ASSERT_TEST_FAILS(ASSERT_APPROX_EQUAL(5.0, 6.1, 1));
        if (std::numeric_limits<double>::has_quiet_NaN) {
            ASSERT_TEST_FAILS(ASSERT_APPROX_EQUAL(5, std::numeric_limits<double>::quiet_NaN(), 1));
        }
        if (std::numeric_limits<double>::has_infinity) {
            ASSERT_TEST_FAILS(ASSERT_APPROX_EQUAL(5, std::numeric_limits<double>::infinity(), 1));
        }
    }

    TEST(UnitTestSelfTest, TestStringComparisons) {
        ASSERT_EQUALS(std::string("hello"), "hello");
        ASSERT_EQUALS("hello", std::string("hello"));

        ASSERT_NOT_EQUALS(std::string("hello"), "good bye!");
        ASSERT_NOT_EQUALS("hello", std::string("good bye!"));

        ASSERT_TEST_FAILS(ASSERT_NOT_EQUALS(std::string("hello"), "hello"));
        ASSERT_TEST_FAILS(ASSERT_NOT_EQUALS("hello", std::string("hello")));

        ASSERT_TEST_FAILS(ASSERT_EQUALS(std::string("hello"), "good bye!"));
        ASSERT_TEST_FAILS(ASSERT_EQUALS("hello", std::string("good bye!")));
    }

    TEST(UnitTestSelfTest, TestStreamingIntoFailures) {
        ASSERT_TEST_FAILS_MATCH(ASSERT_TRUE(false) << "Told you so", "Told you so");
        ASSERT_TEST_FAILS_MATCH(ASSERT(false) << "Told you so", "Told you so");
        ASSERT_TEST_FAILS_MATCH(ASSERT_FALSE(true) << "Told you so", "Told you so");
        ASSERT_TEST_FAILS_MATCH(ASSERT_EQUALS(1, 2) << "Told you so", "Told you so");
        ASSERT_TEST_FAILS_MATCH(FAIL("Foo") << "Told you so", "Told you so");
    }

    TEST(UnitTestSelfTest, TestNoDoubleEvaluation) {
        int i = 0;
        ASSERT_TEST_FAILS_MATCH(ASSERT_EQ(0, ++i), "(0 == 1)");
    }

}  // namespace