(function() {
    'use strict';

    /**
     * Performs basic checks on the configureFailPoint command. Also check
     * mongo/util/fail_point_test.cpp for unit tests.
     *
     * @param adminDB {DB} the admin database database object
     */
    function runTest(adminDB) {
        function expectFailPointState(fpState, expectedMode, expectedData) {
            assert.eq(expectedMode, fpState.mode);

            // Check that all expected data is present.
            for (var field in expectedData) {  // Valid only for 1 level field checks
                assert.eq(expectedData[field], fpState.data[field]);
            }

            // Check that all present data is expected.
            for (field in fpState.data) {
                assert.eq(expectedData[field], fpState.data[field]);
            }
        }

        var res;

        // A failpoint's state can be read through getParameter by prefixing its name with
        // "failpoint"

        // Test non-existing fail point
        assert.commandFailed(
            adminDB.runCommand({configureFailPoint: 'fpNotExist', mode: 'alwaysOn', data: {x: 1}}));

        // Test bad mode string
        assert.commandFailed(
            adminDB.runCommand({configureFailPoint: 'dummy', mode: 'badMode', data: {x: 1}}));
        res = adminDB.runCommand({getParameter: 1, "failpoint.dummy": 1});
        assert.commandWorked(res);
        expectFailPointState(res["failpoint.dummy"], 0, {});

        // Test bad mode obj
        assert.commandFailed(
            adminDB.runCommand({configureFailPoint: 'dummy', mode: {foo: 3}, data: {x: 1}}));
        res = adminDB.runCommand({getParameter: 1, "failpoint.dummy": 1});
        assert.commandWorked(res);
        expectFailPointState(res["failpoint.dummy"], 0, {});

        // Test bad mode type
        assert.commandFailed(
            adminDB.runCommand({configureFailPoint: 'dummy', mode: true, data: {x: 1}}));
        res = adminDB.runCommand({getParameter: 1, "failpoint.dummy": 1});
        assert.commandWorked(res);
        expectFailPointState(res["failpoint.dummy"], 0, {});

        // Test bad data type
        assert.commandFailed(
            adminDB.runCommand({configureFailPoint: 'dummy', mode: 'alwaysOn', data: 'data'}));
        res = adminDB.runCommand({getParameter: 1, "failpoint.dummy": 1});
        assert.commandWorked(res);
        expectFailPointState(res["failpoint.dummy"], 0, {});

        // Test setting mode to off.
        assert.commandWorked(adminDB.runCommand({configureFailPoint: 'dummy', mode: 'off'}));
        res = adminDB.runCommand({getParameter: 1, "failpoint.dummy": 1});
        assert.commandWorked(res);
        expectFailPointState(res["failpoint.dummy"], 0, {});

        // Test setting mode to skip.
        assert.commandWorked(adminDB.runCommand({configureFailPoint: 'dummy', mode: {skip: 2}}));
        res = adminDB.runCommand({getParameter: 1, "failpoint.dummy": 1});
        assert.commandWorked(res);
        expectFailPointState(res["failpoint.dummy"], 4, {});

        // Test good command w/ data
        assert.commandWorked(
            adminDB.runCommand({configureFailPoint: 'dummy', mode: 'alwaysOn', data: {x: 1}}));
        res = adminDB.runCommand({getParameter: 1, "failpoint.dummy": 1});
        assert.commandWorked(res);
        expectFailPointState(res["failpoint.dummy"], 1, {x: 1});
    }

    var conn = MongoRunner.runMongod();
    runTest(conn.getDB('admin'));
    MongoRunner.stopMongod(conn);

    ///////////////////////////////////////////////////////////
    // Test mongos
    var st = new ShardingTest({shards: 1});
    runTest(st.s.getDB('admin'));
    st.stop();
})();