jstests/core_standalone/write_concern.js


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// This test verifies writeConcern behavior on a standalone mongod or embedded mongoed.

(function() {
    'use strict';

    var col = db.write_concern;
    col.drop();

    // Supported writeConcern on standalone
    assert.commandWorked(col.insert({_id: 0}, {writeConcern: {w: 0}}));
    assert.commandWorked(col.insert({_id: 1}, {writeConcern: {w: 1}}));
    assert.commandWorked(col.insert({_id: "majority"}, {writeConcern: {w: "majority"}}));

    // writeConcern: 2 should not work on standalone
    assert.writeError(col.insert({_id: 2}, {writeConcern: {w: 2}}),
                      "expected writeConcern: 2 to fail");

})();