mongodb/jstests/noPassthrough/shell_disable_majority_reads.js

// This test ensures that we respect the value of 'enableMajorityReadConcern' included in TestData.
// @tags: [requires_wiredtiger, requires_replication, requires_majority_read_concern,
// requires_persistence]
(function() {
    "use strict";

    // Majority reads are enabled by default.
    let rst = new ReplSetTest({nodes: 1});
    rst.startSet();
    rst.initiate();

    let serverStatus = rst.getPrimary().getDB("test").serverStatus();
    assert(serverStatus.storageEngine.supportsCommittedReads, tojson(serverStatus));
    rst.stopSet();

    // Explicitly enable majority reads.
    TestData.enableMajorityReadConcern = true;
    rst = new ReplSetTest({nodes: 1});
    rst.startSet();
    rst.initiate();

    serverStatus = rst.getPrimary().getDB("test").serverStatus();
    assert(serverStatus.storageEngine.supportsCommittedReads, tojson(serverStatus));
    rst.stopSet();

    // Explicitly disable majority reads.
    TestData.enableMajorityReadConcern = false;
    rst = new ReplSetTest({nodes: 1});
    rst.startSet();
    rst.initiate();

    serverStatus = rst.getPrimary().getDB("test").serverStatus();
    assert(!serverStatus.storageEngine.supportsCommittedReads, tojson(serverStatus));
    rst.stopSet();
})();