mongo/jstests/multiVersion/1_test_launching_replset.js

//
// Tests launching multi-version ReplSetTest replica sets
//

// Check our latest versions
var versionsToCheck = ["last-stable", "latest"];

load('./jstests/multiVersion/libs/verify_versions.js');

jsTest.log("Testing legacy versions...");

for (var i = 0; i < versionsToCheck.length; i++) {
    var version = versionsToCheck[i];

    // Set up a replica set

    var rst = new ReplSetTest({nodes: 2});

    rst.startSet({binVersion: version});

    var nodes = rst.nodes;

    // Make sure the started versions are actually the correct versions
    for (var j = 0; j < nodes.length; j++)
        assert.binVersion(nodes[j], version);

    rst.stopSet();
}

jsTest.log("Testing mixed versions...");

// Set up a multi-version replica set

var rst = new ReplSetTest({nodes: 2});

rst.startSet({binVersion: versionsToCheck});

var nodes = rst.nodes;

// Make sure we have hosts of all the different versions
var versionsFound = [];
for (var j = 0; j < nodes.length; j++)
    versionsFound.push(nodes[j].getBinVersion());

assert.allBinVersions(versionsToCheck, versionsFound);

rst.stopSet();

jsTest.log("Done!");

//
// End
//