Comparison of multiple assert per test versus single assert per test

Multiple assert per test

[Test]
public function initialiseSetsUpModelStateAndMap():void
{
    var model:Model = new Model();
    var state:State = new State();
    var map:Dictionary = new Dictionary();

    initialise(model, state, map);

    assertThat(_model, strictlyEqualTo(model));
    assertThat(_state, strictlyEqualTo(state));
    assertThat(_pageMap, strictlyEqualTo(map));
}

Single assert per test

private var model:Model;
private var state:State;
private var map:Dictionary;

private function helper():void
{
    var model:Model = new Model();
    var state:State = new State();
    var map:Dictionary = new Dictionary();

    initialise(model, state, map);
}

public function initialiseSetsUpModel():void
{
    helper();
    assertThat(_model, strictlyEqualTo(model));
}

public function initialiseSetsUpState():void
{
    helper();
    assertThat(_state, strictlyEqualTo(state));
}

public function initialiseSetsUpMap():void
{
    helper();
    assertThat(_pageMap, strictlyEqualTo(map));
}