How to mock a trait method using getMockForTrait()

MockTraitMethodTest.php

class MockTraitMethodTest extends \PHPUnit_Framework_TestCase
{
    public function testTraitMock()
    {
        // Inspect getMockForTrait signature for what the other arguments do.
        $methodsToMock = ['getBar'];
        $mockTrait = $this->getMockForTrait('\Example\Foo', [], '', true, true, true, $methodsToMock);
        $mockTrait->expects($this->any())
            ->method('getBar')
            ->willReturn('buz');
        $this->assertEquals('buz', $mockTrait->getBar()); 
    }
} 

Thank you!