Flugg\Responder\Tests\Unit\TransformerTest::setRelationsMethodAllowsASingleValue PHP Method

    public function setRelationsMethodAllowsASingleValue()
    {
        // Arrange...
        $transformer = $this->makeTransformer();
        // Act...
        $transformer->setRelations('foo');
        // Assert...
        $this->assertEquals(['foo'], $transformer->getAvailableIncludes());
    }