Mocking Laravel

// 1
$mock = \Mockery::mock(Newsletter::class);
$mock->shouldReceive('someMethod')->with('key', $value)->once();
app()->instance(Newsletter::class, $mock);

// 2
$this->instance(Newsletter::class, \Mockery::mock(Newsletter::class, function($mock) {
  $mock->shouldReceive('someMethd')->with('key', 'value')->once();
}));

// 5.8
$this->mock(Newsletter::class, function($mock) {
  $mock->shouldReceive('someMethd')->with('key', 'value')->once();
});