public function test hasKeyPair returns whether or not the KeyPair exists in the storage()
 {
     $dummyExists = (bool) rand(0, 1);
     $this->mockStorage->exists()->shouldBeCalled()->willReturn($dummyExists);
     $response = $this->service->hasKeyPair();
     $this->assertSame($dummyExists, $response);
 }