java.lang.SecurityException: class "org.hamcrest.Matchers"'s signer information does not match signer information of other classes in the same package

Estou com essa exception ao tentar utilizar o expect(). tenho o seguinte código:

@Test
    public void deveDeletarBovino() {

        String data = "20/05/2010";
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");
        LocalDate date = LocalDate.parse(data, formatter);
        Bovine bovine = new Bovine();
        bovine.setId(2571);
        bovine.setBirth(date);
        bovine.setWeight(1500.0);
        bovine.setValue(new BigDecimal(130));
        bovine.setWeightArrobaFree();
        bovine.setType(BovineType.BEZERRO);
        bovine.setSex(Sex.FEMALE);
        bovine.setAge();
        bovine.setNick("TESTES4");
        int id = bovine.getId();

        given().port(port).header("accept", "application/json").contentType("application/json").body(bovine).when()
                .post("/cattlefarm/api/listaBovinos/" + id);

        expect().statusCode(200).when().delete("/cattlefarm/api/listaBovinos/" + id);

    }

ele lança a seguinte exception:

java.lang.SecurityException: class "org.hamcrest.Matchers"'s signer information does not match signer information of other classes in the same package

Quando utilizo o assertEquals do JUnit o teste passa:

public void deveDeletarBovino() {

        String data = "20/05/2010";
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");
        LocalDate date = LocalDate.parse(data, formatter);
        Bovine bovine = new Bovine();
        bovine.setId(2571);
        bovine.setBirth(date);
        bovine.setWeight(1500.0);
        bovine.setValue(new BigDecimal(130));
        bovine.setWeightArrobaFree();
        bovine.setType(BovineType.BEZERRO);
        bovine.setSex(Sex.FEMALE);
        bovine.setAge();
        bovine.setNick("TESTES4");
        int id = bovine.getId();

        given().port(port).header("accept", "application/json").contentType("application/json").body(bovine).when()
                .post("/cattlefarm/api/listaBovinos/" + id);

        int statusCode = given().port(port).when().delete("/cattlefarm/api/listaBovinos/" + id).andReturn()
                .statusCode();

        assertEquals(200, statusCode);
    }

Me parece um conflito, com o Junit e o RestAssured. Estou Usando Spring-boot e Java 10. segue o link do projeto: https://github.com/igor-rodrigues2017/cattlefarm