Error in phpunit laravel 5.4

i'm having error in phpunit in laravel 5.4 you must use php7 ،but when used php7 can't use old versions like this

$this->visit('/')
             ->see('Laravel 5');

when use phpunit

Error: Call to undefined method Tests\Feature\UserTest::visit()

/Users/mahmoud310/ecare/tests/Feature/UserTest.php:21

I read in other problems Laravel 5.4 HTTP testing - method seeInElement

use command laravel/browser-kit-testing can solve problem

in my case not work

Using version ^1.0 for laravel/browser-kit-testing
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - The requested package phpunit/phpunit (locked at 5.7.19, required as 4.8.*) is satisfiable by phpunit/phpunit[5.7.19] but these conflict with your requirements or minimum-stability.
  Problem 2
    - Conclusion: don't install phpunit/phpunit 4.8.35
    - Conclusion: don't install phpunit/phpunit 4.8.34
    - Conclusion: don't install phpunit/phpunit 4.8.33
    - Conclusion: don't install phpunit/phpunit 4.8.32
    - Conclusion: don't install phpunit/phpunit 4.8.31
    - Conclusion: don't install phpunit/phpunit 4.8.30
    - Conclusion: don't install phpunit/phpunit 4.8.29
    - Conclusion: don't install phpunit/phpunit 4.8.28
    - Conclusion: don't install phpunit/phpunit 4.8.27
    - Conclusion: don't install phpunit/phpunit 4.8.26
    - Conclusion: don't install phpunit/phpunit 4.8.25
    - Conclusion: don't install phpunit/phpunit 4.8.24
    - Conclusion: don't install phpunit/phpunit 4.8.23
    - Conclusion: don't install phpunit/phpunit 4.8.22
    - Conclusion: don't install phpunit/phpunit 4.8.21
    - Conclusion: don't install phpunit/phpunit 4.8.20
    - Conclusion: don't install phpunit/phpunit 4.8.19
    - Conclusion: don't install phpunit/phpunit 4.8.18
    - Conclusion: don't install phpunit/phpunit 4.8.17
    - Conclusion: don't install phpunit/phpunit 4.8.16
    - Conclusion: don't install phpunit/phpunit 4.8.15
    - Conclusion: don't install phpunit/phpunit 4.8.14
    - Conclusion: don't install phpunit/phpunit 4.8.13
    - Conclusion: don't install phpunit/phpunit 4.8.12
    - Conclusion: don't install phpunit/phpunit 4.8.11
    - Conclusion: don't install phpunit/phpunit 4.8.10
    - Conclusion: don't install phpunit/phpunit 4.8.9
    - Conclusion: don't install phpunit/phpunit 4.8.8
    - Conclusion: don't install phpunit/phpunit 4.8.7
    - Conclusion: don't install phpunit/phpunit 4.8.6
    - Conclusion: don't install phpunit/phpunit 4.8.5
    - Conclusion: don't install phpunit/phpunit 4.8.4
    - Conclusion: don't install phpunit/phpunit 4.8.3
    - Conclusion: don't install phpunit/phpunit 4.8.2
    - Conclusion: don't install phpunit/phpunit 4.8.1
    - phpunit/phpunit 4.8.0 conflicts with phpunit/phpunit-mock-objects[3.4.3].
    - phpunit/phpunit 4.8.0 conflicts with phpunit/phpunit-mock-objects[3.4.3].
    - phpunit/phpunit 4.8.0 conflicts with phpunit/phpunit-mock-objects[3.4.3].
    - Installation request for phpunit/phpunit 4.8.* -> satisfiable by phpunit/phpunit[4.8.0, 4.8.1, 4.8.10, 4.8.11, 4.8.12, 4.8.13, 4.8.14, 4.8.15, 4.8.16, 4.8.17, 4.8.18, 4.8.19, 4.8.2, 4.8.20, 4.8.21, 4.8.22, 4.8.23, 4.8.24, 4.8.25, 4.8.26, 4.8.27, 4.8.28, 4.8.29, 4.8.3, 4.8.30, 4.8.31, 4.8.32, 4.8.33, 4.8.34, 4.8.35, 4.8.4, 4.8.5, 4.8.6, 4.8.7, 4.8.8, 4.8.9].
    - Installation request for phpunit/phpunit-mock-objects (locked at 3.4.3) -> satisfiable by phpunit/phpunit-mock-objects[3.4.3].


Installation failed, reverting ./composer.json to its original content.

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