How to update phpunit 6 and code-coverage 5 - composer-php

Question

I am using phpunit 6.5.14 togehter with php-code-coverage 5.3.2
I would like to update phpunit and php-code-coverage. However, when i try to update one of them, it fails because they require each other.
For example. calling
composer require --dev phpunit/phpunit ^7
fails with:
1/1: http://repo.packagist.org/p/provider-latest$f1c1ff74699130b4d82cd11e43a57fffc27fdcc5f268000782f585b13d1c5d4c.json
Finished: success: 1, skipped: 0, failure: 0, total: 1
./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
- Conclusion: don't install phpunit/phpunit 7.5.17
- Conclusion: don't install phpunit/phpunit 7.5.16
- Conclusion: don't install phpunit/phpunit 7.5.15
- Conclusion: don't install phpunit/phpunit 7.5.14
- Conclusion: don't install phpunit/phpunit 7.5.13
- Conclusion: don't install phpunit/phpunit 7.5.12
- Conclusion: don't install phpunit/phpunit 7.5.11
- Conclusion: don't install phpunit/phpunit 7.5.10
- Conclusion: don't install phpunit/phpunit 7.5.9
- Conclusion: don't install phpunit/phpunit 7.5.8
- Conclusion: don't install phpunit/phpunit 7.5.7
- Conclusion: don't install phpunit/phpunit 7.5.6
- Conclusion: don't install phpunit/phpunit 7.5.5
- Conclusion: don't install phpunit/phpunit 7.5.4
- Conclusion: don't install phpunit/phpunit 7.5.3
- Conclusion: don't install phpunit/phpunit 7.5.2
- Conclusion: don't install phpunit/phpunit 7.5.1
- Conclusion: don't install phpunit/phpunit 7.5.0
- Conclusion: don't install phpunit/phpunit 7.4.5
- Conclusion: don't install phpunit/phpunit 7.4.4
- Conclusion: don't install phpunit/phpunit 7.4.3
- Conclusion: don't install phpunit/phpunit 7.4.2
- Conclusion: don't install phpunit/phpunit 7.4.1
- Conclusion: don't install phpunit/phpunit 7.4.0
- Conclusion: don't install phpunit/phpunit 7.3.5
- Conclusion: don't install phpunit/phpunit 7.3.4
- Conclusion: don't install phpunit/phpunit 7.3.3
- Conclusion: don't install phpunit/phpunit 7.3.2
- Conclusion: don't install phpunit/phpunit 7.3.1
- Conclusion: don't install phpunit/phpunit 7.3.0
- Conclusion: don't install phpunit/phpunit 7.2.7
- Conclusion: don't install phpunit/phpunit 7.2.6
- Conclusion: don't install phpunit/phpunit 7.2.5
- Conclusion: don't install phpunit/phpunit 7.2.4
- Conclusion: don't install phpunit/phpunit 7.2.3
- Conclusion: don't install phpunit/phpunit 7.2.2
- Conclusion: don't install phpunit/phpunit 7.2.1
- Conclusion: don't install phpunit/phpunit 7.2.0
- Conclusion: don't install phpunit/phpunit 7.1.5
- Conclusion: don't install phpunit/phpunit 7.1.4
- Conclusion: don't install phpunit/phpunit 7.1.3
- Conclusion: don't install phpunit/phpunit 7.1.2
- Conclusion: don't install phpunit/phpunit 7.1.1
- Conclusion: don't install phpunit/phpunit 7.1.0
- Conclusion: don't install phpunit/phpunit 7.0.3
- Conclusion: don't install phpunit/phpunit 7.0.2
- Conclusion: don't install phpunit/phpunit 7.0.1
- Conclusion: remove phpunit/php-code-coverage 5.3.2
- Installation request for phpunit/phpunit-mock-objects (locked at 5.0.10) -> satisfiable by phpunit/phpunit-mock-objects[5.0.10].
- Installation request for phpunit/phpunit ^7 -> satisfiable by phpunit/phpunit[7.0.0, 7.0.1, 7.0.2, 7.0.3, 7.1.0, 7.1.1, 7.1.2, 7.1.3, 7.1.4, 7.1.5, 7.2.0, 7.2.1, 7.2.2, 7.2.3, 7.2.4, 7.2.5, 7.2.6, 7.2.7, 7.3.0, 7.3.1, 7.3.2, 7.3.3, 7.3.4, 7.3.5, 7.4.0, 7.4.1, 7.4.2, 7.4.3, 7.4.4, 7.4.5, 7.5.0, 7.5.1, 7.5.10, 7.5.11, 7.5.12, 7.5.13, 7.5.14, 7.5.15, 7.5.16, 7.5.17, 7.5.2, 7.5.3, 7.5.4, 7.5.5, 7.5.6, 7.5.7, 7.5.8, 7.5.9].
- Conclusion: don't install phpunit/php-code-coverage 5.3.2
- phpunit/phpunit 7.0.0 requires phpunit/php-code-coverage ^6.0 -> satisfiable by phpunit/php-code-coverage[6.0.0, 6.0.1, 6.0.2, 6.0.3, 6.0.4, 6.0.5, 6.0.6, 6.0.7, 6.0.8, 6.1.0, 6.1.1, 6.1.2, 6.1.3, 6.1.4].
- Can only install one of: phpunit/php-code-coverage[6.0.0, 5.3.2].
- Can only install one of: phpunit/php-code-coverage[6.0.1, 5.3.2].
- Can only install one of: phpunit/php-code-coverage[6.0.2, 5.3.2].
- Can only install one of: phpunit/php-code-coverage[6.0.3, 5.3.2].
- Can only install one of: phpunit/php-code-coverage[6.0.4, 5.3.2].
- Can only install one of: phpunit/php-code-coverage[6.0.5, 5.3.2].
- Can only install one of: phpunit/php-code-coverage[6.0.6, 5.3.2].
- Can only install one of: phpunit/php-code-coverage[6.0.7, 5.3.2].
- Can only install one of: phpunit/php-code-coverage[6.0.8, 5.3.2].
- Can only install one of: phpunit/php-code-coverage[6.1.0, 5.3.2].
- Can only install one of: phpunit/php-code-coverage[6.1.1, 5.3.2].
- Can only install one of: phpunit/php-code-coverage[6.1.2, 5.3.2].
- Can only install one of: phpunit/php-code-coverage[6.1.3, 5.3.2].
- Can only install one of: phpunit/php-code-coverage[6.1.4, 5.3.2].
- Installation request for phpunit/php-code-coverage (locked at 5.3.2) -> satisfiable by phpunit/php-code-coverage[5.3.2].
Trying to update code-coverage by
composer require phpunit/php-code-coverage ^6
fails with:
1/3: http://repo.packagist.org/p/provider-2019-10$1fbc8abf3f09ae347d28fffd902e6857758ba1084d91f9a81432e2a4039456fa.json
2/3: http://repo.packagist.org/p/provider-latest$b45915c1d4dfb4884956884c1468dfdd815ecef36ccfcbfe487b1bde9b209131.json
3/3: http://repo.packagist.org/p/provider-2019-07$645a5eaea36f8c8ff4b02534eb6864a423517398ecd77c4709effcb55d4a0c07.json
Finished: success: 3, skipped: 0, failure: 0, total: 3
./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
- phpunit/phpunit 6.5.14 requires phpunit/php-code-coverage ^5.3 -> satisfiable by phpunit/php-code-coverage[5.3.0, 5.3.1, 5.3.2, 5.3.x-dev] but these conflict with your requirements or minimum-stability.
- phpunit/phpunit 6.5.14 requires phpunit/php-code-coverage ^5.3 -> satisfiable by phpunit/php-code-coverage[5.3.0, 5.3.1, 5.3.2, 5.3.x-dev] but these conflict with your requirements or minimum-stability.
- phpunit/phpunit 6.5.14 requires phpunit/php-code-coverage ^5.3 -> satisfiable by phpunit/php-code-coverage[5.3.0, 5.3.1, 5.3.2, 5.3.x-dev] but these conflict with your requirements or minimum-stability.
- Installation request for phpunit/phpunit (locked at 6.5.14, required as ~6.0) -> satisfiable by phpunit/phpunit[6.5.14].
Installation failed, reverting ./composer.json to its original content.
I also tried to remove the code-coverage, so that I can update php-unit and reinstall it again. But removing it with
composer remove phpunit/php-code-coverage
does not work and just gives this notification:
phpunit/php-code-coverage is not required in your composer.json and has not been removed
Loading composer repositories with package information
Updating dependencies (including require-dev)
Nothing to install or update
Package phpunit/phpunit-mock-objects is abandoned, you should avoid using it. No replacement was suggested.
Generating optimized autoload files
ocramius/package-versions: Generating version class...
ocramius/package-versions: ...done generating version class
Carbon 1 is deprecated, see how to migrate to Carbon 2.
https://carbon.nesbot.com/docs/#api-carbon-2
You can run './vendor/bin/upgrade-carbon' to get help in updating carbon and other frameworks and libraries that depend on it.
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> #php artisan package:discover
Discovered Package: arrilot/laravel-widgets
Discovered Package: barryvdh/laravel-debugbar
Discovered Package: fideloper/proxy
Discovered Package: intervention/image
Discovered Package: iwasherefirst2/laravel-multimail
Discovered Package: larapack/voyager-hooks
Discovered Package: laravel/tinker
Discovered Package: mcamara/laravel-localization
Discovered Package: nunomaduro/larastan
Discovered Package: spatie/laravel-sitemap
Discovered Package: tcg/voyager
Discovered Package: xethron/migrations-generator
Package manifest generated successfully.
How may update both packages?

Answer 1

I recommend deleting composer.lock and or vendor, as Composer is not perfect in this. Often there is no conflict at all.
Then change remove both packages from composer.json.
Then let composer re-decide the highest version possible:
composer require phpunit/phpunit
You can ommit the phpunit/php-code-coverage, as it's already in phpunit/phpunit required packages.

Answer 2

I solved it by using --update-with-dependencies:
$ composer require --dev --update-with-dependencies phpunit/phpunit ^7.0.0
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 0 installs, 12 updates, 1 removal
- Removing phpunit/phpunit-mock-objects (5.0.10)
- Updating sebastian/resource-operations (1.0.0 => 2.0.1): Downloading (100%)
- Updating sebastian/environment (3.1.0 => 4.2.3): Downloading (100%)
- Updating sebastian/diff (2.0.1 => 3.0.2): Downloading (100%)
- Updating sebastian/comparator (2.1.3 => 3.0.2): Downloading (100%)
- Updating phpunit/php-timer (1.0.9 => 2.1.2): Downloading (100%)
- Updating phpunit/php-file-iterator (1.4.5 => 2.0.2): Downloading (100%)
- Updating phpunit/php-token-stream (2.0.2 => 3.1.1): Downloading (100%)
- Updating phpunit/php-code-coverage (5.3.2 => 6.1.4): Downloading (100%)
- Updating phar-io/version (1.0.1 => 2.0.1): Downloading (100%)
- Updating phar-io/manifest (1.0.1 => 1.0.3): Downloading (100%)
- Updating phpunit/phpunit (6.5.14 => 7.5.20): Downloading (100%)
(I found that option through https://github.com/composer/composer/issues/3063)