test(php): add phpunit tests for OauthService

[saw-jan]

Description

Add phpunit tests for OauthService class

Related Issue or Workpackage

• Resolves: https://community.openproject.org/wp/NEX-106

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Updated CHANGELOG.md file

[github-actions]

PHP Code Coverage

Coverage after merging test/phpunit-oauth-service into master will be

69.23%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
integration_openproject/server/apps/integration_openproject/lib
Capabilities.php	0%	100%	0%	0%	24, 31–40
OIDCClientMapper.php	0%	100%	0%	0%	29, 40–49, 52
ServerVersion.php	0%	100%	0%	0%	17, 27–29, 32, 41–42
TokenEventFactory.php	100%	100%	100%	100%
integration_openproject/server/apps/integration_openproject/lib/AppInfo
Application.php	37.04%	100%	50%	36%	116–118, 121–135, 138, 140, 142–143, 146, 151–152, 156–159, 161–172, 174, 177, 181, 185–187, 220
integration_openproject/server/apps/integration_openproject/lib/BackgroundJob
RemoveExpiredDirectUploadTokens.php	0%	100%	0%	0%	28, 30–32, 41–42
integration_openproject/server/apps/integration_openproject/lib/Controller
ConfigController.php	79.16%	100%	70.59%	79.51%	114, 151–152, 154, 156–158, 160–163, 166–167, 169, 194, 198–200, 442–444, 446–448, 497, 577–581, 592, 606–609, 617, 621–624, 663, 669–684, 725, 728, 731–746, 760–763, 765–769
DirectDownloadController.php	0%	100%	0%	0%	33–35, 50–52, 54–61
DirectUploadController.php	71.03%	100%	100%	70.21%	117–119, 162–164, 175, 179–182, 184, 194, 201, 217–219, 221–222, 225–230, 233, 235, 245–247, 253–255, 263–265, 280–282, 301, 306, 312
FilesController.php	85.60%	100%	83.33%	85.71%	181–182, 244, 253, 270–273, 278–280, 285–287, 299, 301, 304
OpenProjectAPIController.php	81.09%	100%	82.35%	80.98%	116, 155, 202–204, 207–214, 216–220, 222, 241, 266, 331, 381, 401, 448, 473–475, 478–482, 484, 66
OpenProjectController.php	96.45%	100%	80%	96.95%	241–245
integration_openproject/server/apps/integration_openproject/lib/Dashboard
OpenProjectWidget.php	0%	100%	0%	0%	101, 108–109, 111–116, 118–122, 124–126, 129–140, 61–66, 73, 80, 87, 94
integration_openproject/server/apps/integration_openproject/lib/Exception
OpenprojectAvatarErrorException.php	100%	100%	100%	100%
OpenprojectErrorException.php	100%	100%	100%	100%
OpenprojectFileNotUploadedException.php	100%	100%	100%	100%
OpenprojectGroupfolderSetupConflictException.php	100%	100%	100%	100%
OpenprojectResponseException.php	100%	100%	100%	100%
OpenprojectUnauthorizedUserException.php	0%	100%	0%	0%	21
integration_openproject/server/apps/integration_openproject/lib/Listener
BeforeGroupDeletedListener.php	100%	100%	100%	100%
BeforeNodeInsideOpenProjectGroupfilderChangedListener.php	0%	100%	0%	0%	46–48, 52–55, 57, 59, 62–63, 65, 67–70, 72–75, 77–79
BeforeUserDeletedListener.php	40%	100%	50%	37.50%	30, 38, 42–43, 45
LoadAdditionalScriptsListener.php	0%	100%	0%	0%	37–38, 46–47, 49, 51–52, 54
LoadSidebarScript.php	65.91%	100%	100%	64.29%	105, 77–88, 95, 98
OpenProjectReferenceListener.php	0%	100%	0%	0%	45–47, 54–55, 57, 59–60, 62–74
TermsOfServiceEventListener.php	0%	100%	0%	0%	41–42, 47–48, 50–51, 53–55, 58–62
UserChangedListener.php	0%	100%	0%	0%	34, 41–42, 45–50, 53
UserLoggedInEventListener.php	0%	100%	0%	0%	27, 35–36, 39, 42
integration_openproject/server/apps/integration_openproject/lib/Migration
Version2001Date20221213083550.php	0%	100%	0%	0%	30, 40–48, 50–58, 60–62, 64
Version20100Date20250820101358.php	0%	100%	0%	0%	38, 47–53, 56
Version2310Date20230116153411.php	0%	100%	0%	0%	29, 32–35, 37–62, 64–65, 67
Version2400Date20230504144300.php	0%	100%	0%	0%	30, 40–43
Version2640Date20240628114301.php	0%	100%	0%	0%	35, 47–49, 52–53, 56
Version2900Date20250718065820.php	0%	100%	0%	0%	22, 33–36, 38–39, 41–42, 45
integration_openproject/server/apps/integration_openproject/lib/Reference
WorkPackageReferenceProvider.php	51.67%	100%	25%	58.33%	100–101, 104, 108, 142, 150–151, 159, 37, 44, 51, 58–60, 87, 93–96, 99
integration_openproject/server/apps/integration_openproject/lib/Search
OpenProjectSearchProvider.php	0%	100%	0%	0%	100–102, 104–106, 109–110, 112–113, 116–125, 127–131, 52–55, 62, 69, 77, 79, 82, 89–90, 93–97, 99
OpenProjectSearchResultEntry.php	100%	100%	100%	100%
integration_openproject/server/apps/integration_openproject/lib/Service
DatabaseService.php	42.31%	100%	60%	40.43%	108–112, 114, 63–76, 78–85
DirectDownloadService.php	88.46%	100%	100%	87.50%	62–63, 65
DirectUploadService.php	42.86%	100%	66.67%	40%	101, 62–65, 67–75, 95
OauthService.php	100%	100%	100%	100%
OpenProjectAPIService.php	76.52%	100%	78.87%	76.33%	1005–1006, 1008,