15 files declare their use of Workspace

InstallUninstallTest.php in core/modules/system/tests/src/Functional/Module/InstallUninstallTest.php
PathWorkspacesTest.php in core/modules/workspaces/tests/src/Functional/PathWorkspacesTest.php
TestWorkspaceNegotiator.php in core/modules/workspaces/tests/modules/workspace_update_test/src/Negotiator/TestWorkspaceNegotiator.php
WorkspaceAccessTest.php in core/modules/workspaces/tests/src/Kernel/WorkspaceAccessTest.php
WorkspaceCacheContextTest.php in core/modules/workspaces/tests/src/Functional/WorkspaceCacheContextTest.php
WorkspaceContentModerationIntegrationTest.php in core/modules/content_moderation/tests/src/Functional/WorkspaceContentModerationIntegrationTest.php
WorkspaceCRUDTest.php in core/modules/workspaces/tests/src/Kernel/WorkspaceCRUDTest.php
WorkspaceIntegrationTest.php in core/modules/workspaces/tests/src/Kernel/WorkspaceIntegrationTest.php
WorkspacePermissionsTest.php in core/modules/workspaces/tests/src/Functional/WorkspacePermissionsTest.php
WorkspaceResourceTestBase.php in core/modules/workspaces/tests/src/Functional/EntityResource/WorkspaceResourceTestBase.php
workspaces.install in core/modules/workspaces/workspaces.install
Contains install, update and uninstall functions for the Workspaces module.
WorkspacesUpdateTest.php in core/modules/workspaces/tests/src/Functional/Update/WorkspacesUpdateTest.php
WorkspaceTestTrait.php in core/modules/workspaces/tests/src/Kernel/WorkspaceTestTrait.php
WorkspaceTestUtilities.php in core/modules/workspaces/tests/src/Functional/WorkspaceTestUtilities.php
WorkspaceViewTest.php in core/modules/workspaces/tests/src/Functional/WorkspaceViewTest.php

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