[#3127] Restored the process environment after every installer test.

[AlexSkrypnyk]

Closes #3127

Summary

UnitTestCase::setUp() (.vortex/installer/tests/Unit/UnitTestCase.php) now snapshots getenv(), $_ENV and $_SERVER, and a new envRestore() called from tearDown() unsets every name the test added, resets every name whose value it changed, and reassigns both superglobals.

EnvTrait::envReset() reverses only names recorded through envSet(), so when a functional test's runNonInteractiveInstall() drove OptionsResolver::resolve() into Env::putFromDotenv(), the raw putenv() that method issues for each variable in the installed project's .env went untracked; any later test in the same process whose handler called Env::getFromDotenv() then read VORTEX_PROJECT=sut ahead of its own fixture, and machine_name, domain, module_prefix and theme came back as sut.

AbstractHandlerDiscoveryTestCase and AbstractHandlerProcessTestCase now share one UnitTestCase::envUnsetProjectVars() covering the VORTEX_, DRUPAL_ and LAGOON_ prefixes plus WEBROOT and TZ, EnvTest drops its own $_ENV/$_SERVER backup as redundant, and SelfTest gains a #[Depends] pair proving a raw putenv() does not outlive the test that issued it; nothing under src/ changes, and no fixture or snapshot is regenerated.

Before / After

Before
──────

  functional test                        unit test (same PHP process)
  ───────────────                        ───────────────────────────
  Env::putFromDotenv()
    putenv('VORTEX_PROJECT=sut')  ───┐
                                     │  process env still holds 'sut'
  tearDown()                         │
    envReset()  ─ reverses only      │
                  envSet() names,    │
                  so 'sut' survives  │
                                     └─▶ Env::getFromDotenv('VORTEX_PROJECT')
                                           returns 'sut', not the fixture
                                           machine_name / domain /
                                           module_prefix / theme  ->  'sut'   ✗

After
─────

  functional test                        unit test (same PHP process)
  ───────────────                        ───────────────────────────
  setUp()
    snapshot getenv(), $_ENV, $_SERVER

  Env::putFromDotenv()
    putenv('VORTEX_PROJECT=sut')

  tearDown()
    envReset()
    envRestore()  ─ unsets added names,
                    resets changed ones,
                    so 'sut' is gone   ──▶ Env::getFromDotenv('VORTEX_PROJECT')
                                             reads the fixture's own .env       ✓

Root cause

.vortex/installer/phpunit.xml sets executionOrder="depends,defects". Defect ordering is driven by the PHPUnit result cache at .phpunit.cache/test-results, which .vortex/installer/.gitignore:3 excludes from version control. CI checks out fresh with no cache, so the suite runs in declaration order, tests/Unit before tests/Functional in the default testsuite, and no functional test ever executes before a unit test. Locally the cache persists, so once any test is recorded as defective PHPUnit hoists it to the front and interleaves unit tests after functional ones, which is why the leak reproduced on a developer machine and never in CI.

The leak was never limited to VORTEX_. The template .env also defines WEBROOT, TZ, DRUPAL_PROFILE, DRUPAL_THEME, DRUPAL_STAGE_FILE_PROXY_ORIGIN and LAGOON_PROJECT, and handlers read every one of them through Env::getFromDotenv(). The four values that surfaced as failures were only the ones where the system under test differed from the fixture; the rest coincided and would have broken on the next fixture change.

Changes

• .vortex/installer/tests/Unit/UnitTestCase.php: backs up getenv(), $_ENV and $_SERVER in setUp(); adds envRestore(), called from tearDown(), which unsets names added during the test, resets names whose value changed, and reassigns both superglobals; adds envUnsetProjectVars() stating once the variables a project .env can define.
• .vortex/installer/tests/Unit/Prompts/Handlers/AbstractHandlerDiscoveryTestCase.php: calls envUnsetProjectVars() in setUp(), so no discovery test can read a variable exported by the shell running the suite.
• .vortex/installer/tests/Functional/Prompts/Handlers/AbstractHandlerProcessTestCase.php: replaces its five inline envUnsetPrefix() and envUnset() calls with the shared envUnsetProjectVars().
• .vortex/installer/tests/Unit/Utils/EnvTest.php: drops the $backupEnv/$backupServer fields and the setUp()/tearDown() pair that maintained them.
• .vortex/installer/tests/Unit/SelfTest.php: adds a #[Depends] pair (testEnvRestore1WriteRawValues / testEnvRestore2VerifyRestored) that writes with raw putenv(), mutates a variable seeded in setUpBeforeClass(), and asserts the added name is gone and the changed one restored; setUpBeforeClass() captures the seeded variable's prior value and tearDownAfterClass() puts it back, unsetting it only when it was originally absent.

Verification

• Full installer suite: 1666 tests, 0 failures, with the result cache primed to the defect ordering that previously produced 221 failures.
• Full installer suite with the result cache cleared, so tests run in CI's declaration order: 1666 tests, 0 failures.
• composer lint in .vortex/installer: clean across phpcs, phpstan and rector.

Screenshots

N/A

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---

Walkthrough

The test framework now snapshots and restores process environment state, $_ENV, and $_SERVER. Handler tests use shared project-variable cleanup. New tests verify cleanup of raw environment changes.

Changes

Environment isolation

Layer / File(s)	Summary
Environment snapshot and restoration .vortex/installer/tests/Unit/UnitTestCase.php	UnitTestCase captures environment state during setup and restores process variables and superglobals during teardown.
Environment restoration regression tests .vortex/installer/tests/Unit/SelfTest.php	SelfTest writes raw environment values and verifies that test-specific values are removed while ambient state is restored.
Project environment cleanup integration .vortex/installer/tests/Functional/Prompts/Handlers/AbstractHandlerProcessTestCase.php, .vortex/installer/tests/Unit/Prompts/Handlers/AbstractHandlerDiscoveryTestCase.php, .vortex/installer/tests/Unit/Utils/EnvTest.php	Handler setup uses shared project-variable cleanup. EnvTest removes duplicate superglobal restoration logic.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 4a9f5

Installer tests now restore environment state between tests, preventing leaked variables from affecting subsequent test behavior. The change is covered by restoration regression tests and is ready to merge.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 41.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the primary change: restoring the process environment after installer tests to prevent leaked variables from affecting later tests.
Linked Issues check	✅ Passed	The changes address issue #3127 by restoring process environment state after each test, clearing project variables before handler tests, and adding regression coverage for leaked environment values.
Out of Scope Changes check	✅ Passed	The changes remain within scope. Test isolation, shared environment cleanup, regression tests, and removal of redundant fixture restoration directly support issue #3127.

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---

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Inline comments:
In @.vortex/installer/tests/Unit/SelfTest.php:
- Line 24: Update setUpBeforeClass() to capture the original
VORTEX_TEST_AMBIENT_VAR state before overwriting it, then update
tearDownAfterClass() to restore that value when present and unset the variable
only when it was originally absent.

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• .vortex/installer/tests/Functional/Prompts/Handlers/AbstractHandlerProcessTestCase.php
• .vortex/installer/tests/Unit/Prompts/Handlers/AbstractHandlerDiscoveryTestCase.php
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• .vortex/installer/tests/Unit/UnitTestCase.php
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Codecov Report

❌ Patch coverage is 63.15789% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.65%. Comparing base (cb12b70) to head (4a9f591).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.vortex/installer/tests/Unit/UnitTestCase.php	70.58%	5 Missing ⚠️
...rompts/Handlers/AbstractHandlerProcessTestCase.php	0.00%	1 Missing ⚠️
...mpts/Handlers/AbstractHandlerDiscoveryTestCase.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3129      +/-   ##
==========================================
- Coverage   87.01%   86.65%   -0.37%     
==========================================
  Files         113      106       -7     
  Lines        5237     5088     -149     
  Branches       49        3      -46     
==========================================
- Hits         4557     4409     -148     
+ Misses        680      679       -1     

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Code coverage (threshold: 90%)

  Classes: 100.00% (1/1)
  Methods: 100.00% (2/2)
  Lines:   100.00% (230/230)

Per-class coverage

Drupal\ys_demo\Plugin\Block\CounterBlock
  Methods: 100.00% ( 2/ 2)   Lines: 100.00% ( 10/ 10)

[AlexSkrypnyk]

Code coverage (threshold: 90%)

  Classes: 100.00% (1/1)
  Methods: 100.00% (2/2)
  Lines:   100.00% (230/230)

Per-class coverage

Drupal\ys_demo\Plugin\Block\CounterBlock
  Methods: 100.00% ( 2/ 2)   Lines: 100.00% ( 10/ 10)