Add DNS, TLS, and IP address tests

[currantw]

Summary

Add integration tests for

• DNS resolution (with and without TLS)
• IPv4/IPv6 connectivity (with and without TLS)

for the PHP Valkey GLIDE client.

Issue link

⚪ None

Features / Behaviour Changes

Add new DNS and IP address connectivity tests. See more details below.

Implementation

New Tests

ValkeyGlideDnsTest.php: DNS resolution tests with and without TLS for standalone:

• Non-TLS connection succeeds with valid hostname.
• Non-TLS connection fails with invalid hostname.
• TLS connection succeeds with hostname present in certificate SAN.
• TLS connection fails with hostname not in certificate SAN.

ValkeyGlideClusterDnsTest.php: DNS resolution tests with and without TLS for cluster:

• Non-TLS connection succeeds with valid hostname.
• Non-TLS connection fails with invalid hostname.
• TLS connection succeeds with hostname present in certificate SAN.
• TLS connection fails with hostname not in certificate SAN.

ValkeyGlideTlsTest.php: Comprehensive TLS tests for standalone including IP address connectivity:

• TLS connection succeeds with IPv4 address (127.0.0.1).
• TLS connection succeeds with IPv6 address (::1).
• Certificate validation tests (empty, invalid, multiple certificates).

ValkeyGlideClusterTlsTest.php: Comprehensive TLS tests for cluster including IP address connectivity:

• TLS connection succeeds with IPv4 address (127.0.0.1).
• TLS connection succeeds with IPv6 address (::1).
• Certificate validation tests (empty, invalid, multiple certificates).

ValkeyGlideTest.php and ValkeyGlideClusterTest.php enhancements: Add non-TLS IP address connectivity tests:

• Connection succeeds with IPv4 address (127.0.0.1).
• Connection succeeds with IPv6 address (::1).

DNS tests require hostname mappings and the environment variable VALKEY_GLIDE_DNS_TESTS_ENABLED to be set.

Test Infrastructure Improvements

• Add test utility helpers in ValkeyGlideBaseTest.php: assertConnected(), skipIfTlsDisabled(), skipIfTlsEnabled(), getCaCertificate(), and skipIfDnsNotEnabled().
• Add assertThrows() helper to TestSuite.php for exception testing.
• Add constants for hostnames and IP addresses to ValkeyGlideBaseTest.php.
• Reorganized TLS tests from main test files into dedicated TLS test files.
• Updated server configuration scripts to bind to both IPv4 and IPv6.
• Added stop-servers.sh script for cleanup.

Limitations

DNS tests require host file entries mapping valkey.glide.test.tls.com and valkey.glide.test.no_tls.com to 127.0.0.1 and ::1. These must be configured manually for local development (automatically configured in CI).

Testing

See New Tests above.

Related Issues

• Go implementation: feat(go): Add DNS, TLS, and IP address tests valkey-glide#5479
• Python implementation: feat(python): Add DNS, TLS, and IP address tests valkey-glide#5465
• Java implementation: feat(java): Add DNS and TLS tests valkey-glide#5419
• Rust implementation: feat(rust): Add DNS and TLS tests valkey-glide#5436
• C# implementation: Add DNS and TLS tests valkey-glide-csharp#215

Checklist

Before submitting the PR make sure the following are checked:

• This Pull Request is related to one issue.
• Commit message has a detailed description of what changed and why.
• Tests are added or updated.
• CHANGELOG.md and documentation files are updated.
• Linters have been run and pass.
• Destination branch is correct - main or release
• Create merge commit if merging release branch into main, squash otherwise.

[prateek-kumar-improving]

Shouldn't we always run the tests? Don't see any situation why we would skip those and not want them to run. We don't have this we any other test types.
If we want to have this functionality, could you please document this in a comment under which conditions will it be useful to skip these tests?

[prateek-kumar-improving]

Saw your commit message that this file is auto-generated. Is it auto-generated on local and needs to to be commited?

[prateek-kumar-improving]

Are these new tests getting picked on CI? You might need to add the following to TestValkeyGlide.php:

1. Add require_once __DIR__ . "/ValkeyGlideDnsTest.php";
2. Entries to $valid_classes array: 'valkeyglidedns' => 'ValkeyGlideDnsTest',
3. $default_classes .= 'valkeyglidetls,valkeyglideclustertls,valkeyglidedns,valkeyglideclusterdns';

Can you check if it is required in your case and check if the tests are actually running?

[prateek-kumar-improving]

Please remove the check mark.