run-tests: use the EXTENSIONS section for skipping

Currently, most skip checks are just for making sure an extension is
available. Even with recent addition of skip caching, this makes tests
needlessly slow:
* Checks for the same extension in its tests can have small differences
  impacting cacheability.
* Even identical skip checks in two tests can still be executed twice if
  they're run by different workers.

To remedy this, I'm repurposing the existing --EXTENSIONS-- section of
.phpt files to specify wjich extensions are required for current test to
run. Current behavior:
1) If the extension is already visible to PHP, all is good
2) If it isn't, assume it's present as a shared module and attempt to add
   it via a command line parameter
3) If that works, all is good
4) If it doesn't, PHP fails with a cryptic error message trying to
   execute the test itself

After this commit:
1) and 2) are kept unchanged
3) Check if shared extension file from 2) is actually present
4) Skip the test if it isn't

Other benefits include clear skip reasons (vs. sometimes none in many
current skip checks) and moving test information from code to metadata,
opening more opportunities for search and analysis.

Since --EXTENSIONS-- is barely ever used, this change poses no risk of
hidden failures.

As a demonstration of the new approach, this commit migrates one
extension to it. If merged, I will migrate other extensions in
subsequent PRs.

Closes GH-6787.

ext/sodium/tests/bug78114.phpt

@@ -1,9 +1,7 @@
 --TEST--
 Bug #78114 (segfault when calling sodium_* functions from eval)
---SKIPIF--
-<?php
-if (!extension_loaded('sodium')) die('skip sodium extension not available');
-?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 try {

ext/sodium/tests/bug78516.phpt

@@ -1,8 +1,9 @@
 --TEST--
 Bug #78516 (password_hash(): Memory cost is not in allowed range)
+--EXTENSIONS--
+sodium
 --SKIPIF--
 <?php
-if (!extension_loaded('sodium')) die('skip sodium extension not available');
 if (!defined('PASSWORD_ARGON2ID')) die('skip PASSWORD_ARGON2ID not available');
 ?>
 --FILE--

ext/sodium/tests/crypto_aead.phpt

@@ -1,8 +1,9 @@
 --TEST--
 Check for libsodium AEAD
+--EXTENSIONS--
+sodium
 --SKIPIF--
 <?php
-if (!extension_loaded("sodium")) print "skip extension not loaded";
 if (!defined('SODIUM_CRYPTO_AEAD_AES256GCM_NPUBBYTES')) print "skip libsodium without AESGCM";
 ?>
 --FILE--

ext/sodium/tests/crypto_auth.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Check for libsodium auth
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 $msg = random_bytes(1000);

ext/sodium/tests/crypto_box.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Check for libsodium box
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 $keypair = sodium_crypto_box_keypair();

ext/sodium/tests/crypto_generichash.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Check for libsodium generichash
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 $q = sodium_crypto_generichash('msg');

ext/sodium/tests/crypto_hex.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Check for libsodium bin2hex
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 $bin = random_bytes(random_int(1, 1000));

ext/sodium/tests/crypto_kdf.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Check for libsodium KDF
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 $key = sodium_crypto_kdf_keygen();

ext/sodium/tests/crypto_kx.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Check for libsodium-based key exchange
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 $client_seed = sodium_hex2bin('0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef');

ext/sodium/tests/crypto_scalarmult.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Check for libsodium scalarmult
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 $n = sodium_hex2bin("5dab087e624a8a4b79e17f8b83800ee66f3bb1292618b6fd1c2f8b27ff88e0eb");

ext/sodium/tests/crypto_secretbox.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Check for libsodium secretbox
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 $nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);

ext/sodium/tests/crypto_secretstream.phpt

@@ -1,8 +1,9 @@
 --TEST--
 Check for libsodium secretstream
+--EXTENSIONS--
+sodium
 --SKIPIF--
 <?php
-if (!extension_loaded("sodium")) print "skip extension not loaded";
 if (!defined('SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES')) print "skip libsodium without secretbytes";
 ?>
 --FILE--

ext/sodium/tests/crypto_shorthash.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Check for libsodium shorthash
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 $m1 = 'message';

ext/sodium/tests/crypto_sign.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Check for libsodium ed25519 signatures
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 $keypair = sodium_crypto_sign_keypair();

ext/sodium/tests/crypto_stream.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Check for libsodium stream
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 $nonce = random_bytes(SODIUM_CRYPTO_STREAM_NONCEBYTES);

ext/sodium/tests/exception_trace_without_args.phpt

@@ -1,7 +1,7 @@
 --TEST--
 SodiumException backtraces do not contain function arguments
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 

ext/sodium/tests/inc_add.phpt

@@ -1,7 +1,7 @@
 --TEST--
 increment and add edge cases
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 

ext/sodium/tests/installed.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Check for sodium presence
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 echo "sodium extension is available";

ext/sodium/tests/pwhash_argon2i.phpt

@@ -1,7 +1,9 @@
 --TEST--
 Check for libsodium argon2i
+--EXTENSIONS--
+sodium
 --SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip";
+<?php
 if (!defined('SODIUM_CRYPTO_PWHASH_SALTBYTES')) print "skip libsodium without argon2i"; ?>
 --FILE--
 <?php

ext/sodium/tests/pwhash_scrypt.phpt

@@ -1,7 +1,9 @@
 --TEST--
 Check for libsodium scrypt
+--EXTENSIONS--
+sodium
 --SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip";
+<?php
 if (!defined('SODIUM_CRYPTO_PWHASH_SCRYPTSALSA208SHA256_SALTBYTES')) print "skip libsodium without scrypt"; ?>
 --FILE--
 <?php

ext/sodium/tests/sodium_error_001.phpt

@@ -1,7 +1,7 @@
 --TEST--
 TypeErrors will not contain param values in backtrace
---SKIPIF--
-<?php if (!extension_loaded("sodium")) die("skip ext/sodium required"); ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 declare(strict_types=1);

ext/sodium/tests/utils.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Check for libsodium utils
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 $a = 'test';

ext/sodium/tests/version.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Check for libsodium version
---SKIPIF--
-<?php if (!extension_loaded("sodium")) print "skip"; ?>
+--EXTENSIONS--
+sodium
 --FILE--
 <?php
 echo strlen(SODIUM_LIBRARY_VERSION) >= 5;

run-tests.php

@@ -2057,15 +2057,26 @@ TEST $file
         $extensions = preg_split("/[\n\r]+/", trim($test->getSection('EXTENSIONS')));
         [$ext_dir, $loaded] = $skipCache->getExtensions("$php $pass_options $extra_options $ext_params $no_file_cache");
         $ext_prefix = IS_WINDOWS ? "php_" : "";
+        $missing = [];
         foreach ($extensions as $req_ext) {
             if (!in_array($req_ext, $loaded)) {
                 if ($req_ext == 'opcache') {
-                    $ini_settings['zend_extension'][] = $ext_dir . DIRECTORY_SEPARATOR . $ext_prefix . $req_ext . '.' . PHP_SHLIB_SUFFIX;
+                    $ext_file = $ext_dir . DIRECTORY_SEPARATOR . $ext_prefix . $req_ext . '.' . PHP_SHLIB_SUFFIX;
+                    $ini_settings['zend_extension'][] = $ext_file;
                 } else {
-                    $ini_settings['extension'][] = $ext_dir . DIRECTORY_SEPARATOR . $ext_prefix . $req_ext . '.' . PHP_SHLIB_SUFFIX;
+                    $ext_file = $ext_dir . DIRECTORY_SEPARATOR . $ext_prefix . $req_ext . '.' . PHP_SHLIB_SUFFIX;
+                    $ini_settings['extension'][] = $ext_file;
+                }
+                if (!is_readable($ext_file)) {
+                    $missing[] = $req_ext;
                 }
             }
         }
+        if ($missing) {
+            $message = 'Required extension' . (count($missing) > 1 ? 's' : '')
+                . ' missing: ' . implode(', ', $missing);
+            return skip_test($tested, $tested_file, $shortname, $message);
+        }
     }
 
     // additional ini overwrites

tests/run-test/bug75042-2.phpt

@@ -1,10 +0,0 @@
---TEST--
-phpt EXTENSIONS directive with static module
---EXTENSIONS--
-SPL
---FILE--
-<?php
-var_dump(extension_loaded('spl'));
-?>
---EXPECT--
-bool(true)

tests/run-test/bug75042-3.phpt

@@ -1,13 +0,0 @@
---TEST--
-phpt EXTENSIONS directive with nonexistent shared module
---INI--
-error_log=
-display_startup_errors=1
-display_errors=1
---EXTENSIONS--
-nonexistentsharedmodule
---FILE--
-<?php
-?>
---EXPECTF--
-Warning: PHP Startup: Unable to load dynamic library '%snonexistentsharedmodule.%s' %A

tests/run-test/extensions-shared.phpt

@@ -1,5 +1,7 @@
 --TEST--
-phpt EXTENSIONS directive with shared module
+phpt EXTENSIONS directive - shared module
+--EXTENSIONS--
+openssl
 --SKIPIF--
 <?php
 $php = getenv('TEST_PHP_EXECUTABLE');
@@ -8,8 +10,7 @@ if (false !== stripos(`$php -n -m`, 'openssl')) {
 }
 $ext_module = ini_get('extension_dir') . DIRECTORY_SEPARATOR . (substr(PHP_OS, 0, 3) === "WIN" ? "php_openssl." : "openssl.") . PHP_SHLIB_SUFFIX;
 if( !file_exists($ext_module) ) die('skip openssl shared extension not found');
---EXTENSIONS--
-openssl
+
 --FILE--
 <?php
 var_dump(extension_loaded('openssl'));

tests/run-test/extensions-static.phpt

@@ -0,0 +1,9 @@
+--TEST--
+phpt EXTENSIONS directive - static extension is present
+--EXTENSIONS--
+standard
+--FILE--
+<?php
+var_dump(extension_loaded('standard'));
+--EXPECT--
+bool(true)