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.

4 files changed, 13 insertions, 26 deletions

diff --git a/tests/run-test/bug75042-2.phpt b/tests/run-test/bug75042-2.phpt
deleted file mode 100644
index 2c5718a9a0..0000000000
--- a/tests/run-test/bug75042-2.phpt
+++ /dev/null
@@ -1,10 +0,0 @@
---TEST--
-phpt EXTENSIONS directive with static module
---EXTENSIONS--
-SPL
---FILE--
-<?php
-var_dump(extension_loaded('spl'));
-?>
---EXPECT--
-bool(true)
diff --git a/tests/run-test/bug75042-3.phpt b/tests/run-test/bug75042-3.phpt
deleted file mode 100644
index 5a30143be9..0000000000
--- a/tests/run-test/bug75042-3.phpt
+++ /dev/null
@@ -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
diff --git a/tests/run-test/bug75042.phpt b/tests/run-test/extensions-shared.phpt
index a7979d6b5e..e8d9b52aa9 100644
--- a/tests/run-test/bug75042.phpt
+++ b/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'));
diff --git a/tests/run-test/extensions-static.phpt b/tests/run-test/extensions-static.phpt
new file mode 100644
index 0000000000..19e883e0ba
--- /dev/null
+++ b/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)