minor #51297 [Process] fix tests (nicolas-grekas)

This PR was merged into the 6.4 branch.

Discussion
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[Process] fix tests

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

- `testFindProcessInOpenBasedir` is a duplicate of `testFindWithOpenBaseDir`
- `testFindWithOpenBaseDir` currently expects that we search open_basedir instead of PATH when the setting is set, but this doesn't really make sense, and #47422 removed this behavior
- `PhpSubprocessTest::testSubprocess` expects a php that defaults to memory_limit=-1, which is not the case currently for the sigchild-enabled binary

Commits
-------

4ca4417c1a [Process] fix tests

Author: nicolas-grekas

Tests/ExecutableFinderTest.php

@@ -98,6 +98,7 @@ public function testFindWithOpenBaseDir()
             $this->markTestSkipped('Cannot test when open_basedir is set');
         }
 
+        putenv('PATH='.\dirname(\PHP_BINARY));
         $this->iniSet('open_basedir', \dirname(\PHP_BINARY).\PATH_SEPARATOR.'/');
 
         $finder = new ExecutableFinder();
@@ -106,26 +107,6 @@ public function testFindWithOpenBaseDir()
         $this->assertSamePath(\PHP_BINARY, $result);
     }
 
-    /**
-     * @runInSeparateProcess
-     */
-    public function testFindProcessInOpenBasedir()
-    {
-        if (\ini_get('open_basedir')) {
-            $this->markTestSkipped('Cannot test when open_basedir is set');
-        }
-        if ('\\' === \DIRECTORY_SEPARATOR) {
-            $this->markTestSkipped('Cannot run test on windows');
-        }
-
-        $this->iniSet('open_basedir', \PHP_BINARY.\PATH_SEPARATOR.'/');
-
-        $finder = new ExecutableFinder();
-        $result = $finder->find($this->getPhpBinaryName(), false);
-
-        $this->assertSamePath(\PHP_BINARY, $result);
-    }
-
     public function testFindBatchExecutableOnWindows()
     {
         if (\ini_get('open_basedir')) {