test: persistent curl share handles

I opted to use the existing Caddy testing infrastructure since it
supports keepalives, whereas it seems the PHP development server does
not.

Alternatively I could write just enough of a socket listener to confirm
that there is only ever a single connection coming from curl, but I
believe it is safe to rely on connect_time being zero when a connection
is reused.

Author: ericnorris

ext/curl/tests/curl_share_persistent.phpt

@@ -0,0 +1,44 @@
+--TEST--
+Basic curl_share test
+--EXTENSIONS--
+curl
+--SKIPIF--
+<?php
+include 'skipif-nocaddy.inc';
+?>
+--FILE--
+<?php
+
+function get_persistent_share_handle(): CurlShareHandle {
+    return curl_share_init(
+        [
+            CURL_LOCK_DATA_CONNECT,
+        ],
+        "persistent-test",
+    );
+}
+
+$sh1 = get_persistent_share_handle();
+$ch1 = curl_init("https://localhost");
+
+curl_setopt($ch1, CURLOPT_SSL_VERIFYPEER, false);
+curl_setopt($ch1, CURLOPT_RETURNTRANSFER, true);
+curl_setopt($ch1, CURLOPT_SHARE, $sh1);
+
+$sh2 = get_persistent_share_handle();
+$ch2 = curl_init("https://localhost");
+
+curl_setopt($ch2, CURLOPT_SSL_VERIFYPEER, false);
+curl_setopt($ch2, CURLOPT_RETURNTRANSFER, true);
+curl_setopt($ch2, CURLOPT_SHARE, $sh2);
+
+var_dump(curl_exec($ch1));
+var_dump(curl_exec($ch2));
+
+var_dump("second connect_time: " . (curl_getinfo($ch2)["connect_time"]));
+
+?>
+--EXPECT--
+string(23) "Caddy is up and running"
+string(23) "Caddy is up and running"
+string(22) "second connect_time: 0"

ext/curl/tests/skipif-nocaddy.inc

@@ -2,6 +2,7 @@
 
 $ch = curl_init("https://localhost");
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
 
 $body = curl_exec($ch);