global dns cache: didn't work [regression]

CURLOPT_DNS_USE_GLOBAL_CACHE broke in commit c43127414d89ccb (been
broken since the libcurl 7.29.0 release). While this option has been
documented as deprecated for almost a decade and nobody even reported
this bug, it should remain functional.

Added test case 1512 to verify

1 files changed, 80 insertions, 0 deletions

diff --git a/tests/data/test1512 b/tests/data/test1512
new file mode 100644
index 000000000..9d2134b2a
--- /dev/null
+++ b/tests/data/test1512
@@ -0,0 +1,80 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+GLOBAL DNS CACHE
+</keywords>
+</info>
+
+# Server-side
+<reply>
+<data1>
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 47
+
+file contents should appear once for each file
+</data1>
+<data2>
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 47
+
+file contents should appear once for each file
+</data2>
+<data3>
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 47
+
+file contents should appear once for each file
+</data3>
+<data4>
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 47
+
+file contents should appear once for each file
+</data4>
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+<tool>
+lib1512
+</tool>
+ <name>
+GLOBAL CACHE test over two easy performs
+ </name>
+ <command>
+http://%HOSTIP:%HTTPPORT/path/1512 %HOSTIP %HTTPPORT
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<protocol>
+GET /path/15120001 HTTP/1.1

+Host: %HOSTIP:%HTTPPORT

+Accept: */*

+

+GET /path/15120002 HTTP/1.1

+Host: %HOSTIP:%HTTPPORT

+Accept: */*

+

+</protocol>
+<strip>
+^Host:.*
+</strip>
+<stripfile>
+$_ = '' if (($_ !~ /left intact/) && ($_ !~ /Closing connection/))
+</stripfile>
+</verify>
+</testcase>