test: the attributeMappings X.509v3 extension

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/26157)

test/certs/ext-attributeMappings.pem

@@ -0,0 +1,12 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

test/recipes/25-test_x509.t

@@ -16,7 +16,7 @@ use OpenSSL::Test qw/:DEFAULT srctop_file/;
 
 setup("test_x509");
 
-plan tests => 122;
+plan tests => 124;
 
 # Prevent MSys2 filename munging for arguments that look like file paths but
 # aren't
@@ -391,6 +391,16 @@ cert_contains($time_spec_per_cert,
               "Years: 2023, 2024",
               1, 'X.509 Time Specification (Periodic)');
 
+my $attr_map_cert = srctop_file(@certs, "ext-attributeMappings.pem");
+cert_contains($attr_map_cert,
+              "commonName == localityName",
+              1, 'X.509 Attribute Mappings');
+# localityName has an INTEGER value here, which was intentional to test the
+# display of non-string values.
+cert_contains($attr_map_cert,
+              "commonName:asdf == localityName:03:3E",
+              1, 'X.509 Attribute Mappings');
+
 sub test_errors { # actually tests diagnostics of OSSL_STORE
     my ($expected, $cert, @opts) = @_;
     my $infile = srctop_file(@certs, $cert);