The tests expect themselves to be executed on Linux where you have maximally
1024 allowable file descriptors. If executed in Solaris, the soft limit is set
to 256 by default which makes the test fail.

This patch increases the number of available file descriptors to a process.

--- dbus-1.10.0/test/fdpass.c	2017-05-25 21:51:08.806467183 +0000
+++ dbus-1.10.0/test/fdpass.c	2017-05-25 21:50:46.967550466 +0000
@@ -813,6 +813,10 @@ main (int argc,
       if (getrlimit (RLIMIT_NOFILE, &lim) < 0)
         g_error ("Failed to get RLIMIT_NOFILE limit: %s", g_strerror (errno));

+      lim.rlim_cur = 65535;
+      lim.rlim_max = 65535;
+      setrlimit(RLIMIT_NOFILE, &lim);
+
       if (lim.rlim_cur != RLIM_INFINITY &&
           /* only run if we have a fairly generous margin of error
            * for stdout, stderr, duplicates, the D-Bus connection, etc. */