Extend <sys/sysinfo.h> tests slightly.

We know game developers (and the Games SDK) look at this stuff, so make
a bit more of an effort to ensure it's not completely broken.

Test: treehugger
Change-Id: I20b1c167faa1d9f4f39a94a723dabb848ce34269

tests/sys_sysinfo_test.cpp

diff --git a/tests/sys_sysinfo_test.cpp b/tests/sys_sysinfo_test.cpp
index ea35b4e..cca2f44 100644
--- a/tests/sys_sysinfo_test.cpp
+++ b/tests/sys_sysinfo_test.cpp
@@ -42,4 +42,10 @@
   struct sysinfo si;
   memset(&si, 0, sizeof(si));
   ASSERT_EQ(0, sysinfo(&si));
+
+  ASSERT_GT(si.uptime, 10);  // You're not running CTS within 10s of booting!
+  ASSERT_GT(uint64_t(si.totalram) * si.mem_unit, uint64_t(512 * 1024 * 1024));
+  ASSERT_GE(si.totalram, si.freeram);
+  ASSERT_GE(si.totalswap, si.freeswap);
+  ASSERT_GT(si.procs, 2);  // There's at least this test and init running!
 }