Refined assertion messages

test/ruby/test_process.rb

@@ -246,18 +246,16 @@ class TestProcess < Test::Unit::TestCase
     assert_raise(ArgumentError) do
       system(RUBY, '-e', 'exit',  'rlimit_bogus'.to_sym => 123)
     end
-    assert_separately([],"#{<<-"begin;"}\n#{<<~'end;'}")
+    assert_separately([],"#{<<~"begin;"}\n#{<<~'end;'}", 'rlimit_cpu'.to_sym => 3600)
     BUG = "[ruby-core:82033] [Bug #13744]"
-    RUBY = "#{RUBY}"
     begin;
-      assert(system("#{RUBY}", "-e",
-                 "exit([3600,3600] == Process.getrlimit(:CPU))",
-             'rlimit_cpu'.to_sym => 3600), BUG)
-      assert_raise(ArgumentError, BUG) do
-        system("#{RUBY}", '-e', 'exit',  :rlimit_bogus => 123)
-      end
+      assert_equal([3600,3600], Process.getrlimit(:CPU), BUG)
     end;
 
+    assert_raise_with_message(ArgumentError, /bogus/) do
+      system(RUBY, '-e', 'exit', :rlimit_bogus => 123)
+    end
+
     assert_raise_with_message(ArgumentError, /rlimit_cpu/) {
       system(RUBY, '-e', 'exit', "rlimit_cpu\0".to_sym => 3600)
     }
@@ -636,7 +634,7 @@ class TestProcess < Test::Unit::TestCase
       rescue NotImplementedError
         return
       end
-      assert(FileTest.pipe?("fifo"), "should be pipe")
+      assert_file.pipe?("fifo")
       t1 = Thread.new {
         system(*ECHO["output to fifo"], :out=>"fifo")
       }
@@ -1635,7 +1633,7 @@ class TestProcess < Test::Unit::TestCase
         w.puts
       end
       Process.wait pid
-      assert sig_r.wait_readable(5), 'self-pipe not readable'
+      assert_send [sig_r, :wait_readable, 5], 'self-pipe not readable'
     end
     if RubyVM::MJIT.enabled? # checking -DMJIT_FORCE_ENABLE. It may trigger extra SIGCHLD.
       assert_equal [true], signal_received.uniq, "[ruby-core:19744]"
@@ -2260,7 +2258,7 @@ EOS
     th = Process.detach(pid)
     assert_equal pid, th.pid
     status = th.value
-    assert status.success?, status.inspect
+    assert_predicate status, :success?
   end if defined?(fork)
 
   def test_kill_at_spawn_failure