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diff --git a/test/covshow.rb b/test/covshow.rb
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+# -*- encoding: binary -*-
+# Copyright (C) 2013, Eric Wong <normalperson@yhbt.net>
+# License: GPLv3 or later (https://www.gnu.org/licenses/gpl-3.0.txt)
+#
+# this works with the __covmerge method in test/helper.rb
+# run this file after all tests are run
+
+# load the merged dump data
+res = Marshal.load(IO.binread("coverage.dump"))
+
+# Dirty little text formatter.  I tried simplecov but the default
+# HTML+JS is unusable without a GUI (I hate GUIs :P) and it would've
+# taken me longer to search the Internets to find a plain-text
+# formatter I like...
+res.keys.sort.each do |filename|
+  cov = res[filename]
+  puts "==> #{filename} <=="
+  File.readlines(filename).each_with_index do |line, i|
+    n = cov[i]
+    if n == 0 # BAD
+      print("  *** 0 #{line}")
+    elsif n
+      printf("% 7u %s", n, line)
+    elsif line =~ /\S/ # probably a line with just "end" in it
+      print("        #{line}")
+    else # blank line
+      print "\n" # don't output trailing whitespace on blank lines
+    end
+  end
+end