[Truffle] Add coverage test to catch-all.

Author: chrisseaton

test/truffle/coverage/subject.rb

@@ -0,0 +1,21 @@
+a = 1
+b = 2
+
+10.times do
+  c = 3
+end
+
+d = 4
+
+if d == 4
+  e = 5
+end
+
+def foo
+  f = 6
+end
+
+foo
+foo
+
+g = 7

test/truffle/coverage/test.rb

@@ -0,0 +1,12 @@
+require 'coverage'
+
+Coverage.start
+
+require_relative 'subject.rb'
+
+data = Coverage.result.values.first
+expected = [1, 1, nil, 1, 10, nil, nil, 1, nil, 1, 1, nil, nil, 1, 2, nil, nil, 1, 1, nil, 1]
+
+p data
+
+raise 'failed' unless data == expected

test/truffle/run.sh

@@ -45,3 +45,6 @@ wait_until_port_open
 curl http://localhost:$PORT/
 kill -9 $!
 wait
+
+echo "Coverage..."
+jt run -Xtruffle.coverage=true test/truffle/coverage/test.rb