Test suite: use test/test_environment as busted helper

When parsing test options, instead of directly looking
for '-Xhelper' in arguments and splitting the next arguments on commas
add .busted config to set test/test_environment as busted helper.
Then busted will do the splitting on its own and set global arg to
split options.

1 files changed, 5 insertions, 0 deletions

diff --git a/.busted b/.busted
new file mode 100644
index 00000000..7c67e719
--- /dev/null
+++ b/.busted
@@ -0,0 +1,5 @@
+return {
+   default = {
+      helper = "test/test_environment"
+   }
+}