Add test for ruby-build definitions

#!/usr/bin/env bats

load test_helper

NUM_DEFINITIONS="$(ls "$BATS_TEST_DIRNAME"/../share/ruby-build | wc -l)"

@test "list built-in definitions" {

  run ruby-build --definitions

  assert_success

  assert_output_contains "1.9.3-p194"

  assert_output_contains "jruby-1.7.9"

  assert [ "${#lines[*]}" -eq "$NUM_DEFINITIONS" ]

}

@test "installing nonexistent definition" {

  run ruby-build "nonexistent" "${TMP}/install"

  assert [ "$status" -eq 2 ]

  assert_output "ruby-build: definition not found: nonexistent"

}