ArsMagicaで成功失敗判定ができない問題を修正

[ysakasin]

ArsMagicaのテストで成功失敗判定のテストケースがなかったため、 DiceBot#check_result のリファクタリング(#145)で修正漏れしていた。

問題を修正し、該当するテストケースを追加。
また、重複するテストケースを排除。

[codecov-io]

Codecov Report

Merging #167 into master will increase coverage by 0.40%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #167      +/-   ##
==========================================
+ Coverage   86.21%   86.61%   +0.40%     
==========================================
  Files         199      204       +5     
  Lines       21072    21657     +585     
==========================================
+ Hits        18167    18759     +592     
+ Misses       2905     2898       -7     

Impacted Files	Coverage Δ
src/diceBot/ArsMagica.rb	93.82% <100.00%> (+18.55%)	⬆️
src/diceBot/YearZeroEngine.rb	97.22% <0.00%> (ø)
src/dice/add_dice/node.rb	99.14% <0.00%> (ø)
src/test/add_dice_parser_test.rb	100.00% <0.00%> (ø)
src/dice/add_dice/parser.rb	93.93% <0.00%> (ø)
src/dice/add_dice/randomizer.rb	88.52% <0.00%> (ø)
src/dice/AddDice.rb	90.69% <0.00%> (+0.35%)	⬆️
src/diceBot/DiceBot.rb	95.10% <0.00%> (+1.09%)	⬆️
src/bcdiceCore.rb	72.13% <0.00%> (+1.21%)	⬆️
src/diceBot/CthulhuTech.rb	100.00% <0.00%> (+1.40%)	⬆️
... and 2 more

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[ochaochaocha3]

LGTM!