refactor: RSpecからMinitestへ移行してテストを高速化・簡素化

- RSpecは1つのCSVテストには過剰（オーバースペック）
- MinitestはRuby標準ライブラリで追加gem不要
- より高速な実行とシンプルな記述
- テスト内容を拡充（ヘッダー確認、空文字チェック、SSH鍵フォーマット検証）

追加したRakeタスク:
- rake test (rake t) - 全テスト実行
- rake test_csv - CSV検証のみ
- rake test_verbose - 詳細出力モード

パフォーマンス向上:
- 外部依存を削減
- 起動時間の短縮
- 学習コストの低減

Author: yasulab

Gemfile

@@ -3,7 +3,6 @@ git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 
 gem 'httpclient'
 gem 'rake'
-gem 'rspec'
 
 # Add bundled gems to fix errors/warnings
 gem 'csv'

Gemfile.lock

@@ -3,26 +3,12 @@ GEM
   specs:
     base64 (0.3.0)
     csv (3.3.4)
-    diff-lcs (1.6.2)
     dotenv (3.1.8)
     httpclient (2.9.0)
       mutex_m
     mutex_m (0.3.0)
     net-ssh (7.3.0)
     rake (13.2.1)
-    rspec (3.13.0)
-      rspec-core (~> 3.13.0)
-      rspec-expectations (~> 3.13.0)
-      rspec-mocks (~> 3.13.0)
-    rspec-core (3.13.3)
-      rspec-support (~> 3.13.0)
-    rspec-expectations (3.13.4)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.13.0)
-    rspec-mocks (3.13.4)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.13.0)
-    rspec-support (3.13.3)
 
 PLATFORMS
   ruby
@@ -34,7 +20,6 @@ DEPENDENCIES
   httpclient
   net-ssh
   rake
-  rspec
 
 BUNDLED WITH
    2.6.9

Rakefile

@@ -1,14 +1,35 @@
-require "rspec/core/rake_task"
+require 'rake/testtask'
 require 'fileutils'
 require 'json'
 require 'time'
 require 'net/http'
 require 'uri'
 require 'csv'
 
-RSpec::Core::RakeTask.new(:spec)
+# Minitestタスクの定義
+Rake::TestTask.new(:test) do |t|
+  t.libs << "test"
+  t.test_files = FileList['test/*_test.rb']
+  t.verbose = true
+end
+
+# 短縮エイリアス
+task :t => :test
+
+# テストの詳細情報を表示
+desc "Run all tests with detailed output"
+task :test_verbose do
+  ENV['TESTOPTS'] = '--verbose'
+  Rake::Task[:test].invoke
+end
+
+# CSV検証のみ実行
+desc "Validate CSV format only"
+task :test_csv do
+  ruby "test/csv_test.rb"
+end
 
-task :test => :spec
+task :default => :test
 
 # Rakeの高度な機能を活用した改善
 # - 依存関係の明確化

spec/csv_spec.rb

@@ -0,0 +1,57 @@
+require 'minitest/autorun'
+require 'csv'
+
+class CSVTest < Minitest::Test
+  INSTANCE_CSV = "servers.csv".freeze
+
+  def test_csv_has_required_headers
+    csv = CSV.read(INSTANCE_CSV, headers: true)
+    
+    # ヘッダーの存在確認
+    assert csv.headers.include?('name'), "CSV must have 'name' header"
+    assert csv.headers.include?('description'), "CSV must have 'description' header"
+    assert csv.headers.include?('pubkey'), "CSV must have 'pubkey' header"
+    assert csv.headers.include?('branch'), "CSV must have 'branch' header"
+  end
+
+  def test_csv_fields_are_not_nil
+    CSV.read(INSTANCE_CSV, headers: true).each_with_index do |line, index|
+      # 各行の必須フィールドが存在することを確認
+      refute_nil line['name'], "Row #{index + 1}: name must not be nil"
+      refute_nil line['description'], "Row #{index + 1}: description must not be nil"
+      refute_nil line['pubkey'], "Row #{index + 1}: pubkey must not be nil"
+      refute_nil line['branch'], "Row #{index + 1}: branch must not be nil"
+    end
+  end
+
+  def test_csv_fields_are_not_empty
+    CSV.read(INSTANCE_CSV, headers: true).each_with_index do |line, index|
+      # 各フィールドが空文字でないことを確認
+      refute_empty line['name'].to_s.strip, "Row #{index + 1}: name must not be empty"
+      refute_empty line['description'].to_s.strip, "Row #{index + 1}: description must not be empty"
+      refute_empty line['pubkey'].to_s.strip, "Row #{index + 1}: pubkey must not be empty"
+      refute_empty line['branch'].to_s.strip, "Row #{index + 1}: branch must not be empty"
+    end
+  end
+
+  def test_pubkey_format
+    CSV.read(INSTANCE_CSV, headers: true).each_with_index do |line, index|
+      pubkey = line['pubkey']
+      next if pubkey.nil? || pubkey.empty?
+      
+      # SSH公開鍵の基本的なフォーマットチェック
+      assert_match(/^(ssh-rsa|ssh-ed25519|ecdsa-sha2-nistp256)/, pubkey,
+                   "Row #{index + 1}: pubkey must be a valid SSH public key")
+    end
+  end
+
+  def test_branch_is_not_empty
+    CSV.read(INSTANCE_CSV, headers: true).each_with_index do |line, index|
+      branch = line['branch']
+      
+      # branchフィールドが空でないことを確認（各道場固有のブランチ名を許可）
+      refute_nil branch, "Row #{index + 1}: branch must not be nil"
+      refute_empty branch.to_s.strip, "Row #{index + 1}: branch must not be empty"
+    end
+  end
+end