StringUtils.create_random_alpha_string の生成する文字の上限を廃止

bizside_test_app/test/lib/bizside/string_utils_test.rb

@@ -7,4 +7,21 @@ def test_rand_string
     assert s =~ /^(?=.*?[a-z])(?=.*?\d).*+$/iu
   end
 
+  def test_create_random_alpha_string_case_sensitive_true
+    s = StringUtils.create_random_alpha_string(10, true)
+    assert s =~ /\A[A-Za-z]{10}\z/
+  end
+
+  def test_create_random_alpha_string_case_sensitive_false
+    s = StringUtils.create_random_alpha_string(10, false)
+    assert s =~ /\A[a-z]{10}\z/
+  end
+
+  def test_create_random_alpha_string_more_than_26_chars
+    s = StringUtils.create_random_alpha_string(53, true)
+    assert s =~ /\A[A-Za-z]{53}\z/
+
+    s = StringUtils.create_random_alpha_string(27, false)
+    assert s =~ /\A[a-z]{27}\z/
+  end
 end

lib/bizside/string_utils.rb

@@ -7,7 +7,9 @@ class StringUtils
     def self.create_random_alpha_string length, case_sensitive = false
       chars = ('a'..'z').to_a
       chars += ('A'..'Z').to_a if case_sensitive
-      chars.sample(length).join
+      chars_length = chars.length
+
+      Array.new(length) { chars[rand(chars_length)] }.join
     end
 
     def self.create_random_string(number)