如何在ruby中设置类作用域常量？

Question

超级初学者容易点红宝石问题。我试图通过编程Project Euler问题来学习一些红宝石。所以我有一个测试

class ProjectEuler_tests < Test::Unit::TestCase 
    @solution = 123456 # Not the answer so as not to be a spoiler 
    def test_problem_1 
    assert_equal(@solution, ProjectEuler1.new.solve) 
    end 
end 

但是这不起作用，@测试运行时@解决方案为零。在课堂范围内分配它的正确方法是什么？

Answer 1

Class constants红宝石以大写字符：

class ProjectEuler_tests < Test::Unit::TestCase 
    SOLUTION = 123456 # Not the answer so as not to be a spoiler 
    def test_problem_1 
    assert_equal(SOLUTION, ProjectEuler1.new.solve) 
    end 
end