为什么我的Ruby代码中出现“错误的参数数量（0代表2）”异常？

Question

我想通过从“测试驱动开发：通过示例”编写Kent Beck的xUnit Python示例来改进我的Ruby。我有相当远的距离，但现在当我跑步的时候，我得到了下面的错误，我不理睬。

C:\Documents and Settings\aharmel\My Documents\My Workspace\TDD_Book\TDDBook_xUnit_RubyVersion\lib\main.rb:21:in `test_running': wrong number of arguments (0 for 2) (ArgumentError) 
    from C:\Documents and Settings\aharmel\My Documents\My Workspace\TDD_Book\TDDBook_xUnit_RubyVersion\lib\main.rb:21:in `run' 
    from C:\Documents and Settings\aharmel\My Documents\My Workspace\TDD_Book\TDDBook_xUnit_RubyVersion\lib\main.rb:85 

我的代码如下所示：

class TestCase 
    def initialize(name) 
    puts "1. inside TestCase.initialise: @name: #{name}" 
    @name = name 
    end 
    def set_up 
    # No implementation (but present to be overridden in WasRun) 
    end 
    def run 
    self.set_up 
    self.send @name # <<<<<<<<<<<<<<<<<<<<<<<<<= ERROR HERE!!!!!! 
    end 
end 

class WasRun < TestCase 
    attr_accessor :wasRun 
    attr_accessor :wasSetUp 

    def initialize(name) 
    super(name) 
    end 
    def set_up 
    @wasRun = false 
    @wasSetUp = true 
    end 
    def test_method 
    @wasRun = true 
    end 
end 

class TestCaseTest < TestCase 
    def set_up 
    @test = WasRun.new("test_method") 
    end 
    def test_running 
    @test.run 
    puts "test was run? (true expected): #{test.wasRun}" 
    end 
    def test_set_up 
    @test.run 
    puts "test was set up? (true expected): #{test.wasSetUp}" 
    end 
end 

TestCaseTest.new("test_running").run 

任何人都可以指出我的明显错误？

Answer 1

这是你的打印语句：

puts "test was run? (true expected): #{test.wasRun}" 

应该

puts "test was run? (true expected): #{@test.wasRun}" 

没有 '@' 你调用内核＃测试，预计2个变量。

Answer 2

有一点需要注意的是，send方法需要一个标识方法名称的符号，但是您正尝试使用一个实例变量。

Object.send documentation

而且，不应线是这样的：

puts "test was run? (true expected): #{test.wasRun}" 

是：

puts "test was run? (true expected): #{@test.wasRun}" 

？