为什么我得到一个错误的参数数量(0表示2)”我的Ruby代码中的异常?
-
02-07-2019 - |
题
我正试图通过从“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。我已经走得很远,但是现在我跑的时候出现了以下错误,我不会理解。
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
有人能指出我明显的错误吗?
解决方案
这是你的打印声明:
puts "test was run? (true expected): #{test.wasRun}"
应该是
puts "test was run? (true expected): #{@test.wasRun}"
没有'@'你正在调用Kernel#test,它需要2个变量。
其他提示
跳出来的一件事是 send
方法需要一个标识方法名称的符号,但是你试图使用一个实例变量。
此外,不应该这样的行:
puts "test was run? (true expected): #{test.wasRun}"
是:
puts "test was run? (true expected): #{@test.wasRun}"
不隶属于 StackOverflow