来自测试的函数Expect_that会出错 [英] function expect_that from testthat runs into error
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问题描述
有人可以帮我解释一下,如果在停止消息中添加[]
时expect_that
不起作用的原因,即f1
起作用但f2
无效.
Can anybody help me and explain why expect_that
doesn't work if []
is added to the stop message, i.e. f1
works but f2
doesn't.
library(testthat)
f1 <- function(x){
if( x >= 1 ){
stop("error 1")
}
}
expect_that(f1(x=1.4), throws_error("error 1"))
f2 <- function(x){
if( x >= 1 ){
stop("error [1]")
}
}
expect_that(f2(x=1.4), throws_error("error [1]"))
推荐答案
expect_that
正在寻找正则表达式来匹配错误,因此您需要对方括号进行转义,以便它们完全按字面解释而不是作为模式定义:
expect_that
is looking for a regular expression to match the error, so you need to escape the square-brackets so that they are interpreted literally rather than as a pattern definition:
expect_that(f2(x=1.4), throws_error("error \\[1\\]"))
似乎可以正常工作.
或者您可以指定fixed=TRUE
:
expect_that(f2(x=1.4), throws_error("error [1]", fixed = TRUE))
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