I am using the excellent testthat package in R. My issue is that I cannot see any output from the message() function in the code being tested when using test_file. for example, say I have following code in a file called test_message.R
f <- function() {
message ("Message: Hello world")
cat ("Cat: Hello world\n")
return (1)
}
test_that ("message shows up", {
expect_equal(f(), 1)
})
I run test_file as follows and get the output below
> test_file("test_message.R")
Cat: Hello world
.
So I am not seeing the text from message().
However, when I run the code on its own I do see it:
> f()
Message: Hello world
Cat: Hello world
[1] 1
I know that by default, message() writes to stderr and cat writes to stdout and I'm guessing that test_file "intercepts" stderr to test for the text in warnings and errors. Is there any way I can configure things so I see message() text on the console?
You can't do this, at least not without modifying the source code of testthat. This is the part that runs the code of the test: https://github.com/hadley/testthat/blob/0af22cfc7c7f6b13b02537f0d37d96d72d8a98b7/R/test-that.r#L65 If you remove the suppressMessages from the test_code function, then the messages will be displayed.
Btw. testthat does not capture standard output or error AFAIK, so if you write to it using cat or some other way, that will also displayed.
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