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I am learning how to use the https://github.com/rogpeppe/go-internal testscript module to test the cli program.
When I use this line in the .txtar
file:
stderr /No help topic/gm
...The actual error output is:
No help topic for 'totalfoobar'
I get the error usage: stderr [-count=N] 'pattern'
.
I've looked at the documentation here and to be honest, it's hard to understand. I don't see any explanation of what -count=N
means.
I tried all variations of the following:
stderr -count=1 No help topic for 'totalfoobar' stderr No help topic for 'totalfoobar' stderr *No help topic*
No matter what the string is, the assertion still fails with the same error.
Q: How can I get a substring of the total stderr/stdout output for more flexible testing?
Use single quotes to quote the pattern:
// parse parses a single line as a list of space-separated arguments // subject to environment variable expansion (but not resplitting). // Single quotes around text disable splitting and expansion. // To embed a single quote, double it: 'Don”t communicate by sharing memory.' func (ts *TestScript) parse(line string) []string
The results are passed as args
arguments to scriptMatch at the end. The implementation of scriptMatch indicates that it requires only 1
arguments in addition to the optional -count flag. If No help topic
is not quoted, it will be parsed into 3 parameters, which is not as expected:
extraUsage := "" want := 1 // [code truncated] if len(args) != want { ts.Fatalf("usage: %s [-count=N] 'pattern'%s", name, extraUsage) }
By the way, the mode it compiles in is as follows:
re, err := regexp.Compile(`(?m)` + pattern)
Remember that you should write regular expressions using Go flavor syntax.
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