How to run test cases in a specified file?

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There are two ways. The easy one is to use the -run flag and provide a pattern matching names of the tests you want to run.

Example:

$ go test packageName -run NameOfTest

See the docs for more info.

Note that the -run flag may also run other tests if they contain the string NameOfTest, as the -run flag matches a regexp.

So to ensure that only a test named exactly ‘NameOfTest’ is run,
one has to use the regexp ^NameOfTest$:

$ go test -run "^NameOfTest$"

The other way is to name the specific file, containing the tests you want to run:

$ go test foo_test.go

But there’s a catch. This works well if:

  • foo.go is in package foo.
  • foo_test.go is in package foo_test and imports ‘foo’.

If foo_test.go and foo.go are the same package (a common case) then you must name all other files required to build foo_test. In this example it would be:

$ go test foo_test.go foo.go

I’d recommend to use the -run pattern. Or, where/when possible, always run all package tests.

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