I want to test a few functions that are included in my main package, but my tests don't appear to be able to access those functions.
My sample main.go file looks like:
package main import ( "log" ) func main() { log.Printf(foo()) } func foo() string { return "Foo" }
and my main_test.go file looks like:
package main import ( "testing" ) func Foo(t testing.T) { t.Error(foo()) }
when I run go test main_test.go
I get
# command-line-arguments .\main_test.go:8: undefined: foo FAIL command-line-arguments [build failed]
As I understand, even if I moved the test file elsewhere and tried importing from the main.go file, I couldn't import it, since it's package main
.
What is the correct way of structuring such tests? Should I just remove everything from the main
package asides a simple main function to run everything and then test the functions in their own package, or is there a way for me to call those functions from the main file during testing?
when you specify files on the command line, you have to specify all of them
Here's my run:
$ ls main.go main_test.go $ go test *.go ok command-line-arguments 0.003s
note, in my version, I ran with both main.go and main_test.go on the command line
Also, your _test file is not quite right, you need your test function to be called TestXXX and take a pointer to testing.T
Here's the modified verison:
package main import ( "testing" ) func TestFoo(t *testing.T) { t.Error(foo()) }
and the modified output:
$ go test *.go --- FAIL: TestFoo (0.00s) main_test.go:8: Foo FAIL FAIL command-line-arguments 0.003s
Unit tests only go so far. At some point you have to actually run the program. Then you test that it works with real input, from real sources, producing real output to real destinations. For real.
If you want to unit test a thing move it out of main().
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