Are you running test run tests at the same time?

Question

At startup, go testit launches your files ending in _test.go, running functions starting in the format TestXxx, and use the module (* t testing.T). I was wondering if each function in the file was running at the _test.gosame time, or if it finally performed each function separately? Does he create a routine for each of them? If he creates a routine for each of them, can I somehow control the go routines? Is it possible to someday do something like golibrary.GoRoutines()and get an instance for each of them and control them somehow or something like that?

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Note. This question assumes that you are using the testing platform that comes with go (testing).

Answer 1

Yes , tests run as goroutines and thus run simultaneously .

However, tests do not run in parallel by default , as pointed out by @jacobsa . To enable parallel execution, you need to call t.Parallel()in the test case and set GOMAXPROCSaccordingly or put -parallel N.

, . , . :

import "sync/atomic"

var ports [...]uint64 = {10, 5, 55}
var portIndex uint32

func nextPort() uint32 {
    return atomic.AddUint32(&portIndex, 1)
}

Answer 2

, t.Parallel , -parallel.

Answer 3

(, ), , :

package foo_test

var forceSequential chan bool = make(chan bool, 1)

func Test1(t *testing.T) {
    forceSequential <- true
    // Your test here
    <- forceSequential
}

func Test2(t *testing.T) {
    forceSequential <- true
    // Your test here
    <- forceSequential
}

func Test3(t *testing.T) {
    forceSequential <- true
    // Your test here
    <- forceSequential
}

, , . :

package foo_test

var (
    chan1 bool = make(chan bool, 1)
    chan2 bool = make(chan bool, 1)
)

func Test1(t *testing.T) {
    // Your test here
    chan1 <- true
}

func Test2(t *testing.T) {
    <- chan1
    // Your test here
    chan2 <- true
}

func Test3(t *testing.T) {
    <- chan2
    // Your test here
}

But then again, does not do this . If your tests (and, accordingly, your code) depend on the global state for proper execution, you are doing something wrong . Fix it and you will not have problems with parallel tests.