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Testing os.Exit Scenarios in Go
When testing Go functions that invoke os.Exit(), a unique approach is required to prevent these exits from interfering with subsequent tests.
To address this, consider the following code:
func doomed() { os.Exit(1) }
How to Properly Test os.Exit Behavior Using Go Test
To test the exit behavior of this function, we can leverage a technique outlined by Andrew Gerrand, a core member of the Go team:
Example Test Code:
package main import ( "fmt" "os" "os/exec" "testing" ) func Crasher() { fmt.Println("Going down in flames!") os.Exit(1) } func TestCrasher(t *testing.T) { if os.Getenv("BE_CRASHER") == "1" { Crasher() return } cmd := exec.Command(os.Args[0], "-test.run=TestCrasher") cmd.Env = append(os.Environ(), "BE_CRASHER=1") err := cmd.Run() if e, ok := err.(*exec.ExitError); ok && !e.Success() { return } t.Fatalf("process ran with err %v, want exit status 1", err) }
By separating testing processes and using environment variables to control execution, you can effectively test os.Exit scenarios in your Go test suites without affecting other tests.
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