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eventually.go
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eventually.go
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package testutil
import (
"context"
"fmt"
"testing"
"time"
"github.com/stretchr/testify/assert"
)
// Eventually is like require.Eventually except it allows passing
// a context into the condition. It is safe to use with `require.*`.
//
// If ctx times out, the test will fail, but not immediately.
// It is the caller's responsibility to exit early if required.
//
// It is the caller's responsibility to ensure that ctx has a
// deadline or timeout set. Eventually will panic if this is not
// the case in order to avoid potentially waiting forever.
//
// condition is not run in a goroutine; use the provided
// context argument for cancellation if required.
func Eventually(ctx context.Context, t testing.TB, condition func(ctx context.Context) (done bool), tick time.Duration, msgAndArgs ...interface{}) (done bool) {
t.Helper()
if _, ok := ctx.Deadline(); !ok {
panic("developer error: must set deadline or timeout on ctx")
}
msg := "Eventually timed out"
if len(msgAndArgs) > 0 {
m, ok := msgAndArgs[0].(string)
if !ok {
panic("developer error: first argument of msgAndArgs must be a string")
}
msg = fmt.Sprintf(m, msgAndArgs[1:]...)
}
ticker := time.NewTicker(tick)
defer ticker.Stop()
for tick := ticker.C; ; {
select {
case <-ctx.Done():
assert.NoError(t, ctx.Err(), msg)
return false
case <-tick:
if !assert.NoError(t, ctx.Err(), msg) {
return false
}
if condition(ctx) {
return true
}
}
}
}