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failer.go
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failer.go
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// -----------------------------------------------------------------------------
// asserts for more convinient testing - failer providing interfaces for positive
// and negative testing
//
// Copyright (C) 2024 Frank Mueller / Oldenburg / Germany / World
// -----------------------------------------------------------------------------
package asserts // import "tideland.dev/go/asserts"
import (
"testing"
)
// Behavior is used to define the behavior for breaking a test.
type Behavior bool
const (
FAIL Behavior = true
CONTINUE Behavior = false
)
// Tester is the interface for the testing.TB interface. It helps to count
// failures without breaking the test.
type Tester interface {
testing.TB
}
// tester implements the Tester interface and overwrites the Fail and FailNow
// methods to count the number of failures.
type tester struct {
testing.TB
fail bool
failed int
}
// NewTester creates a new tester. The behavior defines if the test should
// break on the first failure.
func NewTester(tb testing.TB, behavior Behavior) Tester {
return &tester{
TB: tb,
fail: bool(behavior),
}
}
// Error overwrites the testing.TB method to count the number of failures if
// the behavior is set to CONTINUE. Otherwise it fails the test.
func (t *tester) Error(args ...any) {
t.failed++
if t.fail {
t.TB.Error(args...)
}
}
// Errorf overwrites the testing.TB method to count the number of failures if
// the behavior is set to CONTINUE. Otherwise it fails the test.
func (t *tester) Errorf(format string, args ...any) {
t.failed++
if t.fail {
t.TB.Errorf(format, args...)
}
}
// Fail overwrites the testing.TB method to count the number of failures if
// the behavior is set to CONTINUE. Otherwise it fails the test.
func (t *tester) Fail() {
t.failed++
if t.fail {
t.TB.Fail()
}
}
// FailNow overwrites the testing.TB method to count the number of failures if
// the behavior is set to CONTINUE. Otherwise it fails the test.
func (t *tester) FailNow() {
t.failed++
if t.fail {
t.TB.FailNow()
}
}
// Failures checks the number of failures and fails the test if it is not
// the expected one.
func Failures(t Tester, expected int) {
tt, ok := t.(*tester)
if !ok {
t.Fail()
return
}
if tt.failed != expected {
t.Errorf("expected %d failures, but got %d", expected, tt.failed)
}
}
// -----------------------------------------------------------------------------
// end of file
// -----------------------------------------------------------------------------