Function TestTestLoggerErrorOutput

zaptest/logger_test.go:116–139

(t *testing.T)

}

func TestTestLoggerErrorOutput(t *testing.T) {
	// This test verifies that the test logger logs internal messages to the
	// testing.T and marks the test as failed.

	ts := newTestLogSpy(t)
	defer ts.AssertFailed()

	log := NewLogger(ts)

	// Replace with a core that fails.
	log = log.WithOptions(zap.WrapCore(func(zapcore.Core) zapcore.Core {
		return zapcore.NewCore(
			zapcore.NewConsoleEncoder(zap.NewDevelopmentEncoderConfig()),
			zapcore.Lock(zapcore.AddSync(ztest.FailWriter{})),
			zapcore.DebugLevel,
		)
	}))

	log.Info("foo") // this fails

	if assert.Len(t, ts.Messages, 1, "expected a log message") {
		assert.Regexp(t, `write error: failed`, ts.Messages[0])
	}
}

// testLogSpy is a testing.TB that captures logged messages.
type testLogSpy struct {