attest/errors_test.go at main · cboone/attest · GitHub

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package attest_test

import (
	"errors"
	"fmt"
	"strings"
	"testing"

	"github.com/cboone/attest"
)

func TestNoError(t *testing.T) {
	t.Run("nil error passes", func(t *testing.T) {
		mt := newMockT(t)
		attest.NoError(mt, nil)
		if mt.failed {
			t.Error("NoError(nil) should not fail")
		}
	})

	t.Run("non-nil error fails", func(t *testing.T) {
		mt := newMockT(t)
		attest.NoError(mt, errors.New("something went wrong"))
		if !mt.failed {
			t.Error("NoError(err) should fail")
		}
		if len(mt.messages) > 0 && !strings.Contains(mt.messages[0], "something went wrong") {
			t.Errorf("expected error message in output, got: %s", mt.messages[0])
		}
	})
}

func TestIsError(t *testing.T) {
	t.Run("non-nil error passes", func(t *testing.T) {
		mt := newMockT(t)
		attest.IsError(mt, errors.New("err"))
		if mt.failed {
			t.Error("IsError(err) should not fail")
		}
	})

	t.Run("nil error fails", func(t *testing.T) {
		mt := newMockT(t)
		attest.IsError(mt, nil)
		if !mt.failed {
			t.Error("IsError(nil) should fail")
		}
	})
}

func TestErrorIs(t *testing.T) {
	var errSentinel = errors.New("sentinel")

	t.Run("wrapped error matches sentinel", func(t *testing.T) {
		mt := newMockT(t)
		wrapped := fmt.Errorf("wrap: %w", errSentinel)
		attest.ErrorIs(mt, wrapped, errSentinel)
		if mt.failed {
			t.Error("ErrorIs should pass for wrapped sentinel")
		}
	})

	t.Run("different sentinel fails", func(t *testing.T) {
		mt := newMockT(t)
		attest.ErrorIs(mt, errors.New("other"), errSentinel)
		if !mt.failed {
			t.Error("ErrorIs should fail for non-matching sentinel")
		}
	})

	t.Run("nil error fails", func(t *testing.T) {
		mt := newMockT(t)
		attest.ErrorIs(mt, nil, errSentinel)
		if !mt.failed {
			t.Error("ErrorIs should fail for nil error")
		}
		if len(mt.messages) > 0 && !strings.Contains(mt.messages[0], "<nil>") {
			t.Errorf("expected '<nil>' in message for nil error, got: %s", mt.messages[0])
		}
	})
}

type validationError struct {
	Field   string
	Message string
}

func (e *validationError) Error() string {
	return fmt.Sprintf("validation error on %s: %s", e.Field, e.Message)
}

func TestErrorAs(t *testing.T) {
	t.Run("custom error type extracted", func(t *testing.T) {
		mt := newMockT(t)
		err := fmt.Errorf("wrap: %w", &validationError{Field: "name", Message: "required"})
		var target *validationError
		attest.ErrorAs(mt, err, &target)
		if mt.failed {
			t.Error("ErrorAs should pass for matching error type")
		}
		if target != nil && target.Field != "name" {
			t.Errorf("expected Field=name, got %s", target.Field)
		}
	})

	t.Run("wrong type fails", func(t *testing.T) {
		mt := newMockT(t)
		err := errors.New("plain error")
		var target *validationError
		attest.ErrorAs(mt, err, &target)
		if !mt.failed {
			t.Error("ErrorAs should fail for non-matching error type")
		}
	})

	t.Run("nil error fails", func(t *testing.T) {
		mt := newMockT(t)
		var target *validationError
		attest.ErrorAs(mt, nil, &target)
		if !mt.failed {
			t.Error("ErrorAs should fail for nil error")
		}
	})
}

func TestErrorContains(t *testing.T) {
	t.Run("substring present passes", func(t *testing.T) {
		mt := newMockT(t)
		attest.ErrorContains(mt, errors.New("connection refused"), "refused")
		if mt.failed {
			t.Error("ErrorContains should pass when substring is present")
		}
	})

	t.Run("substring absent fails", func(t *testing.T) {
		mt := newMockT(t)
		attest.ErrorContains(mt, errors.New("connection refused"), "timeout")
		if !mt.failed {
			t.Error("ErrorContains should fail when substring is absent")
		}
	})

	t.Run("nil error fails", func(t *testing.T) {
		mt := newMockT(t)
		attest.ErrorContains(mt, nil, "anything")
		if !mt.failed {
			t.Error("ErrorContains should fail for nil error")
		}
	})
}