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diff --git a/assert/assert.go b/assert/assert.go
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+++ b/assert/assert.go
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+// SPDX-FileCopyrightText: 2026 Stefan Majewsky <majewsky@gmx.net>
+// SPDX-License-Identifier: Apache-2.0
+
+// Package assert contains assertions for use in unit tests.
+// Each assertion in this package returns a bool to indicate whether the check succeeded, and logs a t.Error() when the check does not succeed.
+package assert
+
+import (
+	"context"
+	"io"
+	"testing"
+)
+
+// TestingTB contains all the public functions of [testing.TB] (as of Go 1.26).
+// Functions in this package use this type instead of [testing.TB] because the capture device used by package testcapture cannot implement [testing.TB]: It contains methods that are private to the standard library.
+type TestingTB interface {
+	ArtifactDir() string
+	Attr(key, value string)
+	Chdir(dir string)
+	Cleanup(func())
+	Context() context.Context
+	Error(args ...any)
+	Errorf(format string, args ...any)
+	Fail()
+	Failed() bool
+	FailNow()
+	Fatal(args ...any)
+	Fatalf(format string, args ...any)
+	Helper()
+	Log(args ...any)
+	Logf(format string, args ...any)
+	Name() string
+	Output() io.Writer
+	Setenv(key, value string)
+	Skip(args ...any)
+	Skipf(format string, args ...any)
+	SkipNow()
+	Skipped() bool
+	TempDir() string
+}
+
+var _ TestingTB = testing.TB(nil)