diff --git a/mock_test.go b/mock_test.go
new file mode 100644
index 0000000..4e44486
--- /dev/null
+++ b/mock_test.go
@@ -0,0 +1,50 @@
+package eventually_test
+
+import (
+	"fmt"
+	"testing"
+)
+
+type test struct {
+	*testing.T
+	logs   []string
+	failed bool
+	halted bool
+}
+
+func (t *test) Fail() {
+	t.failed = true
+}
+
+func (t *test) FailNow() {
+	t.failed = true
+	t.halted = true
+}
+
+func (t *test) Fatal(args ...interface{}) {
+	t.Log(args...)
+	t.FailNow()
+}
+
+func (t *test) Fatalf(format string, args ...interface{}) {
+	t.Logf(format, args...)
+	t.FailNow()
+}
+
+func (t *test) Error(args ...interface{}) {
+	t.Log(args...)
+	t.Fail()
+}
+
+func (t *test) Errorf(format string, args ...interface{}) {
+	t.Logf(format, args...)
+	t.Fail()
+}
+
+func (t *test) Log(args ...any) {
+	t.logs = append(t.logs, fmt.Sprintln(args...))
+}
+
+func (t *test) Logf(format string, args ...any) {
+	t.logs = append(t.logs, fmt.Sprintf(format, args...))
+}