1 files changed, 34 insertions, 0 deletions
diff --git a/gotp_test.go b/gotp_test.go
new file mode 100644
index 0000000..7743867
--- /dev/null
+++ b/gotp_test.go
@@ -0,0 +1,34 @@
+// SPDX-FileCopyrightText: 2024 Shulhan <ms@kilabit.info>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package gotp
+
+import (
+	"crypto/rand"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/shuLhan/share/lib/test/mock"
+)
+
+// Mock the termrw for reading passphrase.
+var mockTermrw = &mock.ReadWriter{}
+
+// mockRandReader mock the reader for crypto [rand.Reader] which is used to
+// provides predictable result in [libcrypto.EncryptOaep].
+var mockRandReader = mock.NewRandReader([]byte(`gotptest`))
+
+func TestMain(m *testing.M) {
+	termrw = mockTermrw
+
+	// Overwrite the random reader to provide predictable result.
+	rand.Reader = mockRandReader
+
+	// Overwrite current time for predictable OTP.
+	timeNow = func() time.Time {
+		return time.Date(2024, time.January, 30, 00, 03, 00, 00, time.UTC)
+	}
+
+	os.Exit(m.Run())
+}