diff --git a/requirements.txt b/requirements.txt
index 301aafc..d6299dc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ pillow
 pyzbar
 qrcode
 protobuf
+pytest
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diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_gauth_reencoder.py b/tests/test_gauth_reencoder.py
new file mode 100644
index 0000000..b1a78ff
--- /dev/null
+++ b/tests/test_gauth_reencoder.py
@@ -0,0 +1,28 @@
+import pytest
+from gauth_reencoder import decode_totp
+from gauth_reencoder import generate_new_url
+
+@pytest.mark.parametrize("url, account, issuer, secret, algorithm, digits", [
+    ("otpauth://totp/DEF?algorithm=&digits=&issuer=ABC&secret=jidowio390u20", "DEF", "ABC", "jidowio390u20", "", ""),
+    ("otpauth://totp/Label?secret=jidowio390u20&issuer=Issuer", "Label", "Issuer", "jidowio390u20", "", ""),
+])
+def test_decode_totp(url: str, account: str, issuer: str, secret: str, algorithm: str, digits: str):
+    decoded = decode_totp(url)
+    assert decoded["account"] == account
+    assert decoded["issuer"] == issuer
+    assert decoded["secret"] == secret
+    assert decoded["algorithm"] == algorithm
+    assert decoded["digits"] == digits
+
+@pytest.mark.parametrize("url, account, issuer, secret, algorithm, digits", [
+    ("otpauth://totp/DEF?algorithm=&digits=&issuer=ABC&secret=jidowio390u20", "DEF", "ABC", "jidowio390u20", "", ""),
+])
+def test_generate_new_url(url: str, account: str, issuer: str, secret: str, algorithm: str, digits: str):
+    decoded = dict()
+    decoded["account"] = account
+    decoded["issuer"] = issuer
+    decoded["secret"] = secret
+    decoded["algorithm"] = algorithm
+    decoded["digits"] = digits
+    new_url = generate_new_url(decoded)
+    assert new_url == url
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