diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 3ef28f9..560ded1 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -18,11 +18,16 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: "3.10"
+      - name: Install Protoc
+        uses: arduino/setup-protoc@v3
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip wheel setuptools
           pip install pytest hatch versioningit
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+      - name: Build protobuf
+        run: |
+          python ./build_protobuf.py
       - name: Build dist
         run: |
           hatch build
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e6fa664..c5774fc 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -19,11 +19,16 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: "3.10"
+      - name: Install Protoc
+        uses: arduino/setup-protoc@v3
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip wheel setuptools
-          pip install pytest pytest-cov
+          pip install pytest
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+      - name: Build protobuf
+        run: |
+          python ./build_protobuf.py
       - name: Test with pytest
         run: |
-          pytest --cov=src ./tests/
+          pytest ./tests/
diff --git a/build_protobuf.py b/build_protobuf.py
index f5ca8db..25a6016 100644
--- a/build_protobuf.py
+++ b/build_protobuf.py
@@ -1,7 +1,7 @@
 import os
 from pathlib import Path
 
-PROJECT_ROOT = Path(__file__).parent
+PROJECT_ROOT = Path(__file__).parent.absolute()
 
 PROTOC_PATH = "protoc"
 PROTO_DIR = PROJECT_ROOT.joinpath("proto")
@@ -12,11 +12,16 @@
         print("protoc not found")
         exit(1)
 
-    old_files = [i for i in os.listdir(PYTHON_OUTPUT_DIR) if i.endswith(("_pb2.py", "_pb2.pyi"))]
-    if len(old_files) > 0:
-        print("Removing old protobuf files")
-        for file in old_files:
-            os.remove(PYTHON_OUTPUT_DIR.joinpath(file))
+    if PYTHON_OUTPUT_DIR.exists():
+        old_files = [i for i in os.listdir(PYTHON_OUTPUT_DIR) if i.endswith(("_pb2.py", "_pb2.pyi"))]
+        if len(old_files) > 0:
+            print("Removing old protobuf files")
+            for file in old_files:
+                os.remove(PYTHON_OUTPUT_DIR.joinpath(file))
+    else:
+        print("Creating proto package")
+        PYTHON_OUTPUT_DIR.mkdir()
+        PYTHON_OUTPUT_DIR.joinpath("__init__.py").touch()
 
     print("Creating protobuf files")
     os.system(" ".join([
@@ -24,5 +29,5 @@
         f"--proto_path=\"{PROTO_DIR}\"",
         f"--pyi_out=\"{PYTHON_OUTPUT_DIR}\"",
         f"--python_out=\"{PYTHON_OUTPUT_DIR}\"",
-        f"\"{PROTO_DIR}/*\""
+        f"\"{PROTO_DIR.joinpath('*')}\""
     ]))
diff --git a/src/xiaomi_ndef/nfc.py b/src/xiaomi_ndef/nfc.py
index 87b5578..a3ef019 100644
--- a/src/xiaomi_ndef/nfc.py
+++ b/src/xiaomi_ndef/nfc.py
@@ -43,7 +43,7 @@ def decode(self, data: bytes) -> NfcTagAppData:
         return NfcTagAppData.decode(BytesIO(data))
 
     def __str__(self) -> str:
-        return "V1"
+        return self.__repr__()
 
     def __repr__(self) -> str:
         return "V1"
@@ -57,7 +57,7 @@ def decode(self, data: bytes) -> NfcTagAppData:
         return NfcTagAppData.decode(BytesIO(data))
 
     def __str__(self) -> str:
-        return "V2"
+        return self.__repr__()
 
     def __repr__(self) -> str:
         return "V2"
@@ -71,7 +71,7 @@ def decode(self, data: bytes) -> HandoffAppData:
         return HandoffAppData.decode(BytesIO(data))
 
     def __str__(self) -> str:
-        return "Handoff"
+        return self.__repr__()
 
     def __repr__(self) -> str:
         return "Handoff"
diff --git a/tests/test_xiaomi_ndef.py b/tests/test_xiaomi_ndef.py
index 00e4a7a..bbd19ea 100644
--- a/tests/test_xiaomi_ndef.py
+++ b/tests/test_xiaomi_ndef.py
@@ -110,16 +110,19 @@ def test_v1_protocol(self) -> None:
         payload = self._test_protocol(nfc.V1NfcProtocol, self._TEST_PAYLOAD_V1_BYTES)
         self.assertEqual(self._TEST_PAYLOAD_V1_BYTES, MiConnectData.from_nfc_payload(payload).to_bytes())
         self.assertEqual(self._TEST_PAYLOAD_V1.encode(), payload.appData.encode())
+        self.assertEqual(len(self._TEST_PAYLOAD_V1.encode()), payload.appData.size())
 
     def test_v2_protocol(self) -> None:
         payload = self._test_protocol(nfc.V2NfcProtocol, self._TEST_PAYLOAD_V2_BYTES)
         self.assertEqual(self._TEST_PAYLOAD_V2_BYTES, MiConnectData.from_nfc_payload(payload).to_bytes())
         self.assertEqual(self._TEST_PAYLOAD_V2.encode(), payload.appData.encode())
+        self.assertEqual(len(self._TEST_PAYLOAD_V2.encode()), payload.appData.size())
 
     def test_handoff_protocol(self) -> None:
         payload = self._test_protocol(nfc.HandoffNfcProtocol, self._TEST_PAYLOAD_HANDOFF_BYTES)
         self.assertEqual(self._TEST_PAYLOAD_HANDOFF_BYTES, MiConnectData.from_nfc_payload(payload).to_bytes())
         self.assertEqual(self._TEST_PAYLOAD_HANDOFF.encode(), payload.appData.encode())
+        self.assertEqual(len(self._TEST_PAYLOAD_HANDOFF.encode()), payload.appData.size())
 
 
 if __name__ == "__main__":