added tests for payload length validation in `transmit()`

tests/test_transmit.py

@@ -0,0 +1,64 @@
+import unittest.mock
+
+import pytest
+
+import cc1101.options
+
+
+def test_transmit_empty_payload(transceiver):
+    with unittest.mock.patch.object(
+        transceiver,
+        "get_packet_length_mode",
+        return_value=cc1101.options.PacketLengthMode.VARIABLE,
+    ), unittest.mock.patch.object(
+        transceiver, "get_packet_length_bytes", return_value=21
+    ):
+        with pytest.raises(ValueError, match=r"\bempty\b"):
+            transceiver.transmit([])
+
+
+@pytest.mark.parametrize("payload", (b"\0\x01\x02", [0, 127]))
+def test_transmit_first_null(transceiver, payload):
+    with unittest.mock.patch.object(
+        transceiver,
+        "get_packet_length_mode",
+        return_value=cc1101.options.PacketLengthMode.VARIABLE,
+    ), unittest.mock.patch.object(
+        transceiver, "get_packet_length_bytes", return_value=21
+    ):
+        with pytest.raises(ValueError, match=r"\bfirst byte\b.*\bmust not be null\b"):
+            transceiver.transmit(payload)
+
+
+@pytest.mark.parametrize(
+    ("max_packet_length", "payload"),
+    ((3, "\x04\x01\x02\x03"), (4, [7, 21, 42, 0, 0, 1, 2, 3])),
+)
+def test_transmit_exceeding_max_length(transceiver, max_packet_length, payload):
+    with unittest.mock.patch.object(
+        transceiver,
+        "get_packet_length_mode",
+        return_value=cc1101.options.PacketLengthMode.VARIABLE,
+    ), unittest.mock.patch.object(
+        transceiver, "get_packet_length_bytes", return_value=max_packet_length
+    ):
+        with pytest.raises(
+            ValueError, match=r"\bpayload exceeds maximum payload length\b"
+        ):
+            transceiver.transmit(payload)
+
+
+@pytest.mark.parametrize(
+    ("packet_length", "payload"),
+    ((3, "\x04\x01\x02\x03"), (4, [7, 21, 42, 0, 0, 1, 2, 3])),
+)
+def test_transmit_unexpected_payload_len(transceiver, packet_length, payload):
+    with unittest.mock.patch.object(
+        transceiver,
+        "get_packet_length_mode",
+        return_value=cc1101.options.PacketLengthMode.FIXED,
+    ), unittest.mock.patch.object(
+        transceiver, "get_packet_length_bytes", return_value=packet_length
+    ):
+        with pytest.raises(ValueError, match=r"\bpayload length\b"):
+            transceiver.transmit(payload)