get the automated generation of test cases working again

HOWTO.md

@@ -87,7 +87,9 @@ python missing.py --host [HOST] --port [PORT]
 
 ### New Messages
 The `json2test` script can be used to automatically generate tests for newly
-defined messages.
+defined messages. The json2test script uses [uv](https://docs.astral.sh/uv/) to
+manage its dependencies, which can be installed following the instructions on that
+website
 
 To use `json2test` a JSON file should be hand written with example contents of a
 message. For example, to generate tests for the `MSG_HEARTBEAT` message (which
@@ -105,13 +107,17 @@ form:
 And then generate a test for using `json2test` with:
 
 ```shell
-PYTHONPATH="python/" python generator/json2test.py --input heartbeat.json --output spec/tests/yaml/swiftnav/sbp/system/test_MsgHeartbeat.yaml
+uv run json2test.py --input heartbeat.json --output spec/tests/yaml/swiftnav/sbp/system/test_MsgHeartbeat.yaml
 ```
 
+*NOTE* because the json2test file imports the local version of sbp & the build
+system of it all is a little slapdash, this command will ONLY work if called from
+inside of `libsbp/generator/` directory.
+
 Usage for `json2test`
 
 ```shell
-python json2test --input [PATH_TO_JSON_IN] --output [PATH_TO_YAML_OUT]
+uv run json2test --input [PATH_TO_JSON_IN] --output [PATH_TO_YAML_OUT]
 ```
 
 * The `msg_type` can also be provided through a CLI parameter, with `--msg-id

generator/json2test.py

@@ -1,4 +1,4 @@
-# Copyright (C) 2022 Swift Navigation Inc.
+# Copyright (C) 2024 Swift Navigation Inc.
 # Contact: https://support.swiftnav.com
 #
 # This source is subject to the license found in the file 'LICENSE' which must
@@ -7,6 +7,17 @@
 # THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
 # EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
 # WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
+#
+# /// script
+# requires-python = ">=3.12"
+# dependencies = [
+#     "jinja2 ~= 3.1",
+#     "pytest ~= 8.3",
+#     "pyyaml ~= 6.0",
+#     "sbp @ file:///${PROJECT_ROOT}/../python",
+# ]
+# ///
+
 """
 Generate test case from json input
 """

generator/sbpg/test_structs.py

@@ -99,7 +99,7 @@ def __init__(self, raw_packet, msg_type, raw_json, msg, sbp, test_msg_data=None)
     self.payload = base64.standard_b64decode(self.sbp['payload'])
     self.payload_as_byte_array = list(bytearray(self.payload))
     self.payload_len_for_encoding_buf = len(self.payload) if len(self.payload) > 0 else 1
-    msg_name = msg['name']
+    msg_name = msg.__class__.__name__
     for i in range(0, len(ACRONYMS)):
         msg_name = re.sub(ACRONYMS[i], LOWER_ACRONYMS[i], msg_name)
     self.enum_value = "Sbp" + msg_name