fix: remove labeltool console script whose module was never committed

pyproject.toml

@@ -138,7 +138,6 @@ imtool = "machinevisiontoolbox.bin.imtool:main"
 tagtool = "machinevisiontoolbox.bin.tagtool:main"
 ocrtool = "machinevisiontoolbox.bin.ocrtool:main"
 bagtool = "machinevisiontoolbox.bin.bagtool:main"
-labeltool = "machinevisiontoolbox.bin.labeltool:main"
 
 [build-system]
 requires = ["hatchling"]

tests/test_entry_points.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+
+import importlib.util
+import re
+import unittest
+from pathlib import Path
+
+PYPROJECT = Path(__file__).resolve().parent.parent / "pyproject.toml"
+
+
+def console_scripts(text: str) -> list[tuple[str, str, str]]:
+    """Parse ``[project.scripts]`` out of pyproject.toml text.
+
+    :param text: contents of a pyproject.toml file
+    :return: list of (command name, module, function) tuples
+
+    A regex is used rather than ``tomllib`` because the latter is only in the
+    standard library from Python 3.11 and this package supports 3.10.
+    """
+    match = re.search(r"^\[project\.scripts\]\n(.*?)(?=^\[|\Z)", text, re.S | re.M)
+    if match is None:
+        return []
+    return re.findall(r'^([\w-]+)\s*=\s*"([\w.]+):(\w+)"', match.group(1), re.M)
+
+
+def missing_modules(text: str) -> list[str]:
+    """Return the commands in ``[project.scripts]`` whose module cannot be found."""
+    return [
+        name
+        for name, module, _ in console_scripts(text)
+        if importlib.util.find_spec(module) is None
+    ]
+
+
+class TestEntryPoints(unittest.TestCase):
+    def test_console_scripts_exist(self):
+        """Every console script declared in pyproject.toml must have a module
+        behind it -- regression test for ``labeltool`` being declared (and so
+        installed by pip) in 2.4.0 while bin/labeltool.py was never committed,
+        which made the command fail with ModuleNotFoundError"""
+        scripts = console_scripts(PYPROJECT.read_text())
+        self.assertGreater(len(scripts), 0, "no console scripts found; parser broken?")
+        self.assertEqual(missing_modules(PYPROJECT.read_text()), [])
+
+    def test_detects_missing_module(self):
+        """The check itself must flag a script whose module does not exist"""
+        text = (
+            "[project.scripts]\n"
+            'good = "machinevisiontoolbox.bin.imtool:main"\n'
+            'bad = "machinevisiontoolbox.bin.no_such_tool:main"\n'
+            "\n[build-system]\n"
+        )
+        self.assertEqual(missing_modules(text), ["bad"])
+
+
+if __name__ == "__main__":
+    unittest.main()