new

tests/test_cli.py

@@ -0,0 +1,42 @@
+from __future__ import annotations
+
+import subprocess
+import sys
+import unittest
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+def _run(*args: str) -> subprocess.CompletedProcess[str]:
+    return subprocess.run(
+        [sys.executable, *args],
+        cwd=ROOT,
+        text=True,
+        capture_output=True,
+        check=False,
+    )
+
+
+class CliTests(unittest.TestCase):
+    def test_wrapper_help_works(self):
+        proc = _run("RFG_ADC_dataplotter.py", "--help")
+        self.assertEqual(proc.returncode, 0)
+        self.assertIn("usage:", proc.stdout)
+        self.assertIn("--peak_search", proc.stdout)
+
+    def test_module_help_works(self):
+        proc = _run("-m", "rfg_adc_plotter.main", "--help")
+        self.assertEqual(proc.returncode, 0)
+        self.assertIn("usage:", proc.stdout)
+        self.assertIn("--parser_16_bit_x2", proc.stdout)
+
+    def test_backend_mpl_reports_removal(self):
+        proc = _run("-m", "rfg_adc_plotter.main", "/dev/null", "--backend", "mpl")
+        self.assertNotEqual(proc.returncode, 0)
+        self.assertIn("Matplotlib backend removed", proc.stderr)
+
+
+if __name__ == "__main__":
+    unittest.main()