made test for cavern more robust against legs v shots

core/TESTS/test_imports.py

@@ -275,7 +275,7 @@ class SubprocessTest(TestCase):
             self.assertTrue(sp.returncode == 0, f"{cwd} - survex is unhappy")
 
             content = sp.stdout
-            ph = r"Total length of survey legs"
+            ph = r"Total plan length of survey"
             phmatch = re.search(ph, content)
             msg = f'{cwd} - Failed to find expected survex output: "{ph}"'
             self.assertIsNotNone(phmatch, msg)