fix missing tests error

tanco/driver.py

@@ -2,25 +2,25 @@
 """
 command-line driver for tanco client.
 """
 import argparse
 import asyncio
 import cmd as cmdlib
 import os
 import shlex
 import sqlite3
 import subprocess
 import sys
 import webbrowser
 import pprint
 
 import jwt as jwtlib
 import websockets as w
 
 from . import database as db
 from . import model as m
 from . import orgtest, runner
 from .client import TancoClient
 from .model import Config, TestDescription
 
 class TancoDriver(cmdlib.Cmd):
     prompt = 'tanco> '
@@ -154,18 +154,18 @@
         num_desc_removed = sum(1 for line in lines if line.strip().startswith(': '))
 
         # Show summary
         has_todo = any(l.strip().lower().startswith('#+todo:') for l in lines)
         print(f'{"Would migrate" if args.check else "Migrating"}: {args.file}')
         print(f'Changes:')
         print(f'  - Add #+tanco-format: 0.2 directive')
         if not has_todo:
             print(f'  - Add #+todo: TODO | DONE TEST directive')
         print(f'  - Migrate {num_tests} tests')
         print(f'  - Remove {num_name_removed} #+name: directives')
         print(f'  - Remove TODO/DONE from test headlines')
         print(f'  - Remove {num_title_removed} = title lines')
         print(f'  - Remove {num_desc_removed} : description lines')
         print(f'  - Move description text to test bodies')
         print()
 
         if args.check:
@@ -229,7 +229,7 @@
             try:
                 arg = self.result[int(arg)]['name']
             except IndexError:
                 print(f"Sorry, challenge number {arg} not found.")
                 return
         if arg == '--local':
             print('starting local challenge.')
@@ -465,6 +465,19 @@
         except runner.NoTestPlanError:
             runner.error(cfg, ['No challenge selected.',
                               'Use `tanco init`, `tanco test -t file.org`, or set TEST_PLAN environment variable.'])
+        except runner.NoTestsFoundError as e:
+            runner.error(cfg, [str(e),
+                              '',
+                              'For org files, tests should be defined using:',
+                              '  ** TEST testname : title',
+                              '  #+begin_src',
+                              '  > input line',
+                              '  expected output',
+                              '  #+end_src'])
+        except FileNotFoundError as e:
+            runner.error(cfg, [f'Test file not found: {e.filename}',
+                              '',
+                              'Make sure the path is correct and the file exists.'])
         except runner.StopTesting:
             pass
         except Exception:
@@ -531,8 +544,21 @@
             runner.run_tests(cfg)
         except runner.NoTestPlanError:
             print("No tests specified. Use --tests PATH or ensure you're in a tanco project.")
+        except runner.NoTestsFoundError as e:
+            print(str(e))
+            print()
+            print('For org files, tests should be defined using:')
+            print('  ** TEST testname : title')
+            print('  #+begin_src')
+            print('  > input line')
+            print('  expected output')
+            print('  #+end_src')
+        except FileNotFoundError as e:
+            print(f'Test file not found: {e.filename}')
+            print()
+            print('Make sure the path is correct and the file exists.')
         except runner.StopTesting:
-            pass # Normal exit after test failure
+            pass  # Normal exit after test failure
         except Exception:
             # handle_unexpected_error already prints traceback
             runner.handle_unexpected_error(cfg)

tanco/runner.py

@@ -94,6 +94,10 @@ class NoTestPlanError(Exception):
     pass
 
 
+class NoTestsFoundError(Exception):
+    """Raised when a test source exists but contains no tests."""
+
+
 class StopTesting(Exception):
     pass
 
@@ -354,6 +358,14 @@ def run_tests(cfg: Config, names=None):
     challenge = get_challenge(cfg)
     tests = challenge.tests
 
+    # Check for empty tests list
+    if not tests:
+        source = cfg.test_path or cfg.test_plan or 'database'
+        raise NoTestsFoundError(
+            f'No tests found in {source}. '
+            'Make sure the file contains valid test definitions.',
+        )
+
     # Use persistent process mode if restart_cmd is configured
     if cfg.restart_cmd and cfg.restart_expect:
         run_tests_persistent(cfg, tests, names)
@@ -502,8 +514,21 @@ def main(names: list[str]):
     try:
         run_tests(cfg, names)
     except NoTestPlanError:
-        error(cfg, ['No challenge selected.'
+        error(cfg, ['No challenge selected.',
                     'Use `tanco init` or set TEST_PLAN environment variable.'])
+    except NoTestsFoundError as e:
+        error(cfg, [str(e),
+                    '',
+                    'For org files, tests should be defined using:',
+                    '  ** TEST testname : title',
+                    '  #+begin_src',
+                    '  > input line',
+                    '  expected output',
+                    '  #+end_src'])
+    except FileNotFoundError as e:
+        error(cfg, [f'Test file not found: {e.filename}',
+                    '',
+                    'Make sure the path is correct and the file exists.'])
     except StopTesting:
         pass
     except Exception: