fix: handle tests passing sys.argv

arger/decorator.py

@@ -1,3 +1,4 @@
+import sys
 from argparse import ArgumentParser
 from typing import Any, Callable, Dict, Optional
 
@@ -45,7 +46,7 @@ def __init__(self, fn: Optional[F] = None, **kwargs):
         if fn:  # lazily add arguments
             _add_args(self, self._command.args)
 
-    def run(self, *args) -> Any:
+    def run(self, *args, capture_sys=True) -> Any:
         """Dispatch functions.
 
         The arguments will be passed onto self.parse_args
@@ -57,7 +58,9 @@ def run(self, *args) -> Any:
         # populate sub-parsers
         _add_parsers(self, self._command)
 
-        kwargs = vars(self.parse_args(args or None))  # type: Dict[str, Any]
+        if not args and capture_sys:
+            args = tuple(sys.argv[:1])
+        kwargs = vars(self.parse_args(args))  # type: Dict[str, Any]
 
         return self._command.run(**kwargs)
 

tests/test_dispatcher.py

@@ -23,19 +23,13 @@ def args(cmd: str):
 def test_example(capsys, arger, args, expected: str):
     if "error" in expected or expected.startswith('usage:'):
         with pytest.raises(SystemExit):
-            arger.run(*args)  # start function
+            arger.run(*args, capture_sys=False)  # start function
     else:
-        arger.run(*args)
+        arger.run(*args, capture_sys=False)
 
     capture = capsys.readouterr()
     out = capture.err or capture.out
-
-    if out != expected:
-        import time
-
-        tmp = Path(__file__).with_name('-'.join(args) + str(time.time()) + ".log")
-        tmp.write_text("\n\n\n".join([out, expected]))
-    assert out == expected
+    assert out == expected, f"\ncmd: {args}\nout: \n{out}\nexpected:\n{expected}\n"
 
 
 # def test_var_positional_help(capsys, arg):

tox.ini

@@ -11,7 +11,9 @@ python =
     3.8: py38
 
 [testenv]
-whitelist_externals = poetry
+whitelist_externals =
+    poetry
+    make
 skip_install = true
 commands =
     poetry install