When testing the command line, call main method.

Previously, we were spawning the main binary in a subprocess, which is
fragile and interacts poorly with some testing frameworks...

dosagelib/cmd.py

@@ -322,10 +322,10 @@ def get_tagged_scraper_name(scraperobj, limit=None, reasons=None):
     return name + suffix
 
 
-def main():
+def main(args=None):
     """Parse options and execute commands."""
     try:
-        options = setup_options().parse_args()
+        options = setup_options().parse_args(args=args)
         options.basepath = os.path.expanduser(options.basepath)
         res = run(options)
     except KeyboardInterrupt:

tests/__init__.py

@@ -1,29 +0,0 @@
-# -*- coding: utf-8 -*-
-# Copyright (C) 2013-2014 Bastian Kleineidam
-# Copyright (C) 2015-2017 Tobias Gruetzmacher
-
-from __future__ import absolute_import, division, print_function
-
-import os
-import subprocess
-
-basedir = os.path.dirname(__file__)
-dosage_cmd = os.path.join(os.path.dirname(basedir), "dosage")
-
-
-def run(cmd, verbosity=0, **kwargs):
-    """Run command without error checking.
-    @return: command return code"""
-    if kwargs.get("shell"):
-        # for shell calls the command must be a string
-        cmd = " ".join(cmd)
-    return subprocess.call(cmd, **kwargs)
-
-
-def run_checked(cmd, ret_ok=(0,), **kwargs):
-    """Run command and raise OSError on error."""
-    retcode = run(cmd, **kwargs)
-    if retcode not in ret_ok:
-        msg = "Command `%s' returned non-zero exit status %d" % (cmd, retcode)
-        raise OSError(msg)
-    return retcode

tests/test_dosage.py

@@ -1,58 +1,61 @@
 # -*- coding: utf-8 -*-
 # Copyright (C) 2004-2008 Tristan Seligmann and Jonathan Jacobs
 # Copyright (C) 2012-2014 Bastian Kleineidam
-# Copyright (C) 2015-2016 Tobias Gruetzmacher
+# Copyright (C) 2015-2017 Tobias Gruetzmacher
 
 from __future__ import absolute_import, division, print_function
 
 import pytest
 import sys
 
-from . import dosage_cmd, run_checked
+import dosagelib.cmd
 
+def cmd(*options):
+    """'Fake' run dosage with given options."""
+    return dosagelib.cmd.main(('--allow-multiple',) + options)
 
-def run_with_options(options, cmd=dosage_cmd):
-    """Run dosage with given options."""
-    run_checked([sys.executable, cmd, '--allow-multiple'] + options)
+def cmd_ok(*options):
+    assert cmd(*options) == 0
 
+def cmd_err(*options):
+    assert cmd(*options) == 1
 
 class TestDosage(object):
     """Test the dosage commandline client."""
 
     def test_list_comics(self):
         for option in ("-l", "--list", "--singlelist"):
-            run_with_options([option])
+            cmd_ok(option)
 
     def test_display_version(self):
-        run_with_options(["--version"])
+        cmd_ok("--version")
 
     def test_display_help(self):
         for option in ("-h", "--help"):
-            run_with_options([option])
+            with pytest.raises(SystemExit):
+                cmd(option)
 
     def test_module_help(self):
-        run_with_options(["-m", "xkcd"])
+        cmd_ok("-m", "xkcd")
 
     def test_no_comics_specified(self):
-        with pytest.raises(OSError):
-            run_with_options([])
+        cmd_err()
 
     def test_unknown_option(self):
-        with pytest.raises(OSError):
-            run_with_options(['--imadoofus'])
+        with pytest.raises(SystemExit):
+            cmd('--imadoofus')
 
     def test_multiple_comics_match(self):
-        with pytest.raises(OSError):
-            run_with_options(['Garfield'])
+        cmd_err('Garfield')
 
     def test_fetch_html_and_rss_json(self, tmpdir):
-        run_with_options(["-n", "2", "-v", "-b", str(tmpdir), "-o", "html",
-                          "-o", "rss", "-o", "json", "xkcd"])
+        cmd_ok("-n", "2", "-v", "-b", str(tmpdir), "-o", "html", "-o", "rss",
+                "-o", "json", "xkcd")
 
     def test_fetch_html_and_rss_2(self, tmpdir):
-        run_with_options(["--numstrips", "2", "--baseurl", "bla",
-                          "--basepath", str(tmpdir), "--output", "rss",
-                          "--output", "html", "--adult", "BloomingFaeries"])
+        cmd_ok("--numstrips", "2", "--baseurl", "bla", "--basepath",
+                str(tmpdir), "--output", "rss", "--output", "html", "--adult",
+                "BloomingFaeries")
 
     def test_fetch_indexed(self, tmpdir):
-        run_with_options(["-n", "2", "-v", "-b", str(tmpdir), "xkcd:303"])
+        cmd_ok("-n", "2", "-v", "-b", str(tmpdir), "xkcd:303")