Test: Add unit test

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

CHANGELOG.rst

@@ -14,6 +14,8 @@ Current changes
 Added
 -----
 
+* Test: Unit test against command line.
+
 Changed
 -------
 
@@ -30,7 +32,7 @@ Security
 --------
 
 `v0.6a1`_ (17, Nov., 2019)
-=========================
+==========================
 
 Added
 -----
@@ -50,7 +52,7 @@ Fixed
 * Dependency for py7zr only for python > 3.5. Now it works with python2.7.
 
 `v0.5`_ (10, Nov., 2019)
-=========================
+========================
 
 Changed
 -------
@@ -163,7 +165,7 @@ Fixed
 
 
 `v0.3.1`_ (15, March, 2019)
-==========================
+===========================
 
 Added
 -----
@@ -240,7 +242,7 @@ Changed
 * Support  multiprocess concurrent download and installation.
 
 `v0.0.2`_ (4, March, 2019)
-========================
+==========================
 
 Added
 =====

tests/test_cli.py

@@ -1,8 +1,27 @@
-import os
-
-import pytest
-
 import aqt
 
 
+def test_cli_help(capsys):
+    expected = "".join(["show help\n",
+                        "usage: aqt [-h] [--logging-conf LOGGING_CONF] [--logger LOGGER] [--dry-run]\n",
+                        "           {install,tool,list,help} ...\n",
+                        "\n",
+                        "Installer for Qt SDK.\n",
+                        "\n",
+                        "optional arguments:\n",
+                        "  -h, --help            show this help message and exit\n",
+                        "  --logging-conf LOGGING_CONF\n",
+                        "                        Specify logging configuration YAML file.\n",
+                        "  --logger LOGGER       Specify logger name\n",
+                        "  --dry-run             Dry run operations.\n",
+                        "\n",
+                        "subcommands:\n",
+                        "  Valid subcommands\n",
+                        "\n",
+                        "  {install,tool,list,help}\n",
+                        "                        subcommand for aqt Qt installer\n"])
+    cli = aqt.cli.Cli()
+    cli.run(["help"])
+    out, err = capsys.readouterr()
+    assert out == expected