Added some tests for command completion, help completion, and shell command completion

TODO: Still need to add a bunch of tests for path competion and more tests for all of the above mentioned completion cases.

Author: tleonhardt

tests/test_completion.py

@@ -0,0 +1,97 @@
+# coding=utf-8
+"""
+Unit/functional testing for readline tab-completion functions in the cmd2.py module.
+
+These are primarily tests related to readline completer functions which handle tab-completion of cmd2/cmd commands,
+file system paths, and shell commands.
+
+Copyright 2017 Todd Leonhardt <[email protected]>
+Released under MIT license, see LICENSE file
+"""
+import sys
+
+import cmd2
+import pytest
+
+
+@pytest.fixture
+def cmd2_app():
+    c = cmd2.Cmd()
+    return c
+
+
+def test_cmd2_command_completion_single_end(cmd2_app):
+    text = 'he'
+    line = 'he'
+    begidx = 0
+    endidx = 2
+    # It is at end of line, so extra space is present
+    assert cmd2_app.completenames(text, line, begidx, endidx) == ['help ']
+
+def test_cmd2_command_completion_single_mid(cmd2_app):
+    text = 'he'
+    line = 'he'
+    begidx = 0
+    endidx = 1
+    # It is not at end of line, so no extra space
+    assert cmd2_app.completenames(text, line, begidx, endidx) == ['help']
+
+def test_cmd2_command_completion_multiple(cmd2_app):
+    text = 'h'
+    line = 'h'
+    begidx = 0
+    endidx = 1
+    # It is not at end of line, so no extra space
+    assert cmd2_app.completenames(text, line, begidx, endidx) == ['help', 'history']
+
+def test_cmd2_help_completion_single_end(cmd2_app):
+    text = 'he'
+    line = 'help he'
+    begidx = 5
+    endidx = 7
+    # Even though it is at end of line, no extra space is present when tab completing a command name to get help on
+    assert cmd2_app.completenames(text, line, begidx, endidx) == ['help']
+
+def test_cmd2_help_completion_single_mid(cmd2_app):
+    text = 'he'
+    line = 'help he'
+    begidx = 5
+    endidx = 6
+    assert cmd2_app.completenames(text, line, begidx, endidx) == ['help']
+
+def test_cmd2_help_completion_multiple(cmd2_app):
+    text = 'h'
+    line = 'help h'
+    begidx = 5
+    endidx = 6
+    assert cmd2_app.completenames(text, line, begidx, endidx) == ['help', 'history']
+
+def test_shell_command_completion(cmd2_app):
+    if sys.platform == "win32":
+        text = 'di'
+        line = '!di'
+        begidx = 1
+        endidx = 3
+        assert cmd2_app.complete_shell(text, line, begidx, endidx) == ['dir ']
+    else:
+        text = 'eg'
+        line = '!eg'
+        begidx = 1
+        endidx = 3
+        assert cmd2_app.complete_shell(text, line, begidx, endidx) == ['egrep ']
+
+def test_shell_command_completion_multiple(cmd2_app):
+    if sys.platform == "win32":
+        text = 'd'
+        line = '!d'
+        begidx = 1
+        endidx = 2
+        assert 'dir' in cmd2_app.complete_shell(text, line, begidx, endidx)
+    else:
+        text = 'l'
+        line = '!l'
+        begidx = 1
+        endidx = 2
+        assert 'ls' in cmd2_app.complete_shell(text, line, begidx, endidx)
+
+# TODO: Add tests for path completion