Added unit test for Cmd.select() return values

CHANGELOG.md

@@ -2,6 +2,8 @@
 * Bug Fixes
   * Fixed `AttributeError` in `rl_get_prompt()` when prompt is `None`.
   * Fixed bug where using choices on a Settable didn't verify that a valid choice had been entered.
+  * Fixed bug introduced in cmd2 2.0.0 in which `select()` converts return values to strings. It should never
+    have converted return values.
 * Enhancements
   * Added settings to Column class which prevent a table from overriding existing styles in header
     and/or data text. This allows for things like nesting an AlternatingTable in another AlternatingTable.

tests/test_cmd2.py

@@ -1220,6 +1220,12 @@ def do_play(self, arg):
         result = 'Charm us with the {}...\n'.format(instrument)
         self.stdout.write(result)
 
+    def do_return_type(self, arg):
+        """Test that return values can be non-strings"""
+        choice = self.select([(1, 'Integer'), ("test_str", 'String'), (self.do_play, 'Method')], 'Choice? ')
+        result = f'The return type is {type(choice)}\n'
+        self.stdout.write(result)
+
 
 @pytest.fixture
 def select_app():
@@ -1382,6 +1388,38 @@ def test_select_uneven_list_of_tuples(select_app, monkeypatch):
     assert out == expected
 
 
+@pytest.mark.parametrize(
+    'selection, type_str',
+    [
+        ('1', "<class 'int'>"),
+        ('2', "<class 'str'>"),
+        ('3', "<class 'method'>"),
+    ],
+)
+def test_select_return_type(select_app, monkeypatch, selection, type_str):
+    # Mock out the input call so we don't actually wait for a user's response on stdin
+    read_input_mock = mock.MagicMock(name='read_input', return_value=selection)
+    monkeypatch.setattr("cmd2.Cmd.read_input", read_input_mock)
+
+    out, err = run_cmd(select_app, "return_type")
+    expected = normalize(
+        """
+   1. Integer
+   2. String
+   3. Method
+The return type is {}
+""".format(
+            type_str
+        )
+    )
+
+    # Make sure our mock was called with the expected arguments
+    read_input_mock.assert_called_once_with('Choice? ')
+
+    # And verify the expected output to stdout
+    assert out == expected
+
+
 def test_select_eof(select_app, monkeypatch):
     # Ctrl-D during select causes an EOFError that just reprompts the user
     read_input_mock = mock.MagicMock(name='read_input', side_effect=[EOFError, 2])