Adding upstream version 2.1.0.upstream/2.1.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

18 files changed, 1307 insertions, 0 deletions

diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/__init__.py
diff --git a/tests/compat.py b/tests/compat.py
new file mode 100644
index 0000000..383963a
--- /dev/null
+++ b/tests/compat.py
@@ -0,0 +1,78 @@
+# -*- coding: utf-8 -*-
+"""Python compatibility support for CLI Helpers' tests."""
+
+from __future__ import unicode_literals
+import os as _os
+import shutil as _shutil
+import tempfile as _tempfile
+import warnings as _warnings
+
+from cli_helpers.compat import PY2
+
+
+class _TempDirectory(object):
+    """Create and return a temporary directory.  This has the same
+    behavior as mkdtemp but can be used as a context manager.  For
+    example:
+
+        with TemporaryDirectory() as tmpdir:
+            ...
+
+    Upon exiting the context, the directory and everything contained
+    in it are removed.
+
+    NOTE: Copied from the Python 3 standard library.
+    """
+
+    # Handle mkdtemp raising an exception
+    name = None
+    _closed = False
+
+    def __init__(self, suffix="", prefix='tmp', dir=None):
+        self.name = _tempfile.mkdtemp(suffix, prefix, dir)
+
+    def __repr__(self):
+        return "<{} {!r}>".format(self.__class__.__name__, self.name)
+
+    def __enter__(self):
+        return self.name
+
+    def cleanup(self, _warn=False, _warnings=_warnings):
+        if self.name and not self._closed:
+            try:
+                _shutil.rmtree(self.name)
+            except (TypeError, AttributeError) as ex:
+                if "None" not in '%s' % (ex,):
+                    raise
+                self._rmtree(self.name)
+            self._closed = True
+            if _warn and _warnings.warn:
+                _warnings.warn("Implicitly cleaning up {!r}".format(self),
+                               ResourceWarning)
+
+    def __exit__(self, exc, value, tb):
+        self.cleanup()
+
+    def __del__(self):
+        # Issue a ResourceWarning if implicit cleanup needed
+        self.cleanup(_warn=True)
+
+    def _rmtree(self, path, _OSError=OSError, _sep=_os.path.sep,
+                _listdir=_os.listdir, _remove=_os.remove, _rmdir=_os.rmdir):
+        # Essentially a stripped down version of shutil.rmtree.  We can't
+        # use globals because they may be None'ed out at shutdown.
+        if not isinstance(path, str):
+            _sep = _sep.encode()
+        try:
+            for name in _listdir(path):
+                fullname = path + _sep + name
+                try:
+                    _remove(fullname)
+                except _OSError:
+                    self._rmtree(fullname)
+            _rmdir(path)
+        except _OSError:
+            pass
+
+
+TemporaryDirectory = _TempDirectory if PY2 else _tempfile.TemporaryDirectory
diff --git a/tests/config_data/configrc b/tests/config_data/configrc
new file mode 100644
index 0000000..2544726
--- /dev/null
+++ b/tests/config_data/configrc
@@ -0,0 +1,18 @@
+# vi: ft=dosini
+# Test file comment
+
+[section]
+# Test section comment
+
+# Test field comment
+test_boolean_default = True
+
+# Test field commented out
+# Uncomment to enable
+# test_boolean = True
+
+test_string_file = '~/myfile'
+
+test_option = 'foobar'
+
+[section2]
diff --git a/tests/config_data/configspecrc b/tests/config_data/configspecrc
new file mode 100644
index 0000000..35b7777
--- /dev/null
+++ b/tests/config_data/configspecrc
@@ -0,0 +1,20 @@
+# vi: ft=dosini
+# Test file comment
+
+[section]
+# Test section comment
+
+# Test field comment
+test_boolean_default = boolean(default=True)
+
+test_boolean = boolean()
+
+# Test field commented out
+# Uncomment to enable
+# test_boolean = True
+
+test_string_file = string(default='~/myfile')
+
+test_option = option('foo', 'bar', 'foobar', default='foobar')
+
+[section2]
diff --git a/tests/config_data/invalid_configrc b/tests/config_data/invalid_configrc
new file mode 100644
index 0000000..271c9c5
--- /dev/null
+++ b/tests/config_data/invalid_configrc
@@ -0,0 +1,18 @@
+# vi: ft=dosini
+# Test file comment
+
+[section]
+# Test section comment
+
+# Test field comment
+test_boolean_default True
+
+# Test field commented out
+# Uncomment to enable
+# test_boolean = True
+
+test_string_file = '~/myfile'
+
+test_option = 'foobar'
+
+[section2]
diff --git a/tests/config_data/invalid_configspecrc b/tests/config_data/invalid_configspecrc
new file mode 100644
index 0000000..551473f
--- /dev/null
+++ b/tests/config_data/invalid_configspecrc
@@ -0,0 +1,20 @@
+# vi: ft=dosini
+# Test file comment
+
+[section]
+# Test section comment
+
+# Test field comment
+test_boolean_default = boolean(default=True)
+
+test_boolean = bool(default=False)
+
+# Test field commented out
+# Uncomment to enable
+# test_boolean = True
+
+test_string_file = string(default='~/myfile')
+
+test_option = option('foo', 'bar', 'foobar', default='foobar')
+
+[section2]
diff --git a/tests/tabular_output/__init__.py b/tests/tabular_output/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/tabular_output/__init__.py
diff --git a/tests/tabular_output/test_delimited_output_adapter.py b/tests/tabular_output/test_delimited_output_adapter.py
new file mode 100644
index 0000000..3627b84
--- /dev/null
+++ b/tests/tabular_output/test_delimited_output_adapter.py
@@ -0,0 +1,48 @@
+# -*- coding: utf-8 -*-
+"""Test the delimited output adapter."""
+
+from __future__ import unicode_literals
+from textwrap import dedent
+
+import pytest
+
+from cli_helpers.tabular_output import delimited_output_adapter
+
+
+def test_csv_wrapper():
+    """Test the delimited output adapter."""
+    # Test comma-delimited output.
+    data = [['abc', '1'], ['d', '456']]
+    headers = ['letters', 'number']
+    output = delimited_output_adapter.adapter(iter(data), headers, dialect='unix')
+    assert "\n".join(output) == dedent('''\
+        "letters","number"\n\
+        "abc","1"\n\
+        "d","456"''')
+
+    # Test tab-delimited output.
+    data = [['abc', '1'], ['d', '456']]
+    headers = ['letters', 'number']
+    output = delimited_output_adapter.adapter(
+        iter(data), headers, table_format='csv-tab', dialect='unix')
+    assert "\n".join(output) == dedent('''\
+        "letters"\t"number"\n\
+        "abc"\t"1"\n\
+        "d"\t"456"''')
+
+    with pytest.raises(ValueError):
+        output = delimited_output_adapter.adapter(
+            iter(data), headers, table_format='foobar')
+        list(output)
+
+
+def test_unicode_with_csv():
+    """Test that the csv wrapper can handle non-ascii characters."""
+    data = [['观音', '1'], ['Ποσειδῶν', '456']]
+    headers = ['letters', 'number']
+    output = delimited_output_adapter.adapter(data, headers)
+    assert "\n".join(output) == dedent('''\
+        letters,number\n\
+        观音,1\n\
+        Ποσειδῶν,456''')
+
diff --git a/tests/tabular_output/test_output_formatter.py b/tests/tabular_output/test_output_formatter.py
new file mode 100644
index 0000000..0509cb6
--- /dev/null
+++ b/tests/tabular_output/test_output_formatter.py
@@ -0,0 +1,173 @@
+# -*- coding: utf-8 -*-
+"""Test the generic output formatter interface."""
+
+from __future__ import unicode_literals
+from decimal import Decimal
+from textwrap import dedent
+
+import pytest
+
+from cli_helpers.tabular_output import format_output, TabularOutputFormatter
+from cli_helpers.compat import binary_type, text_type
+from cli_helpers.utils import strip_ansi
+
+
+def test_tabular_output_formatter():
+    """Test the TabularOutputFormatter class."""
+    headers = ['text', 'numeric']
+    data = [
+        ["abc", Decimal(1)],
+        ["defg", Decimal("11.1")],
+        ["hi", Decimal("1.1")],
+        ["Pablo\rß\n", 0],
+    ]
+    expected = dedent("""\
+        +------------+---------+
+        | text       | numeric |
+        +------------+---------+
+        | abc        | 1       |
+        | defg       | 11.1    |
+        | hi         | 1.1     |
+        | Pablo\\rß\\n | 0       |
+        +------------+---------+"""
+    )
+
+    print(expected)
+    print("\n".join(TabularOutputFormatter().format_output(
+        iter(data), headers, format_name='ascii')))
+    assert expected == "\n".join(TabularOutputFormatter().format_output(
+        iter(data), headers, format_name='ascii'))
+
+
+def test_tabular_format_output_wrapper():
+    """Test the format_output wrapper."""
+    data = [['1', None], ['2', 'Sam'],
+            ['3', 'Joe']]
+    headers = ['id', 'name']
+    expected = dedent('''\
+        +----+------+
+        | id | name |
+        +----+------+
+        | 1  | N/A  |
+        | 2  | Sam  |
+        | 3  | Joe  |
+        +----+------+''')
+
+    assert expected == "\n".join(format_output(iter(data), headers, format_name='ascii',
+                                               missing_value='N/A'))
+
+
+def test_additional_preprocessors():
+    """Test that additional preprocessors are run."""
+    def hello_world(data, headers, **_):
+        def hello_world_data(data):
+            for row in data:
+                for i, value in enumerate(row):
+                    if value == 'hello':
+                        row[i] = "{}, world".format(value)
+                yield row
+        return hello_world_data(data), headers
+
+    data = [['foo', None], ['hello!', 'hello']]
+    headers = 'ab'
+
+    expected = dedent('''\
+        +--------+--------------+
+        | a      | b            |
+        +--------+--------------+
+        | foo    | hello        |
+        | hello! | hello, world |
+        +--------+--------------+''')
+
+    assert expected == "\n".join(TabularOutputFormatter().format_output(
+        iter(data), headers, format_name='ascii', preprocessors=(hello_world,),
+        missing_value='hello'))
+
+
+def test_format_name_attribute():
+    """Test the the format_name attribute be set and retrieved."""
+    formatter = TabularOutputFormatter(format_name='plain')
+    assert formatter.format_name == 'plain'
+    formatter.format_name = 'simple'
+    assert formatter.format_name == 'simple'
+
+    with pytest.raises(ValueError):
+        formatter.format_name = 'foobar'
+
+
+def test_unsupported_format():
+    """Test that TabularOutputFormatter rejects unknown formats."""
+    formatter = TabularOutputFormatter()
+
+    with pytest.raises(ValueError):
+        formatter.format_name = 'foobar'
+
+    with pytest.raises(ValueError):
+        formatter.format_output((), (), format_name='foobar')
+
+
+def test_tabulate_ansi_escape_in_default_value():
+    """Test that ANSI escape codes work with tabulate."""
+
+    data = [['1', None], ['2', 'Sam'],
+            ['3', 'Joe']]
+    headers = ['id', 'name']
+
+    styled = format_output(iter(data), headers, format_name='psql',
+                           missing_value='\x1b[38;5;10mNULL\x1b[39m')
+    unstyled = format_output(iter(data), headers, format_name='psql',
+                             missing_value='NULL')
+
+    stripped_styled = [strip_ansi(s) for s in styled]
+
+    assert list(unstyled) == stripped_styled
+
+
+def test_get_type():
+    """Test that _get_type returns the expected type."""
+    formatter = TabularOutputFormatter()
+
+    tests = ((1, int), (2.0, float), (b'binary', binary_type),
+             ('text', text_type), (None, type(None)), ((), text_type))
+
+    for value, data_type in tests:
+        assert data_type is formatter._get_type(value)
+
+
+def test_provide_column_types():
+    """Test that provided column types are passed to preprocessors."""
+    expected_column_types = (bool, float)
+    data = ((1, 1.0), (0, 2))
+    headers = ('a', 'b')
+
+    def preprocessor(data, headers, column_types=(), **_):
+        assert expected_column_types == column_types
+        return data, headers
+
+    format_output(data, headers, 'csv',
+                  column_types=expected_column_types,
+                  preprocessors=(preprocessor,))
+
+
+def test_enforce_iterable():
+    """Test that all output formatters accept iterable"""
+    formatter = TabularOutputFormatter()
+    loremipsum = 'lorem ipsum dolor sit amet consectetur adipiscing elit sed do eiusmod'.split(' ')
+
+    for format_name in formatter.supported_formats:
+        formatter.format_name = format_name
+        try:
+            formatted = next(formatter.format_output(
+                zip(loremipsum), ['lorem']))
+        except TypeError:
+            assert False, "{0} doesn't return iterable".format(format_name)
+
+
+def test_all_text_type():
+    """Test the TabularOutputFormatter class."""
+    data = [[1, u"", None, Decimal(2)]]
+    headers = ['col1', 'col2', 'col3', 'col4']
+    output_formatter = TabularOutputFormatter()
+    for format_name in output_formatter.supported_formats:
+        for row in output_formatter.format_output(iter(data), headers, format_name=format_name):
+            assert isinstance(row, text_type), "not unicode for {}".format(format_name)
diff --git a/tests/tabular_output/test_preprocessors.py b/tests/tabular_output/test_preprocessors.py
new file mode 100644
index 0000000..e579bbe
--- /dev/null
+++ b/tests/tabular_output/test_preprocessors.py
@@ -0,0 +1,334 @@
+# -*- coding: utf-8 -*-
+"""Test CLI Helpers' tabular output preprocessors."""
+
+from __future__ import unicode_literals
+from decimal import Decimal
+
+import pytest
+
+from cli_helpers.compat import HAS_PYGMENTS
+from cli_helpers.tabular_output.preprocessors import (
+    align_decimals, bytes_to_string, convert_to_string, quote_whitespaces,
+    override_missing_value, override_tab_value, style_output, format_numbers)
+
+if HAS_PYGMENTS:
+    from pygments.style import Style
+    from pygments.token import Token
+
+import inspect
+import cli_helpers.tabular_output.preprocessors
+import types
+
+
+def test_convert_to_string():
+    """Test the convert_to_string() function."""
+    data = [[1, 'John'], [2, 'Jill']]
+    headers = [0, 'name']
+    expected = ([['1', 'John'], ['2', 'Jill']], ['0', 'name'])
+    results = convert_to_string(data, headers)
+
+    assert expected == (list(results[0]), results[1])
+
+
+def test_override_missing_values():
+    """Test the override_missing_values() function."""
+    data = [[1, None], [2, 'Jill']]
+    headers = [0, 'name']
+    expected = ([[1, '<EMPTY>'], [2, 'Jill']], [0, 'name'])
+    results = override_missing_value(data, headers, missing_value='<EMPTY>')
+
+    assert expected == (list(results[0]), results[1])
+
+
+@pytest.mark.skipif(not HAS_PYGMENTS, reason='requires the Pygments library')
+def test_override_missing_value_with_style():
+    """Test that *override_missing_value()* styles output."""
+
+    class NullStyle(Style):
+        styles = {
+            Token.Output.Null: '#0f0'
+        }
+
+    headers = ['h1', 'h2']
+    data = [[None, '2'], ['abc', None]]
+
+    expected_headers = ['h1', 'h2']
+    expected_data = [
+        ['\x1b[38;5;10m<null>\x1b[39m', '2'],
+        ['abc', '\x1b[38;5;10m<null>\x1b[39m']
+    ]
+    results = override_missing_value(data, headers, 
+                                     style=NullStyle, missing_value="<null>")
+
+    assert (expected_data, expected_headers) == (list(results[0]), results[1])
+
+
+def test_override_tab_value():
+    """Test the override_tab_value() function."""
+    data = [[1, '\tJohn'], [2, 'Jill']]
+    headers = ['id', 'name']
+    expected = ([[1, '    John'], [2, 'Jill']], ['id', 'name'])
+    results = override_tab_value(data, headers)
+
+    assert expected == (list(results[0]), results[1])
+
+
+def test_bytes_to_string():
+    """Test the bytes_to_string() function."""
+    data = [[1, 'John'], [2, b'Jill']]
+    headers = [0, 'name']
+    expected = ([[1, 'John'], [2, 'Jill']], [0, 'name'])
+    results = bytes_to_string(data, headers)
+
+    assert expected == (list(results[0]), results[1])
+
+
+def test_align_decimals():
+    """Test the align_decimals() function."""
+    data = [[Decimal('200'), Decimal('1')], [
+        Decimal('1.00002'), Decimal('1.0')]]
+    headers = ['num1', 'num2']
+    column_types = (float, float)
+    expected = ([['200', '1'], ['  1.00002', '1.0']], ['num1', 'num2'])
+    results = align_decimals(data, headers, column_types=column_types)
+
+    assert expected == (list(results[0]), results[1])
+
+
+def test_align_decimals_empty_result():
+    """Test align_decimals() with no results."""
+    data = []
+    headers = ['num1', 'num2']
+    column_types = ()
+    expected = ([], ['num1', 'num2'])
+    results = align_decimals(data, headers, column_types=column_types)
+
+    assert expected == (list(results[0]), results[1])
+
+
+def test_align_decimals_non_decimals():
+    """Test align_decimals() with non-decimals."""
+    data = [[Decimal('200.000'), Decimal('1.000')], [None, None]]
+    headers = ['num1', 'num2']
+    column_types = (float, float)
+    expected = ([['200.000', '1.000'], [None, None]], ['num1', 'num2'])
+    results = align_decimals(data, headers, column_types=column_types)
+
+    assert expected == (list(results[0]), results[1])
+
+
+def test_quote_whitespaces():
+    """Test the quote_whitespaces() function."""
+    data = [["  before", "after  "], ["  both  ", "none"]]
+    headers = ['h1', 'h2']
+    expected = ([["'  before'", "'after  '"], ["'  both  '", "'none'"]],
+                ['h1', 'h2'])
+    results = quote_whitespaces(data, headers)
+
+    assert expected == (list(results[0]), results[1])
+
+
+def test_quote_whitespaces_empty_result():
+    """Test the quote_whitespaces() function with no results."""
+    data = []
+    headers = ['h1', 'h2']
+    expected = ([], ['h1', 'h2'])
+    results = quote_whitespaces(data, headers)
+
+    assert expected == (list(results[0]), results[1])
+
+
+def test_quote_whitespaces_non_spaces():
+    """Test the quote_whitespaces() function with non-spaces."""
+    data = [["\tbefore", "after \r"], ["\n both  ", "none"]]
+    headers = ['h1', 'h2']
+    expected = ([["'\tbefore'", "'after \r'"], ["'\n both  '", "'none'"]],
+                ['h1', 'h2'])
+    results = quote_whitespaces(data, headers)
+
+    assert expected == (list(results[0]), results[1])
+
+
+@pytest.mark.skipif(not HAS_PYGMENTS, reason='requires the Pygments library')
+def test_style_output_no_styles():
+    """Test that *style_output()* does not style without styles."""
+    headers = ['h1', 'h2']
+    data = [['1', '2'], ['a', 'b']]
+    results = style_output(data, headers)
+
+    assert (data, headers) == (list(results[0]), results[1])
+
+
+@pytest.mark.skipif(HAS_PYGMENTS,
+                    reason='requires the Pygments library be missing')
+def test_style_output_no_pygments():
+    """Test that *style_output()* does not try to style without Pygments."""
+    headers = ['h1', 'h2']
+    data = [['1', '2'], ['a', 'b']]
+    results = style_output(data, headers)
+
+    assert (data, headers) == (list(results[0]), results[1])
+
+
+@pytest.mark.skipif(not HAS_PYGMENTS, reason='requires the Pygments library')
+def test_style_output():
+    """Test that *style_output()* styles output."""
+
+    class CliStyle(Style):
+        default_style = ""
+        styles = {
+            Token.Output.Header: 'bold ansibrightred',
+            Token.Output.OddRow: 'bg:#eee #111',
+            Token.Output.EvenRow: '#0f0'
+        }
+    headers = ['h1', 'h2']
+    data = [['观音', '2'], ['Ποσειδῶν', 'b']]
+
+    expected_headers = ['\x1b[91;01mh1\x1b[39;00m', '\x1b[91;01mh2\x1b[39;00m']
+    expected_data = [['\x1b[38;5;233;48;5;7m观音\x1b[39;49m',
+                      '\x1b[38;5;233;48;5;7m2\x1b[39;49m'],
+                     ['\x1b[38;5;10mΠοσειδῶν\x1b[39m', '\x1b[38;5;10mb\x1b[39m']]
+    results = style_output(data, headers, style=CliStyle)
+
+    assert (expected_data, expected_headers) == (list(results[0]), results[1])
+
+
+@pytest.mark.skipif(not HAS_PYGMENTS, reason='requires the Pygments library')
+def test_style_output_with_newlines():
+    """Test that *style_output()* styles output with newlines in it."""
+
+    class CliStyle(Style):
+        default_style = ""
+        styles = {
+            Token.Output.Header: 'bold ansibrightred',
+            Token.Output.OddRow: 'bg:#eee #111',
+            Token.Output.EvenRow: '#0f0'
+        }
+    headers = ['h1', 'h2']
+    data = [['观音\nLine2', 'Ποσειδῶν']]
+
+    expected_headers = ['\x1b[91;01mh1\x1b[39;00m', '\x1b[91;01mh2\x1b[39;00m']
+    expected_data = [
+        ['\x1b[38;5;233;48;5;7m观音\x1b[39;49m\n\x1b[38;5;233;48;5;7m'
+         'Line2\x1b[39;49m',
+         '\x1b[38;5;233;48;5;7mΠοσειδῶν\x1b[39;49m']]
+    results = style_output(data, headers, style=CliStyle)
+
+
+    assert (expected_data, expected_headers) == (list(results[0]), results[1])
+
+@pytest.mark.skipif(not HAS_PYGMENTS, reason='requires the Pygments library')
+def test_style_output_custom_tokens():
+    """Test that *style_output()* styles output with custom token names."""
+
+    class CliStyle(Style):
+        default_style = ""
+        styles = {
+            Token.Results.Headers: 'bold ansibrightred',
+            Token.Results.OddRows: 'bg:#eee #111',
+            Token.Results.EvenRows: '#0f0'
+        }
+    headers = ['h1', 'h2']
+    data = [['1', '2'], ['a', 'b']]
+
+    expected_headers = ['\x1b[91;01mh1\x1b[39;00m', '\x1b[91;01mh2\x1b[39;00m']
+    expected_data = [['\x1b[38;5;233;48;5;7m1\x1b[39;49m',
+                      '\x1b[38;5;233;48;5;7m2\x1b[39;49m'],
+                     ['\x1b[38;5;10ma\x1b[39m', '\x1b[38;5;10mb\x1b[39m']]
+
+    output = style_output(
+        data, headers, style=CliStyle,
+        header_token='Token.Results.Headers',
+        odd_row_token='Token.Results.OddRows',
+        even_row_token='Token.Results.EvenRows')
+
+    assert (expected_data, expected_headers) == (list(output[0]), output[1])
+
+
+def test_format_integer():
+    """Test formatting for an INTEGER datatype."""
+    data = [[1], [1000], [1000000]]
+    headers = ['h1']
+    result_data, result_headers = format_numbers(data,
+                                                 headers,
+                                                 column_types=(int,),
+                                                 integer_format=',',
+                                                 float_format=',')
+
+    expected = [['1'], ['1,000'], ['1,000,000']]
+    assert expected == list(result_data)
+    assert headers == result_headers
+
+
+def test_format_decimal():
+    """Test formatting for a DECIMAL(12, 4) datatype."""
+    data = [[Decimal('1.0000')], [Decimal('1000.0000')], [Decimal('1000000.0000')]]
+    headers = ['h1']
+    result_data, result_headers = format_numbers(data,
+                                                 headers,
+                                                 column_types=(float,),
+                                                 integer_format=',',
+                                                 float_format=',')
+
+    expected = [['1.0000'], ['1,000.0000'], ['1,000,000.0000']]
+    assert expected == list(result_data)
+    assert headers == result_headers
+
+
+def test_format_float():
+    """Test formatting for a REAL datatype."""
+    data = [[1.0], [1000.0], [1000000.0]]
+    headers = ['h1']
+    result_data, result_headers = format_numbers(data,
+                                                 headers,
+                                                 column_types=(float,),
+                                                 integer_format=',',
+                                                 float_format=',')
+    expected = [['1.0'], ['1,000.0'], ['1,000,000.0']]
+    assert expected == list(result_data)
+    assert headers == result_headers
+
+
+def test_format_integer_only():
+    """Test that providing one format string works."""
+    data = [[1, 1.0], [1000, 1000.0], [1000000, 1000000.0]]
+    headers = ['h1', 'h2']
+    result_data, result_headers = format_numbers(data, headers, column_types=(int, float),
+                                                 integer_format=',')
+
+    expected = [['1', 1.0], ['1,000', 1000.0], ['1,000,000', 1000000.0]]
+    assert expected == list(result_data)
+    assert headers == result_headers
+
+
+def test_format_numbers_no_format_strings():
+    """Test that numbers aren't formatted without format strings."""
+    data = ((1), (1000), (1000000))
+    headers = ('h1',)
+    result_data, result_headers = format_numbers(data, headers, column_types=(int,))
+    assert list(data) == list(result_data)
+    assert headers == result_headers
+
+
+def test_format_numbers_no_column_types():
+    """Test that numbers aren't formatted without column types."""
+    data = ((1), (1000), (1000000))
+    headers = ('h1',)
+    result_data, result_headers = format_numbers(data, headers, integer_format=',',
+                                  float_format=',')
+    assert list(data) == list(result_data)
+    assert headers == result_headers
+
+def test_enforce_iterable():
+    preprocessors = inspect.getmembers(cli_helpers.tabular_output.preprocessors, inspect.isfunction)
+    loremipsum = 'lorem ipsum dolor sit amet consectetur adipiscing elit sed do eiusmod'.split(' ')
+    for name, preprocessor in preprocessors:
+        preprocessed = preprocessor(zip(loremipsum), ['lorem'], column_types=(str,))
+        try:
+            first = next(preprocessed[0])
+        except StopIteration:
+            assert False, "{} gives no output with iterator data".format(name)
+        except TypeError:
+            assert False, "{} doesn't return iterable".format(name)
+        if isinstance(preprocessed[1], types.GeneratorType):
+            assert False, "{} returns headers as iterator".format(name)
diff --git a/tests/tabular_output/test_tabulate_adapter.py b/tests/tabular_output/test_tabulate_adapter.py
new file mode 100644
index 0000000..e0dd5a8
--- /dev/null
+++ b/tests/tabular_output/test_tabulate_adapter.py
@@ -0,0 +1,96 @@
+# -*- coding: utf-8 -*-
+"""Test the tabulate output adapter."""
+
+from __future__ import unicode_literals
+from textwrap import dedent
+
+import pytest
+
+from cli_helpers.compat import HAS_PYGMENTS
+from cli_helpers.tabular_output import tabulate_adapter
+
+if HAS_PYGMENTS:
+    from pygments.style import Style
+    from pygments.token import Token
+
+
+def test_tabulate_wrapper():
+    """Test the *output_formatter.tabulate_wrapper()* function."""
+    data = [['abc', 1], ['d', 456]]
+    headers = ['letters', 'number']
+    output = tabulate_adapter.adapter(iter(data), headers, table_format='psql')
+    assert "\n".join(output) == dedent('''\
+        +-----------+----------+
+        | letters   |   number |
+        |-----------+----------|
+        | abc       |        1 |
+        | d         |      456 |
+        +-----------+----------+''')
+
+    data = [['{1,2,3}', '{{1,2},{3,4}}', '{å,魚,текст}'], ['{}', '<null>', '{<null>}']]
+    headers = ['bigint_array', 'nested_numeric_array', '配列']
+    output = tabulate_adapter.adapter(iter(data), headers, table_format='psql')
+    assert "\n".join(output) == dedent('''\
+        +----------------+------------------------+--------------+
+        | bigint_array   | nested_numeric_array   | 配列         |
+        |----------------+------------------------+--------------|
+        | {1,2,3}        | {{1,2},{3,4}}          | {å,魚,текст} |
+        | {}             | <null>                 | {<null>}     |
+        +----------------+------------------------+--------------+''')
+
+
+def test_markup_format():
+    """Test that markup formats do not have number align or string align."""
+    data = [['abc', 1], ['d', 456]]
+    headers = ['letters', 'number']
+    output = tabulate_adapter.adapter(iter(data), headers, table_format='mediawiki')
+    assert "\n".join(output) == dedent('''\
+        {| class="wikitable" style="text-align: left;"
+        |+ <!-- caption -->
+        |-
+        ! letters !! number
+        |-
+        | abc || 1
+        |-
+        | d || 456
+        |}''')
+
+
+@pytest.mark.skipif(not HAS_PYGMENTS, reason='requires the Pygments library')
+def test_style_output_table():
+    """Test that *style_output_table()* styles the output table."""
+
+    class CliStyle(Style):
+        default_style = ""
+        styles = {
+            Token.Output.TableSeparator: 'ansibrightred',
+        }
+    headers = ['h1', 'h2']
+    data = [['观音', '2'], ['Ποσειδῶν', 'b']]
+    style_output_table = tabulate_adapter.style_output_table('psql')
+
+    style_output_table(data, headers, style=CliStyle)
+    output = tabulate_adapter.adapter(iter(data), headers, table_format='psql')
+
+    assert "\n".join(output) == dedent('''\
+        \x1b[91m+\x1b[39m''' + (
+          ('\x1b[91m-\x1b[39m' * 10) +
+          '\x1b[91m+\x1b[39m' +
+          ('\x1b[91m-\x1b[39m' * 6)) +
+        '''\x1b[91m+\x1b[39m
+        \x1b[91m|\x1b[39m h1       \x1b[91m|\x1b[39m''' +
+        ''' h2   \x1b[91m|\x1b[39m
+        ''' + '\x1b[91m|\x1b[39m' + (
+          ('\x1b[91m-\x1b[39m' * 10) +
+          '\x1b[91m+\x1b[39m' +
+          ('\x1b[91m-\x1b[39m' * 6)) +
+        '''\x1b[91m|\x1b[39m
+        \x1b[91m|\x1b[39m 观音     \x1b[91m|\x1b[39m''' +
+        ''' 2    \x1b[91m|\x1b[39m
+        \x1b[91m|\x1b[39m Ποσειδῶν \x1b[91m|\x1b[39m''' +
+        ''' b    \x1b[91m|\x1b[39m
+        ''' + '\x1b[91m+\x1b[39m' + (
+          ('\x1b[91m-\x1b[39m' * 10) +
+          '\x1b[91m+\x1b[39m' +
+          ('\x1b[91m-\x1b[39m' * 6)) +
+        '\x1b[91m+\x1b[39m')
diff --git a/tests/tabular_output/test_terminaltables_adapter.py b/tests/tabular_output/test_terminaltables_adapter.py
new file mode 100644
index 0000000..f756327
--- /dev/null
+++ b/tests/tabular_output/test_terminaltables_adapter.py
@@ -0,0 +1,69 @@
+# -*- coding: utf-8 -*-
+"""Test the terminaltables output adapter."""
+
+from __future__ import unicode_literals
+from textwrap import dedent
+
+import pytest
+
+from cli_helpers.compat import HAS_PYGMENTS
+from cli_helpers.tabular_output import terminaltables_adapter
+
+if HAS_PYGMENTS:
+    from pygments.style import Style
+    from pygments.token import Token
+
+
+def test_terminal_tables_adapter():
+    """Test the terminaltables output adapter."""
+    data = [['abc', 1], ['d', 456]]
+    headers = ['letters', 'number']
+    output = terminaltables_adapter.adapter(
+        iter(data), headers, table_format='ascii')
+    assert "\n".join(output) == dedent('''\
+        +---------+--------+
+        | letters | number |
+        +---------+--------+
+        | abc     | 1      |
+        | d       | 456    |
+        +---------+--------+''')
+
+
+@pytest.mark.skipif(not HAS_PYGMENTS, reason='requires the Pygments library')
+def test_style_output_table():
+    """Test that *style_output_table()* styles the output table."""
+
+    class CliStyle(Style):
+        default_style = ""
+        styles = {
+            Token.Output.TableSeparator: 'ansibrightred',
+        }
+    headers = ['h1', 'h2']
+    data = [['观音', '2'], ['Ποσειδῶν', 'b']]
+    style_output_table = terminaltables_adapter.style_output_table('ascii')
+
+    style_output_table(data, headers, style=CliStyle)
+    output = terminaltables_adapter.adapter(iter(data), headers, table_format='ascii')
+
+    assert "\n".join(output) == dedent('''\
+        \x1b[91m+\x1b[39m''' + (
+          ('\x1b[91m-\x1b[39m' * 10) +
+          '\x1b[91m+\x1b[39m' +
+          ('\x1b[91m-\x1b[39m' * 4)) +
+        '''\x1b[91m+\x1b[39m
+        \x1b[91m|\x1b[39m h1       \x1b[91m|\x1b[39m''' +
+        ''' h2 \x1b[91m|\x1b[39m
+        ''' + '\x1b[91m+\x1b[39m' + (
+          ('\x1b[91m-\x1b[39m' * 10) +
+          '\x1b[91m+\x1b[39m' +
+          ('\x1b[91m-\x1b[39m' * 4)) +
+        '''\x1b[91m+\x1b[39m
+        \x1b[91m|\x1b[39m 观音     \x1b[91m|\x1b[39m''' +
+        ''' 2  \x1b[91m|\x1b[39m
+        \x1b[91m|\x1b[39m Ποσειδῶν \x1b[91m|\x1b[39m''' +
+        ''' b  \x1b[91m|\x1b[39m
+        ''' + '\x1b[91m+\x1b[39m' + (
+          ('\x1b[91m-\x1b[39m' * 10) +
+          '\x1b[91m+\x1b[39m' +
+          ('\x1b[91m-\x1b[39m' * 4)) +
+        '\x1b[91m+\x1b[39m')
diff --git a/tests/tabular_output/test_tsv_output_adapter.py b/tests/tabular_output/test_tsv_output_adapter.py
new file mode 100644
index 0000000..707d757
--- /dev/null
+++ b/tests/tabular_output/test_tsv_output_adapter.py
@@ -0,0 +1,33 @@
+# -*- coding: utf-8 -*-
+"""Test the tsv delimited output adapter."""
+
+from __future__ import unicode_literals
+from textwrap import dedent
+
+import pytest
+
+from cli_helpers.tabular_output import tsv_output_adapter
+
+
+def test_tsv_wrapper():
+    """Test the tsv output adapter."""
+    # Test tab-delimited output.
+    data = [['ab\r\nc', '1'], ['d', '456']]
+    headers = ['letters', 'number']
+    output = tsv_output_adapter.adapter(
+        iter(data), headers, table_format='tsv')
+    assert "\n".join(output) == dedent('''\
+        letters\tnumber\n\
+        ab\r\\nc\t1\n\
+        d\t456''')
+
+
+def test_unicode_with_tsv():
+    """Test that the tsv wrapper can handle non-ascii characters."""
+    data = [['观音', '1'], ['Ποσειδῶν', '456']]
+    headers = ['letters', 'number']
+    output = tsv_output_adapter.adapter(data, headers)
+    assert "\n".join(output) == dedent('''\
+        letters\tnumber\n\
+        观音\t1\n\
+        Ποσειδῶν\t456''')
diff --git a/tests/tabular_output/test_vertical_table_adapter.py b/tests/tabular_output/test_vertical_table_adapter.py
new file mode 100644
index 0000000..8b5e18c
--- /dev/null
+++ b/tests/tabular_output/test_vertical_table_adapter.py
@@ -0,0 +1,38 @@
+# -*- coding: utf-8 -*-
+"""Test the vertical table formatter."""
+
+from textwrap import dedent
+
+from cli_helpers.compat import text_type
+from cli_helpers.tabular_output import vertical_table_adapter
+
+
+def test_vertical_table():
+    """Test the default settings for vertical_table()."""
+    results = [('hello', text_type(123)), ('world', text_type(456))]
+
+    expected = dedent("""\
+        ***************************[ 1. row ]***************************
+        name | hello
+        age  | 123
+        ***************************[ 2. row ]***************************
+        name | world
+        age  | 456""")
+    assert expected == "\n".join(
+        vertical_table_adapter.adapter(results, ('name', 'age')))
+
+
+def test_vertical_table_customized():
+    """Test customized settings for vertical_table()."""
+    results = [('john', text_type(47)), ('jill', text_type(50))]
+
+    expected = dedent("""\
+        -[ PERSON 1 ]-----
+        name | john
+        age  | 47
+        -[ PERSON 2 ]-----
+        name | jill
+        age  | 50""")
+    assert expected == "\n".join(vertical_table_adapter.adapter(
+        results, ('name', 'age'), sep_title='PERSON {n}',
+        sep_character='-', sep_length=(1, 5)))
diff --git a/tests/test_cli_helpers.py b/tests/test_cli_helpers.py
new file mode 100644
index 0000000..50b8c81
--- /dev/null
+++ b/tests/test_cli_helpers.py
@@ -0,0 +1,5 @@
+import cli_helpers
+
+
+def test_cli_helpers():
+    assert True
diff --git a/tests/test_config.py b/tests/test_config.py
new file mode 100644
index 0000000..035e311
--- /dev/null
+++ b/tests/test_config.py
@@ -0,0 +1,271 @@
+# -*- coding: utf-8 -*-
+"""Test the cli_helpers.config module."""
+
+from __future__ import unicode_literals
+import os
+
+from unittest.mock import MagicMock
+import pytest
+
+from cli_helpers.compat import MAC, text_type, WIN
+from cli_helpers.config import (Config, DefaultConfigValidationError,
+                                get_system_config_dirs, get_user_config_dir,
+                                _pathify)
+from .utils import with_temp_dir
+
+APP_NAME, APP_AUTHOR = 'Test', 'Acme'
+TEST_DATA_DIR = os.path.join(os.path.dirname(__file__), 'config_data')
+DEFAULT_CONFIG = {
+    'section':  {
+        'test_boolean_default': 'True',
+        'test_string_file': '~/myfile',
+        'test_option': 'foobar'
+    },
+    'section2': {}
+}
+DEFAULT_VALID_CONFIG = {
+    'section':  {
+        'test_boolean_default': True,
+        'test_string_file': '~/myfile',
+        'test_option': 'foobar'
+    },
+    'section2': {}
+}
+
+
+def _mocked_user_config(temp_dir, *args, **kwargs):
+    config = Config(*args, **kwargs)
+    config.user_config_file = MagicMock(return_value=os.path.join(
+        temp_dir, config.filename))
+    return config
+
+
+def test_user_config_dir():
+    """Test that the config directory is a string with the app name in it."""
+    if 'XDG_CONFIG_HOME' in os.environ:
+        del os.environ['XDG_CONFIG_HOME']
+    config_dir = get_user_config_dir(APP_NAME, APP_AUTHOR)
+    assert isinstance(config_dir, text_type)
+    assert (config_dir.endswith(APP_NAME) or
+            config_dir.endswith(_pathify(APP_NAME)))
+
+
+def test_sys_config_dirs():
+    """Test that the sys config directories are returned correctly."""
+    if 'XDG_CONFIG_DIRS' in os.environ:
+        del os.environ['XDG_CONFIG_DIRS']
+    config_dirs = get_system_config_dirs(APP_NAME, APP_AUTHOR)
+    assert isinstance(config_dirs, list)
+    assert (config_dirs[0].endswith(APP_NAME) or
+            config_dirs[0].endswith(_pathify(APP_NAME)))
+
+
+@pytest.mark.skipif(not WIN, reason="requires Windows")
+def test_windows_user_config_dir_no_roaming():
+    """Test that Windows returns the user config directory without roaming."""
+    config_dir = get_user_config_dir(APP_NAME, APP_AUTHOR, roaming=False)
+    assert isinstance(config_dir, text_type)
+    assert config_dir.endswith(APP_NAME)
+    assert 'Local' in config_dir
+
+
+@pytest.mark.skipif(not MAC, reason="requires macOS")
+def test_mac_user_config_dir_no_xdg():
+    """Test that macOS returns the user config directory without XDG."""
+    config_dir = get_user_config_dir(APP_NAME, APP_AUTHOR, force_xdg=False)
+    assert isinstance(config_dir, text_type)
+    assert config_dir.endswith(APP_NAME)
+    assert 'Library' in config_dir
+
+
+@pytest.mark.skipif(not MAC, reason="requires macOS")
+def test_mac_system_config_dirs_no_xdg():
+    """Test that macOS returns the system config directories without XDG."""
+    config_dirs = get_system_config_dirs(APP_NAME, APP_AUTHOR, force_xdg=False)
+    assert isinstance(config_dirs, list)
+    assert config_dirs[0].endswith(APP_NAME)
+    assert 'Library' in config_dirs[0]
+
+
+def test_config_reading_raise_errors():
+    """Test that instantiating Config will raise errors when appropriate."""
+    with pytest.raises(ValueError):
+        Config(APP_NAME, APP_AUTHOR, 'test_config', write_default=True)
+
+    with pytest.raises(ValueError):
+        Config(APP_NAME, APP_AUTHOR, 'test_config', validate=True)
+
+    with pytest.raises(TypeError):
+        Config(APP_NAME, APP_AUTHOR, 'test_config', default=b'test')
+
+
+def test_config_user_file():
+    """Test that the Config user_config_file is appropriate."""
+    config = Config(APP_NAME, APP_AUTHOR, 'test_config')
+    assert (get_user_config_dir(APP_NAME, APP_AUTHOR) in
+            config.user_config_file())
+
+
+def test_config_reading_default_dict():
+    """Test that the Config constructor will read in defaults from a dict."""
+    default = {'main': {'foo': 'bar'}}
+    config = Config(APP_NAME, APP_AUTHOR, 'test_config', default=default)
+    assert config.data == default
+
+
+def test_config_reading_no_default():
+    """Test that the Config constructor will work without any defaults."""
+    config = Config(APP_NAME, APP_AUTHOR, 'test_config')
+    assert config.data == {}
+
+
+def test_config_reading_default_file():
+    """Test that the Config will work with a default file."""
+    config = Config(APP_NAME, APP_AUTHOR, 'test_config',
+                    default=os.path.join(TEST_DATA_DIR, 'configrc'))
+    config.read_default_config()
+    assert config.data == DEFAULT_CONFIG
+
+
+def test_config_reading_configspec():
+    """Test that the Config default file will work with a configspec."""
+    config = Config(APP_NAME, APP_AUTHOR, 'test_config', validate=True,
+                    default=os.path.join(TEST_DATA_DIR, 'configspecrc'))
+    config.read_default_config()
+    assert config.data == DEFAULT_VALID_CONFIG
+
+
+def test_config_reading_configspec_with_error():
+    """Test that reading an invalid configspec raises and exception."""
+    with pytest.raises(DefaultConfigValidationError):
+        config = Config(APP_NAME, APP_AUTHOR, 'test_config', validate=True,
+                        default=os.path.join(TEST_DATA_DIR,
+                                             'invalid_configspecrc'))
+        config.read_default_config()
+
+
+@with_temp_dir
+def test_write_and_read_default_config(temp_dir=None):
+    config_file = 'test_config'
+    default_file = os.path.join(TEST_DATA_DIR, 'configrc')
+    temp_config_file = os.path.join(temp_dir, config_file)
+
+    config = _mocked_user_config(temp_dir, APP_NAME, APP_AUTHOR, config_file,
+                                 default=default_file)
+    config.read_default_config()
+    config.write_default_config()
+
+    user_config = _mocked_user_config(temp_dir, APP_NAME, APP_AUTHOR,
+                                      config_file, default=default_file)
+    user_config.read()
+    assert temp_config_file in user_config.config_filenames
+    assert user_config == config
+
+    with open(temp_config_file) as f:
+        contents = f.read()
+    assert '# Test file comment' in contents
+    assert '# Test section comment' in contents
+    assert '# Test field comment' in contents
+    assert '# Test field commented out' in contents
+
+
+@with_temp_dir
+def test_write_and_read_default_config_from_configspec(temp_dir=None):
+    config_file = 'test_config'
+    default_file = os.path.join(TEST_DATA_DIR, 'configspecrc')
+    temp_config_file = os.path.join(temp_dir, config_file)
+
+    config = _mocked_user_config(temp_dir, APP_NAME, APP_AUTHOR, config_file,
+                                 default=default_file, validate=True)
+    config.read_default_config()
+    config.write_default_config()
+
+    user_config = _mocked_user_config(temp_dir, APP_NAME, APP_AUTHOR,
+                                      config_file, default=default_file,
+                                      validate=True)
+    user_config.read()
+    assert temp_config_file in user_config.config_filenames
+    assert user_config == config
+
+    with open(temp_config_file) as f:
+        contents = f.read()
+    assert '# Test file comment' in contents
+    assert '# Test section comment' in contents
+    assert '# Test field comment' in contents
+    assert '# Test field commented out' in contents
+
+
+@with_temp_dir
+def test_overwrite_default_config_from_configspec(temp_dir=None):
+    config_file = 'test_config'
+    default_file = os.path.join(TEST_DATA_DIR, 'configspecrc')
+    temp_config_file = os.path.join(temp_dir, config_file)
+
+    config = _mocked_user_config(temp_dir, APP_NAME, APP_AUTHOR, config_file,
+                                 default=default_file, validate=True)
+    config.read_default_config()
+    config.write_default_config()
+
+    with open(temp_config_file, 'a') as f:
+        f.write('--APPEND--')
+
+    config.write_default_config()
+
+    with open(temp_config_file) as f:
+        assert '--APPEND--' in f.read()
+
+    config.write_default_config(overwrite=True)
+
+    with open(temp_config_file) as f:
+        assert '--APPEND--' not in f.read()
+
+
+def test_read_invalid_config_file():
+    config_file = 'invalid_configrc'
+
+    config = _mocked_user_config(TEST_DATA_DIR, APP_NAME, APP_AUTHOR,
+                                 config_file)
+    config.read()
+    assert 'section' in config
+    assert 'test_string_file' in config['section']
+    assert 'test_boolean_default' not in config['section']
+    assert 'section2' in config
+
+
+@with_temp_dir
+def test_write_to_user_config(temp_dir=None):
+    config_file = 'test_config'
+    default_file = os.path.join(TEST_DATA_DIR, 'configrc')
+    temp_config_file = os.path.join(temp_dir, config_file)
+
+    config = _mocked_user_config(temp_dir, APP_NAME, APP_AUTHOR, config_file,
+                                 default=default_file)
+    config.read_default_config()
+    config.write_default_config()
+
+    with open(temp_config_file) as f:
+        assert 'test_boolean_default = True' in f.read()
+
+    config['section']['test_boolean_default'] = False
+    config.write()
+
+    with open(temp_config_file) as f:
+        assert 'test_boolean_default = False' in f.read()
+
+
+@with_temp_dir
+def test_write_to_outfile(temp_dir=None):
+    config_file = 'test_config'
+    outfile = os.path.join(temp_dir, 'foo')
+    default_file = os.path.join(TEST_DATA_DIR, 'configrc')
+
+    config = _mocked_user_config(temp_dir, APP_NAME, APP_AUTHOR, config_file,
+                                 default=default_file)
+    config.read_default_config()
+    config.write_default_config()
+
+    config['section']['test_boolean_default'] = False
+    config.write(outfile=outfile)
+
+    with open(outfile) as f:
+        assert 'test_boolean_default = False' in f.read()
diff --git a/tests/test_utils.py b/tests/test_utils.py
new file mode 100644
index 0000000..a136d02
--- /dev/null
+++ b/tests/test_utils.py
@@ -0,0 +1,70 @@
+# -*- coding: utf-8 -*-
+"""Test CLI Helpers' utility functions and helpers."""
+
+from __future__ import unicode_literals
+
+from cli_helpers import utils
+
+
+def test_bytes_to_string_hexlify():
+    """Test that bytes_to_string() hexlifies binary data."""
+    assert utils.bytes_to_string(b'\xff') == '0xff'
+
+
+def test_bytes_to_string_decode_bytes():
+    """Test that bytes_to_string() decodes bytes."""
+    assert utils.bytes_to_string(b'foobar') == 'foobar'
+
+
+def test_bytes_to_string_non_bytes():
+    """Test that bytes_to_string() returns non-bytes untouched."""
+    assert utils.bytes_to_string('abc') == 'abc'
+    assert utils.bytes_to_string(1) == 1
+
+
+def test_to_string_bytes():
+    """Test that to_string() converts bytes to a string."""
+    assert utils.to_string(b"foo") == 'foo'
+
+
+def test_to_string_non_bytes():
+    """Test that to_string() converts non-bytes to a string."""
+    assert utils.to_string(1) == '1'
+    assert utils.to_string(2.29) == '2.29'
+
+
+def test_truncate_string():
+    """Test string truncate preprocessor."""
+    val = 'x' * 100
+    assert utils.truncate_string(val, 10) == 'xxxxxxx...'
+    
+    val = 'x ' * 100
+    assert utils.truncate_string(val, 10) == 'x x x x...'
+
+    val = 'x' * 100
+    assert utils.truncate_string(val) == 'x' * 100
+
+    val = ['x'] * 100
+    val[20] = '\n'
+    str_val = ''.join(val)
+    assert utils.truncate_string(str_val, 10, skip_multiline_string=True) == str_val
+
+
+def test_intlen_with_decimal():
+    """Test that intlen() counts correctly with a decimal place."""
+    assert utils.intlen('11.1') == 2
+    assert utils.intlen('1.1') == 1
+
+
+def test_intlen_without_decimal():
+    """Test that intlen() counts correctly without a decimal place."""
+    assert utils.intlen('11') == 2
+
+
+def test_filter_dict_by_key():
+    """Test that filter_dict_by_key() filter unwanted items."""
+    keys = ('foo', 'bar')
+    d = {'foo': 1, 'foobar': 2}
+    fd = utils.filter_dict_by_key(d, keys)
+    assert len(fd) == 1
+    assert all([k in keys for k in fd])
diff --git a/tests/utils.py b/tests/utils.py
new file mode 100644
index 0000000..df62e01
--- /dev/null
+++ b/tests/utils.py
@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+"""Utility functions for CLI Helpers' tests."""
+
+from __future__ import unicode_literals
+from functools import wraps
+
+from .compat import TemporaryDirectory
+
+
+def with_temp_dir(f):
+    """A wrapper that creates and deletes a temporary directory."""
+    @wraps(f)
+    def wrapped(*args, **kwargs):
+        with TemporaryDirectory() as temp_dir:
+            return f(*args, temp_dir=temp_dir, **kwargs)
+    return wrapped