diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 7b3f9b0..a41d88b 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -29,12 +29,13 @@
         language_version: python3.5
     -   id: fix-encoding-pragma
         language_version: python3.5
+        args: ['--remove']
 -   repo: https://github.com/asottile/reorder_python_imports
     sha: v0.3.1
     hooks:
     -   id: reorder-python-imports
         language_version: python3.5
         args: [
-            '--add-import', 'from __future__ import absolute_import',
-            '--add-import', 'from __future__ import unicode_literals',
+            '--remove-import', 'from __future__ import absolute_import',
+            '--remove-import', 'from __future__ import unicode_literals',
         ]
diff --git a/lazy_build/cache.py b/lazy_build/cache.py
index 01c84ce..27124d9 100644
--- a/lazy_build/cache.py
+++ b/lazy_build/cache.py
@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import
-from __future__ import unicode_literals
-
 import collections
 import os
 import tempfile
diff --git a/lazy_build/cli.py b/lazy_build/cli.py
index 3de773a..8148c3c 100644
--- a/lazy_build/cli.py
+++ b/lazy_build/cli.py
@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import
-from __future__ import unicode_literals
-
 import argparse
 import json
 import os
@@ -116,7 +112,7 @@ def main(argv=None):
     # TODO: is there a way we can get argparse to do this for us?
     if args.command[0] != '--':
         raise ValueError(
-            'You must separate the command from the other arguments with a --!',
+            'You must separate the command from the other arguments with a --!',  # noqa
         )
 
     del args.command[0]
diff --git a/lazy_build/color.py b/lazy_build/color.py
index b28b4fd..7ae8a81 100644
--- a/lazy_build/color.py
+++ b/lazy_build/color.py
@@ -1,8 +1,4 @@
-# -*- coding: utf-8 -*-
 """Stolen from ocflib.misc.shell"""
-from __future__ import absolute_import
-from __future__ import unicode_literals
-
 import sys
 
 # terminal text color wrappers;
diff --git a/lazy_build/config.py b/lazy_build/config.py
index ec1adcb..c3454e1 100644
--- a/lazy_build/config.py
+++ b/lazy_build/config.py
@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import
-from __future__ import unicode_literals
-
 import collections
 
 from lazy_build import cache
diff --git a/lazy_build/context.py b/lazy_build/context.py
index cb05219..eadebb9 100644
--- a/lazy_build/context.py
+++ b/lazy_build/context.py
@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import
-from __future__ import unicode_literals
-
 import collections
 import fnmatch
 import hashlib
@@ -90,8 +86,7 @@ def build_context(conf, command):
         if os.path.isdir(path) and not os.path.islink(path):
             for child in os.listdir(path):
                 child = os.path.relpath(os.path.join(path, child))
-                if child not in explored:
-                    fringe.add(child)
+                fringe.add(child)
         else:
             ctx[path] = FileContext.from_path(path)
 
diff --git a/setup.py b/setup.py
index 7b85f46..faa6c80 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import
-from __future__ import unicode_literals
-
 from setuptools import find_packages
 from setuptools import setup
 
@@ -10,8 +6,6 @@
     name='lazy-build',
     version='0.0.0.dev1',
     classifiers=[
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.5',
     ],
diff --git a/tests/color_test.py b/tests/color_test.py
new file mode 100644
index 0000000..d2d3254
--- /dev/null
+++ b/tests/color_test.py
@@ -0,0 +1,41 @@
+import sys
+from unittest import mock
+
+import pytest
+
+import lazy_build.color
+
+
+COLORS = (
+    'black', 'red', 'green', 'yellow', 'blue', 'magenta', 'cyan', 'white',
+)
+
+
+@pytest.mark.parametrize('color', COLORS)
+def test_color_wrappers_with_tty(color):
+    with mock.patch.object(sys.stdout, 'isatty', return_value=True):
+        fore = getattr(lazy_build.color, color)
+        assert fore('hi') == fore('hi', tty_only=True)
+        assert fore('hi') == (
+            lazy_build.color.FG_CODES[color] +
+            'hi' +
+            lazy_build.color.FG_CODES['reset']
+        )
+
+        bg = getattr(lazy_build.color, 'bg_' + color)
+        assert bg('hi') == bg('hi', tty_only=True)
+        assert bg('hi') == (
+            lazy_build.color.BG_CODES[color] +
+            'hi' +
+            lazy_build.color.BG_CODES['reset']
+        )
+
+
+@pytest.mark.parametrize('color', COLORS)
+def test_color_wrappers_without_tty(color):
+    with mock.patch('sys.stdout.isatty', return_value=False):
+        fore = getattr(lazy_build.color, color)
+        assert fore('hi') == 'hi'
+
+        bg = getattr(lazy_build.color, 'bg_' + color)
+        assert bg('hi') == 'hi'
diff --git a/tests/config_test.py b/tests/config_test.py
new file mode 100644
index 0000000..9496795
--- /dev/null
+++ b/tests/config_test.py
@@ -0,0 +1,15 @@
+from unittest import mock
+
+from lazy_build import config
+
+
+def test_from_args():
+    conf = config.Config.from_args(mock.Mock(
+        context=['requirements.txt', 'setup.py'],
+        ignore=['*.py[co]', '*.swp'],
+        output=['venv', 'node_modules'],
+    ))
+    assert conf.context == {'requirements.txt', 'setup.py'}
+    assert conf.ignore == {'*.py[co]', '*.swp'}
+    assert conf.output == {'venv', 'node_modules'}
+    # TODO: make some assertions about the backend
diff --git a/tests/context_test.py b/tests/context_test.py
index f49bb67..e40f03c 100644
--- a/tests/context_test.py
+++ b/tests/context_test.py
@@ -1,6 +1,7 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import
-from __future__ import unicode_literals
+import io
+import json
+import os
+import tarfile
 
 import pytest
 
@@ -35,7 +36,7 @@ def test_build_context_simple(tmpdir):
     conf = config.Config(
         context={tmpdir.strpath, tmpdir.join('a').strpath},
         ignore={'d'},
-        output=('output',),
+        output=None,
         backend=None,
     )
     tmpdir.join('a').write(b'foo')
@@ -44,7 +45,9 @@ def test_build_context_simple(tmpdir):
     tmpdir.join('d').mkdir()
     tmpdir.join('d/e').write(b'baz')
     tmpdir.join('f').mksymlinkto('/etc/passwd')
-    assert context.build_context(conf, 'command') == context.BuildContext(
+
+    ctx = context.build_context(conf, 'command')
+    assert ctx == context.BuildContext(
         files={
             'a': context.FileContext('file', context.hash(b'foo')),
             'b/c': context.FileContext('file', context.hash(b'bar')),
@@ -52,3 +55,58 @@ def test_build_context_simple(tmpdir):
         },
         command='command',
     )
+    assert ctx.hash == context.hash(
+        json.dumps(('command', ctx.files), sort_keys=True).encode('utf8'),
+    )
+
+
+def test_package_artifact(tmpdir):
+    tmpdir.chdir()
+    tmpdir.join('a').ensure()
+    tmpdir.join('b').mkdir()
+    tmpdir.join('b/c').ensure()
+    tmpdir.join('c').ensure()
+
+    tmp = context.package_artifact(config.Config(
+        context=None,
+        ignore=None,
+        output=('b', 'c'),
+        backend=None,
+    ))
+    try:
+        with tarfile.TarFile(tmp) as tf:
+            members = {member.name for member in tf.getmembers()}
+    finally:
+        os.remove(tmp)
+
+    assert members == {'b/c', 'c'}
+
+
+def test_extract_artifact(tmpdir):
+    tmpdir.chdir()
+    tmpdir.join('my.txt').write('this is not the text you are looking for')
+    tmpdir.join('a').mkdir()
+    tmpdir.join('a/b').mkdir()
+    tmpdir.join('a/sup').ensure()
+    tmpdir.join('a/b/sup').ensure()
+
+    tar = tmpdir.join('my.tar').strpath
+    with tarfile.TarFile(tar, 'w') as tf:
+        for path in ('my.txt', 'hello/there.txt', 'a/b/c/d.txt'):
+            ti = tarfile.TarInfo(path)
+            ti.size = 6
+            tf.addfile(ti, fileobj=io.BytesIO(b'wuddup'))
+
+    context.extract_artifact(config.Config(
+        context=None,
+        ignore=None,
+        output=('my.txt', 'hello', 'a/b'),
+        backend=None,
+    ), tar)
+
+    assert tmpdir.join('my.txt').read() == 'wuddup'
+    assert tmpdir.join('hello/there.txt').isfile()
+    assert tmpdir.join('a/b/c/d.txt').isfile()
+
+    assert tmpdir.join('a/sup').isfile()
+    assert not tmpdir.join('a/b/sup').isfile()
diff --git a/tox.ini b/tox.ini
index 1c83eba..7e6586c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py35
+envlist = py35
 
 [testenv]
 deps = -rrequirements-dev.txt
@@ -22,7 +22,7 @@ deps =
 commands =
 
 [flake8]
-max-line-length = 119
+max-line-length = 79
 
 [pep8]
 ignore = E265,E309,E501