Add smoketests for wheel building

.gitignore

@@ -2,3 +2,5 @@
 /dist/
 __pycache__/
 /doc/_build/
+/tests/samples/build/
+/tests/samples/dist/

tests/test_wheel.py

@@ -0,0 +1,27 @@
+import os
+from unittest import TestCase
+
+from testpath import assert_isfile
+
+from flit import Importable, wheel
+
+class ImportableTests(TestCase):
+    def setUp(self):
+        self.orig_working_dir = os.getcwd()
+        samples_dir = os.path.join(os.path.dirname(__file__), 'samples')
+        os.chdir(samples_dir)
+
+    def tearDown(self):
+        os.chdir(self.orig_working_dir)
+
+    def test_wheel_module(self):
+        i = Importable('module1')
+        i.check()
+        wheel(i)
+        assert_isfile('dist/module1-0.1-py2.py3-none-any.whl')
+
+    def test_wheel_package(self):
+        i = Importable('package1')
+        i.check()
+        wheel(i)
+        assert_isfile('dist/package1-0.1-py2.py3-none-any.whl')