Start adding tests

tests/samples/module1-pkg.ini

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+[metadata]
+author=Sir Robin
+author-email=robin@camelot.uk
+home-page=http://github.com/sirrobin/module1

tests/samples/module1.py

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+"""Example module"""
+
+__version__ = '0.1'

tests/samples/package1-pkg.ini

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+[metadata]
+author=Sir Robin
+author-email=robin@camelot.uk
+home-page=http://github.com/sirrobin/package1

tests/samples/package1/__init__.py

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+"""A sample package"""
+
+__version__ = '0.1'

tests/samples/package1/foo.py

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+a = 1

tests/test_importable.py

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+import os
+from pathlib import Path
+from unittest import TestCase
+
+from flit import Importable
+
+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_package_importable(self):
+        i = Importable('package1')
+        i.check()
+        assert i.path == Path('package1')
+
+    def test_module_importable(self):
+        i = Importable('module1')
+        i.check()
+        assert i.path == Path('module1.py')
+
+    def test_missing_name(self):
+        with self.assertRaises(ValueError):
+            i = Importable('doesnt_exist')