Add basic install tests

tests/samples/package1-pkg.ini

@@ -2,3 +2,6 @@
 author=Sir Robin
 author-email=robin@camelot.uk
 home-page=http://github.com/sirrobin/package1
+
+[scripts]
+pkg_script=package1:main

tests/samples/package1/__init__.py

@@ -1,3 +1,6 @@
 """A sample package"""
 
 __version__ = '0.1'
+
+def main():
+    print("package1 main")

tests/test_install.py

@@ -0,0 +1,54 @@
+import os
+import pathlib
+import tempfile
+from unittest import TestCase
+from unittest.mock import patch
+
+from testpath import assert_isfile, assert_isdir, assert_islink
+
+from flit import Importable
+from flit.install import Installer
+
+class InstallTests(TestCase):
+    def setUp(self):
+        self.orig_working_dir = os.getcwd()
+        samples_dir = os.path.join(os.path.dirname(__file__), 'samples')
+        os.chdir(samples_dir)
+
+        td = tempfile.TemporaryDirectory()
+        scripts_dir = os.path.join(td.name, 'scripts')
+        os.mkdir(scripts_dir)
+        purelib_dir = os.path.join(td.name, 'site-packages')
+        os.mkdir(purelib_dir)
+        self.addCleanup(td.cleanup)
+        self.get_dirs_patch = patch('flit.install.get_dirs',
+                return_value={'scripts': scripts_dir, 'purelib': purelib_dir})
+        self.get_dirs_patch.start()
+        self.tmpdir = pathlib.Path(td.name)
+
+    def tearDown(self):
+        self.get_dirs_patch.stop()
+        os.chdir(self.orig_working_dir)
+
+    def test_install_module(self):
+        i = Importable('module1')
+        i.check()
+        Installer(i).install()
+        assert_isfile(str(self.tmpdir / 'site-packages' / 'module1.py'))
+        assert_isdir(str(self.tmpdir / 'site-packages' / 'module1-0.1.egg-info'))
+
+    def test_install_package(self):
+        i = Importable('package1')
+        i.check()
+        Installer(i).install()
+        assert_isdir(str(self.tmpdir / 'site-packages' / 'package1'))
+        assert_isdir(str(self.tmpdir / 'site-packages' / 'package1-0.1.egg-info'))
+        assert_isfile(str(self.tmpdir / 'scripts' / 'pkg_script'))
+
+    def test_symlink_package(self):
+        i = Importable('package1')
+        i.check()
+        Installer(i, symlink=True).install()
+        assert_islink(str(self.tmpdir / 'site-packages' / 'package1'),
+                      to=str(i.path.resolve()))
+        assert_isfile(str(self.tmpdir / 'scripts' / 'pkg_script'))

tests/test_wheel.py

@@ -5,7 +5,7 @@
 
 from flit import Importable, wheel
 
-class ImportableTests(TestCase):
+class WheelTests(TestCase):
     def setUp(self):
         self.orig_working_dir = os.getcwd()
         samples_dir = os.path.join(os.path.dirname(__file__), 'samples')