wrote tests for bin

setup.py

@@ -19,7 +19,7 @@
 ]
 
 setup(name='uranium',
-      version='0.0.49',
+      version='0.0.52',
       description='a build system for python',
       long_description='a build system for python',
       author='Yusuke Tsutsumi',

uranium/tests/test_plugin_api/test_bin.py

@@ -0,0 +1,20 @@
+import shutil
+import tempfile
+from nose.tools import ok_
+from uranium.bin import BinDirectory
+from uranium.config import Config
+from uranium.uranium import Uranium
+
+
+class TestBinEndpoint(object):
+
+    def setUp(self):
+        self.root = tempfile.mkdtemp()
+        self.config = Config({})
+        self.uranium = Uranium(self.config, root=self.root)
+
+    def tearDown(self):
+        shutil.rmtree(self.root)
+
+    def test_bin_lazyload(self):
+        ok_(isinstance(self.uranium.bin, BinDirectory))

uranium/uranium.py

@@ -51,8 +51,9 @@ def root(self):
 
     @property
     def bin(self):
-        if not self._bin:
-            self._bin = BinDirectory(self._root, BIN_DIRECTORY)
+        if not hasattr(self, '_bin'):
+            self._bin = BinDirectory(
+                os.path.join(self._root, BIN_DIRECTORY))
         return self._bin
 
     @property