Add ListFiles a function to recursively list files in a directory.

chromite/lib/cros_build_lib_unittest.py

Index: chromite/lib/cros_build_lib_unittest.py
diff --git a/chromite/lib/cros_build_lib_unittest.py b/chromite/lib/cros_build_lib_unittest.py
new file mode 100755
index 0000000000000000000000000000000000000000..ef6ee9e27ad0e1576df714a68bd05b533458c739
--- /dev/null
+++ b/chromite/lib/cros_build_lib_unittest.py
@@ -0,0 +1,69 @@
+#!/usr/bin/python
+
+import errno
+import os 
+import unittest 
+import shutil
+import tempfile 
+
+import cros_build_lib
+
+class TestListFiles(unittest.TestCase):
+
+  def setUp(self):
+    self.root_dir = tempfile.mkdtemp(prefix='listfiles_unittest')
+
+  def tearDown(self):
+    shutil.rmtree(self.root_dir)
+
+  def _createNestedDir(self, dir_structure):
+    for entry in dir_structure:
+      full_path = os.path.join(os.path.join(self.root_dir, entry))
+      # ensure dirs are created
+      try:
+        os.makedirs(os.path.dirname(full_path))
+        if full_path.endswith('/'):
+          # we only want to create directories
+          return
+      except OSError, err:
+        if err.errno == errno.EEXIST:
+          # we don't care if the dir already exists
+          pass
+        else:
+          raise
+      # create dummy files
+      tmp = open(full_path, 'w')
+      tmp.close()
+
+  def testTraverse(self):
+    """
+    Test that we are traversing the directory properly
+    """
+    dir_structure = ['one/two/test.txt', 'one/blah.py',
+                     'three/extra.conf']
+    self._createNestedDir(dir_structure)
+
+    files = cros_build_lib.ListFiles(self.root_dir)
+    for file in files:
+      file = file.replace(self.root_dir, '').lstrip('/')
+      if file not in dir_structure:
+        self.fail('%s was not found in %s' % (file, dir_structure))
+
+  def testEmptyFilePath(self):
+    """
+    Test that we return nothing when directories are empty
+    """
+    dir_structure = ['one/', 'two/', 'one/a/']
+    self._createNestedDir(dir_structure)
+    files = cros_build_lib.ListFiles(self.root_dir)
+    self.assertEqual(files, [])
+
+  def testNoSuchDir(self):
+    try:
+      cros_build_lib.ListFiles('/me/no/existe')
+    except OSError, err:
+      self.assertEqual(err.errno, errno.ENOENT)
+    
+
+if __name__ == '__main__':
+  unittest.main()