--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_processing_base.py	Wed Aug 20 21:46:27 2014 -0700
@@ -0,0 +1,61 @@
+import pytest
+from piecrust.processing.base import ProcessorPipeline
+from .mockutil import mock_fs, mock_fs_scope
+
+
+def _get_pipeline(fs, **kwargs):
+    return ProcessorPipeline(fs.getApp(), fs.path('counter'),
+            num_workers=1, **kwargs)
+
+def test_empty():
+    fs = mock_fs()
+    with mock_fs_scope(fs):
+        pp = _get_pipeline(fs)
+        pp.filterProcessors(['copy'])
+        expected = {}
+        assert expected == fs.getStructure('counter')
+        pp.run()
+        expected = {}
+        assert expected == fs.getStructure('counter')
+
+
+def test_one_file():
+    fs = (mock_fs()
+            .withFile('kitchen/something.html', 'A test file.'))
+    with mock_fs_scope(fs):
+        pp = _get_pipeline(fs)
+        pp.filterProcessors(['copy'])
+        expected = {}
+        assert expected == fs.getStructure('counter')
+        pp.run()
+        expected = {'something.html': 'A test file.'}
+        assert expected == fs.getStructure('counter')
+
+
+@pytest.mark.parametrize('patterns, expected', [
+        (['_'],
+            {'something.html': 'A test file.'}),
+        (['html'],
+            {}),
+        (['/^_/'],
+            {'something.html': 'A test file.',
+                'foo': {'_important.html': 'Important!'}})
+        ])
+def test_skip_pattern(patterns, expected):
+    fs = (mock_fs()
+            .withFile('kitchen/something.html', 'A test file.')
+            .withFile('kitchen/_hidden.html', 'Shhh')
+            .withFile('kitchen/foo/_important.html', 'Important!'))
+    with mock_fs_scope(fs):
+        pp = _get_pipeline(fs, skip_patterns=['/^_/'])
+        pp.filterProcessors(['copy'])
+        expected = {}
+        assert expected == fs.getStructure('counter')
+        pp.run()
+        expected = {
+                'something.html': 'A test file.',
+                'foo': {
+                    '_important.html': 'Important!'}
+                }
+        assert expected == fs.getStructure('counter')
+