[stdlib] Adds Update(...) and FixedWindow(...) the the standard nodes provided with bonobo.

tests/nodes/io/test_file.py

@@ -0,0 +1,50 @@
+import pytest
+
+from bonobo import Bag, FileReader, FileWriter
+from bonobo.constants import BEGIN, END
+from bonobo.execution.contexts.node import NodeExecutionContext
+from bonobo.util.testing import BufferingNodeExecutionContext, FilesystemTester
+
+txt_tester = FilesystemTester('txt')
+txt_tester.input_data = 'Hello\nWorld\n'
+
+
+def test_file_writer_contextless(tmpdir):
+    fs, filename, services = txt_tester.get_services_for_writer(tmpdir)
+
+    with FileWriter(path=filename).open(fs) as fp:
+        fp.write('Yosh!')
+
+    with fs.open(filename) as fp:
+        assert fp.read() == 'Yosh!'
+
+
+@pytest.mark.parametrize(
+    'lines,output',
+    [
+        (('ACME', ), 'ACME'),  # one line...
+        (('Foo', 'Bar', 'Baz'), 'Foo\nBar\nBaz'),  # more than one line...
+    ]
+)
+def test_file_writer_in_context(tmpdir, lines, output):
+    fs, filename, services = txt_tester.get_services_for_writer(tmpdir)
+
+    with NodeExecutionContext(FileWriter(path=filename), services=services) as context:
+        context.write(BEGIN, *map(Bag, lines), END)
+        for _ in range(len(lines)):
+            context.step()
+
+    with fs.open(filename) as fp:
+        assert fp.read() == output
+
+
+def test_file_reader(tmpdir):
+    fs, filename, services = txt_tester.get_services_for_reader(tmpdir)
+
+    with BufferingNodeExecutionContext(FileReader(path=filename), services=services) as context:
+        context.write_sync(Bag())
+        output = context.get_buffer()
+
+    assert len(output) == 2
+    assert output[0] == 'Hello'
+    assert output[1] == 'World'