wip: filesystem as a service.

tests/io/test_json.py

@@ -1,22 +1,23 @@
 import pytest
 
-from bonobo import Bag, JsonReader, JsonWriter
+from bonobo import Bag, JsonReader, JsonWriter, open_fs
 from bonobo.constants import BEGIN, END
 from bonobo.execution.node import NodeExecutionContext
 from bonobo.util.testing import CapturingNodeExecutionContext
 
 
 def test_write_json_to_file(tmpdir):
-    file = tmpdir.join('output.json')
-    writer = JsonWriter(path=str(file))
-    context = NodeExecutionContext(writer, None)
+    fs, filename = open_fs(tmpdir), 'output.json'
+
+    writer = JsonWriter(path=filename)
+    context = NodeExecutionContext(writer, services={'fs': fs})
 
     context.start()
     context.recv(BEGIN, Bag({'foo': 'bar'}), END)
     context.step()
     context.stop()
 
-    assert file.read() == '[\n{"foo": "bar"}\n]'
+    assert fs.open(filename).read() == '[\n{"foo": "bar"}\n]'
 
     with pytest.raises(AttributeError):
         getattr(context, 'file')
@@ -26,11 +27,11 @@ def test_write_json_to_file(tmpdir):
 
 
 def test_read_json_from_file(tmpdir):
-    file = tmpdir.join('input.json')
-    file.write('[{"x": "foo"},{"x": "bar"}]')
-    reader = JsonReader(path=str(file))
+    fs, filename = open_fs(tmpdir), 'input.json'
+    fs.open(filename, 'w').write('[{"x": "foo"},{"x": "bar"}]')
+    reader = JsonReader(path=filename)
 
-    context = CapturingNodeExecutionContext(reader, None)
+    context = CapturingNodeExecutionContext(reader, services={'fs': fs})
 
     context.start()
     context.recv(BEGIN, Bag(), END)