still testing

tests/io/test_json.py

@@ -0,0 +1,37 @@
+import pytest
+
+from bonobo import to_json
+from bonobo.util.lifecycle import get_initializer, get_finalizer
+
+
+class ContextMock:
+    pass
+
+
+def test_write_json_to_file(tmpdir):
+    file = tmpdir.join('output.json')
+    json_writer = to_json(file)
+    context = ContextMock()
+
+    get_initializer(json_writer)(context)
+    json_writer(context, {'foo': 'bar'})
+    get_finalizer(json_writer)(context)
+
+    assert file.read() == '''[
+{"foo": "bar"}
+]'''
+
+    with pytest.raises(AttributeError):
+        getattr(context, 'fp')
+
+    with pytest.raises(AttributeError):
+        getattr(context, 'first')
+
+
+def test_write_json_without_initializer_should_not_work(tmpdir):
+    file = tmpdir.join('output.json')
+    json_writer = to_json(file)
+
+    context = ContextMock()
+    with pytest.raises(AttributeError):
+        json_writer(context, {'foo': 'bar'})