added binary support in dictionaries via base64 encoding

test/test_blob_to_dict_base64.py

@@ -0,0 +1,21 @@
+import os
+import capnp
+import base64
+import pytest
+
+this_dir = os.path.dirname(__file__)
+
+
+@pytest.fixture
+def blob_schema():
+    return capnp.load(os.path.join(this_dir, "blob_test.capnp"))
+
+
+def test_blob_to_dict(blob_schema):
+    blob_value = b"hello world"
+    blob = blob_schema.BlobTest(blob=blob_value)
+    blob_dict = blob.to_dict(encode_bytes_as_base64=True)
+    assert base64.b64decode(blob_dict["blob"]) == blob_value
+    msg = blob_schema.BlobTest.new_message()
+    msg.from_dict(blob_dict)
+    assert blob.blob == blob_value