Move json_schemas to its own package (#1435)

* Move zero_ex.json_schemas to its own package

* Support ALL the schemas

* Stop installing packages as editable

* HACK: cp files because CircleCI isn't

* Add example usage to sra_client README

* Tweak special case: only strip Schema as suffix

* Correct doc titles

* Clarify what kind of support ticket was raised.

* Correct inconsistencies in JSON schema names

In both ref ID's and file names.

* Add entry point for validation of JSON strings

1 files changed, 41 insertions, 0 deletions

diff --git a/python-packages/json_schemas/test/test_json_schemas.py b/python-packages/json_schemas/test/test_json_schemas.py
new file mode 100644
index 000000000..d0e9840b3
--- /dev/null
+++ b/python-packages/json_schemas/test/test_json_schemas.py
@@ -0,0 +1,41 @@
+"""Tests of zero_ex.json_schemas"""
+
+
+from zero_ex.json_schemas import _LOCAL_RESOLVER, assert_valid
+
+
+NULL_ADDRESS = "0x0000000000000000000000000000000000000000"
+
+EMPTY_ORDER = {
+    "makerAddress": NULL_ADDRESS,
+    "takerAddress": NULL_ADDRESS,
+    "senderAddress": NULL_ADDRESS,
+    "feeRecipientAddress": NULL_ADDRESS,
+    "makerAssetData": NULL_ADDRESS,
+    "takerAssetData": NULL_ADDRESS,
+    "salt": "0",
+    "makerFee": "0",
+    "takerFee": "0",
+    "makerAssetAmount": "0",
+    "takerAssetAmount": "0",
+    "expirationTimeSeconds": "0",
+    "exchangeAddress": NULL_ADDRESS,
+}
+
+
+def test_assert_valid_caches_resources():
+    """Test that the JSON ref resolver in `assert_valid()` caches resources
+
+    In order to test the cache we much access the private class of
+    `json_schemas` and reset the LRU cache on `_LocalRefResolver`.
+    For this to happen, we need to disable errror `W0212`
+    on _LOCAL_RESOLVER
+    """
+    _LOCAL_RESOLVER._remote_cache.cache_clear()  # pylint: disable=W0212
+
+    assert_valid(EMPTY_ORDER, "/orderSchema")
+    cache_info = (
+        _LOCAL_RESOLVER._remote_cache.cache_info()  # pylint: disable=W0212
+    )
+    assert cache_info.currsize == 4
+    assert cache_info.hits == 10