Add graphql tests

tests/test_graphql.py

@@ -0,0 +1,35 @@
+import pytest
+import json
+from fbchat._graphql import ConcatJSONDecoder, queries_to_json, response_to_json
+
+
+@pytest.mark.parametrize(
+    "content,result",
+    [
+        ("", []),
+        ('{"a":"b"}', [{"a": "b"}]),
+        ('{"a":"b"}{"b":"c"}', [{"a": "b"}, {"b": "c"}]),
+        (' \n{"a":  "b"  }     \n {  "b" \n\n : "c" }', [{"a": "b"}, {"b": "c"}]),
+    ],
+)
+def test_concat_json_decoder(content, result):
+    assert result == json.loads(content, cls=ConcatJSONDecoder)
+
+
+def test_queries_to_json():
+    assert {"q0": "A", "q1": "B", "q2": "C"} == json.loads(
+        queries_to_json("A", "B", "C")
+    )
+
+
+def test_response_to_json():
+    data = (
+        '{"q1":{"data":{"b":"c"}}}\r\n'
+        '{"q0":{"response":[1,2]}}\r\n'
+        "{\n"
+        '   "successful_results": 2,\n'
+        '   "error_results": 0,\n'
+        '   "skipped_results": 0\n'
+        "}"
+    )
+    assert [[1, 2], {"b": "c"}] == response_to_json(data)