Create mock eda client

tests/test_eda_client.py

@@ -0,0 +1,17 @@
+from atst.eda_client import MockEDAClient
+
+
+client = MockEDAClient()
+
+def test_list_contracts():
+    results = client.list_contracts()
+    assert len(results) == 3
+
+def test_get_contract():
+    result = client.get_contract("DCA10096D0052", "y")
+    assert result["contract_no"] == "DCA10096D0052"
+    assert result["amount"] == 2000000
+
+def test_contract_not_found():
+    result = client.get_contract("abc", "y")
+    assert result is None