tests(version): add tests to fintoc version header

tests/test_client.py

@@ -12,11 +12,18 @@ def setup_method(self):
         self.api_key = "super_secret_api_key"
         self.user_agent = "fintoc-python/test"
         self.params = {"first_param": "first_value", "second_param": "second_value"}
+        self.version = '2023-01-01'
 
-    def create_client(self, params=False):
-        if not params:
+    def create_client(self, params=False, version=False):
+        if not params and not version:
             return Client(self.base_url, self.api_key, self.user_agent)
-        return Client(self.base_url, self.api_key, self.user_agent, params=self.params)
+        if params and not version:
+            return Client(self.base_url, self.api_key, self.user_agent, params=self.params)
+        if not params and version:
+            return Client(self.base_url, self.api_key, self.user_agent, version=self.version)
+        return Client(
+            self.base_url, self.api_key, self.user_agent, params=self.params, version=self.version
+        )
 
     def test_client_creation_without_params(self):
         client = self.create_client()
@@ -35,13 +42,14 @@ def test_client_creation_with_params(self):
         assert client.params == self.params
 
     def test_client_headers(self):
-        client = self.create_client()
+        client = self.create_client(version=True)
         assert isinstance(client.headers, dict)
-        assert len(client.headers.keys()) == 2
+        assert len(client.headers.keys()) == 3
         assert "Authorization" in client.headers
         assert "User-Agent" in client.headers
         assert client.headers["Authorization"] == self.api_key
         assert client.headers["User-Agent"] == self.user_agent
+        assert client.headers["Fintoc-Version"] == self.version
 
     def test_client_http_subclient_lazy_initialization(self):
         # pylint: disable=protected-access