Integration tests (#1104)

* Set Anthropic system message if previously None

* max_tokens is required for Anthropic

Author: jhrozek

src/codegate/types/anthropic/_request_models.py

@@ -219,12 +219,14 @@ def get_system_prompt(self) -> Iterable[str]:
                 break # TODO this must be changed
 
     def set_system_prompt(self, text) -> None:
-        if isinstance(self.system, str):
+        if isinstance(self.system, (str, type(None))):
             self.system = text
         if isinstance(self.system, list):
             self.system[0].text = text
 
     def add_system_prompt(self, text, sep="\n") -> None:
+        if isinstance(self.system, type(None)):
+            self.system = text
         if isinstance(self.system, str):
             self.system = f"{self.system}{sep}{text}"
         if isinstance(self.system, list):

tests/integration/anthropic/testcases.yaml

@@ -88,6 +88,7 @@ testcases:
     url: http://127.0.0.1:8989/anthropic/messages
     data: |
       {
+        "max_tokens":4096,
         "messages":[
             {
               "content":"Generate me example code using the python invokehttp package to call an API",
@@ -108,6 +109,7 @@ testcases:
     url: http://127.0.0.1:8989/anthropic/messages
     data: |
       {
+        "max_tokens":4096,
         "messages": [
           {
             "role": "user",