Fix limit parameter not passed to requests by HTTP backend

annif/backend/http.py

@@ -68,6 +68,8 @@ def _suggest(self, text: str, params: dict[str, Any]) -> list[SubjectSuggestion]
         data = {"text": text}
         if "project" in params:
             data["project"] = params["project"]
+        if "limit" in params:
+            data["limit"] = params["limit"]
 
         try:
             req = requests.post(params["endpoint"], data=data, headers=self.headers)

tests/test_backend_http.py

@@ -84,6 +84,29 @@ def test_http_suggest_with_results(app_project):
         assert hits[0].score == 1.0
 
 
+def test_http_suggest_post_args(app_project):
+    with unittest.mock.patch("requests.post"):
+        http_type = annif.backend.get_backend("http")
+        http = http_type(
+            backend_id="http",
+            config_params={
+                "endpoint": "http://api.example.org/analyze",
+                "project": "dummy",
+                "limit": "42",
+            },
+            project=app_project,
+        )
+        http.suggest(["this is some text"])
+
+        assert requests.post.call_args.args == ("http://api.example.org/analyze",)
+        assert "text" in requests.post.call_args.kwargs["data"]
+        assert requests.post.call_args.kwargs["data"]["text"] == "this is some text"
+        assert "project" in requests.post.call_args.kwargs["data"]
+        assert requests.post.call_args.kwargs["data"]["project"] == "dummy"
+        assert "limit" in requests.post.call_args.kwargs["data"]
+        assert requests.post.call_args.kwargs["data"]["limit"] == "42"
+
+
 def test_http_suggest_zero_score(project):
     with unittest.mock.patch("requests.post") as mock_request:
         # create a mock response whose .json() method returns the list that we