Function TestChatReadsUsageTokens

internal/llm/llm_test.go:395–415

TestChatReadsUsageTokens: tokens come from `usage.completion_tokens` (and prompt_tokens rides along for the debug-log calibration), not content length; we trust what the backend reports.

(t *testing.T)

// turn re-sends corrupt JSON and the backend 400s forever (session poisoning).
func TestToInputParseErrorArgsStayValidJSON(t *testing.T) {
	items := toInput([]chmctx.Message{{
		Role: chmctx.RoleAssistant,
		ToolCalls: []chmctx.ToolCall{{
			ID:        "c1",
			Name:      "write_file",
			Arguments: map[string]any{"_parse_error": "unexpected end of JSON input"},
		}},
	}})
	args := items[0].(functionCallItem).Arguments
	if !json.Valid([]byte(args)) {
		t.Fatalf("arguments must stay valid JSON to avoid poisoning the session: %q", args)
	}
}

// TestChatToolsAreFlat: the Responses tool declaration has no `function`
// wrapper; the old chat-completions nesting 400s here.
func TestChatToolsAreFlat(t *testing.T) {
	var gotBody string
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		b, _ := io.ReadAll(r.Body)
		gotBody = string(b)
		sseOK(w, []string{completed(0, 0)})
	}))
	defer srv.Close()