package llm

import (
    "context"
    "testing"
)

func TestNewFromConfig_DefaultsAndErrors(t *testing.T) {
    // Unknown provider
    if _, err := NewFromConfig(Config{Provider:"bogus"}, "", ""); err == nil { t.Fatalf("expected error for unknown provider") }
    // OpenAI missing key
    if _, err := NewFromConfig(Config{Provider:"openai", OpenAIModel:"g"}, "", ""); err == nil { t.Fatalf("expected key error") }
    // Copilot missing key
    if _, err := NewFromConfig(Config{Provider:"copilot", CopilotModel:"m"}, "", ""); err == nil { t.Fatalf("expected key error") }
}

type fakeClientMin struct{}
func (fakeClientMin) Chat(context.Context, []Message, ...RequestOption) (string, error) { return "", nil }
func (fakeClientMin) Name() string { return "x" }
func (fakeClientMin) DefaultModel() string { return "m" }