package lsp

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestResolveGoTest_AppendsToExisting(t *testing.T) {
	s := newTestServer()
	dir := t.TempDir()
	src := filepath.Join(dir, "m.go")
	uri := "file://" + src
	s.setDocument(uri, "package m\n\nfunc F(){}\n")
	// Create existing test file
	testPath := filepath.Join(dir, "m_test.go")
	if err := os.WriteFile(testPath, []byte("package m\n\nimport \"testing\"\n\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	// LLM path to increase generateGoTestFunction coverage
	s.llmClient = fakeLLM{resp: "func TestF(t *testing.T) {}"}
	we, testURI, jump, ok := s.resolveGoTest(uri, Position{Line: 2})
	if !ok || len(we.Changes) == 0 {
		t.Fatalf("expected append edit")
	}
	if !strings.HasSuffix(testURI, "_test.go") {
		t.Fatalf("unexpected uri: %s", testURI)
	}
	edits := we.Changes[testURI]
	if len(edits) != 1 || !strings.Contains(edits[0].NewText, "TestF") {
		t.Fatalf("expected append with TestF")
	}
	if jump.Start.Line < 0 {
		t.Fatalf("expected non-negative jump line")
	}
}