You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: magic_test.go
    path of file: ./repos/mimetype/internal/magic
    
    the code of the file until where you have to start completion: package magic

import (
	"io"
	"testing"
)

func TestMagic(t *testing.T) {
	tCases := []struct {
		name     string
		detector Detector
		raw      string
		limit    uint32
		res  
    
func TestDropLastLine(t *testing.T) {
	dropTests := []struct {
		raw   string
		cutAt uint32
		res   string
	}{
		{"", 0, ""},
		{"", 1, ""},
		{"å", 2, "å"},
		{"\n", 0, "\n"},
		{"\n", 1, "\n"},
		{"\n\n", 1, "\n"},
		{"\n\n", 3, "\n\n"},
		{"a\n\n", 3, "a\n"},
		{"\na\n", 3, "\na"},
		{"å\n\n", 5, "å\n\n"},
		{"\nå\n", 5, "\nå\n"},
	}
	for i, tt := range dropTests {
		gotR := dropLastLine([]byte(tt.raw), tt.cutAt)
		got, _ := io.ReadAll(gotR)
		if got := string(got); got != tt.res {
			t.Errorf("dropLastLine %d error: expected %q; got %q", i, tt.res, got)
		}
	}
}