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: lexer_test.go
    path of file: ./repos/trivy/pkg/licensing/expression
    
    the code of the file until where you have to start completion: package expression

import (
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestLexer_Lex(t *testing.T) {
	tests := []struct {
		name  string
		input string
		want  []Token
	}{
		{
			name:  "simple",
			input: "GPL-2.0-only",
			want: []Token{
				{
					token:   IDENT,
					literal: "GPL-2.0-only",
				},
			},
		},
		{
			name:  "with space",
			input: "Public Domain",
			want: []Token{
				{
					token:   IDENT,
					literal: "Public",
				},
				{
					token:   IDENT,
					literal: "Domain",
				},
			},
		},
		{
			name:  "and",
			input: "Public Domain AND MIT",
			want: []Token{
				{
					token:   IDENT,
					literal: "Public",
				},
				{
					token:   IDENT,
					literal: "Domain",
				},
				{
					token:   AND,
					literal: "AND",
				},
				{
					token:   IDENT,
					literal: "MIT",
				},
			},
		},
		{
			name:  "or",
			input: "LGPL-2.1-only OR MIT OR BSD-3-Clause",
			want: []Token{
				{
					token:   IDENT,
					literal: "LGPL-2.1-only",
				},
				{
					token:   OR,
					literal: "OR",
				},
				{
					token:   IDENT,
					literal: "MIT",
				},
				{
					token:   OR,
					literal: "OR",
				},
				{
					token:   IDENT,
					literal: "BSD-3-Clause",
				},
			},
		},
		{
			name:  "parenthesis",
			input: "LGPL-2.1-only AND (MIT OR BSD-3-Clause)",
			want: []Token{
				{
					token:   IDENT,
					literal: "LGPL-2.1-only",
				},
				{
					token:   AND,
					literal: "AND",
				},
				{
					token:   int('('),
					literal: "(",
				},
				{
					token:   IDENT,
					literal: "MIT",
				},
				{
					token:   OR,
					literal: "OR",
				},
				{
					token:   IDENT,
					literal: "BSD-3-Clause",
				},
				{
					token:   int(')'),
					literal: ")",
				},
			},
		},
		{
			name:  "exception",
			input: "LGPL-2.1-only AND GPL-2.0-or-later WITH Bison-exception-2.2",
			want: [
    
func TestLexer_Lex(t *testing.T) {
	tests := []struct {
		name  string
		input string
		want  []Token
	}{
		{
			name:  "simple",
			input: "GPL-2.0-only",
			want: []Token{
				{
					token:   IDENT,
					literal: "GPL-2.0-only",
				},
			},
		},
		{
			name:  "with space",
			input: "Public Domain",
			want: []Token{
				{
					token:   IDENT,
					literal: "Public",
				},
				{
					token:   IDENT,
					literal: "Domain",
				},
			},
		},
		{
			name:  "and",
			input: "Public Domain AND MIT",
			want: []Token{
				{
					token:   IDENT,
					literal: "Public",
				},
				{
					token:   IDENT,
					literal: "Domain",
				},
				{
					token:   AND,
					literal: "AND",
				},
				{
					token:   IDENT,
					literal: "MIT",
				},
			},
		},
		{
			name:  "or",
			input: "LGPL-2.1-only OR MIT OR BSD-3-Clause",
			want: []Token{
				{
					token:   IDENT,
					literal: "LGPL-2.1-only",
				},
				{
					token:   OR,
					literal: "OR",
				},
				{
					token:   IDENT,
					literal: "MIT",
				},
				{
					token:   OR,
					literal: "OR",
				},
				{
					token:   IDENT,
					literal: "BSD-3-Clause",
				},
			},
		},
		{
			name:  "parenthesis",
			input: "LGPL-2.1-only AND (MIT OR BSD-3-Clause)",
			want: []Token{
				{
					token:   IDENT,
					literal: "LGPL-2.1-only",
				},
				{
					token:   AND,
					literal: "AND",
				},
				{
					token:   int('('),
					literal: "(",
				},
				{
					token:   IDENT,
					literal: "MIT",
				},
				{
					token:   OR,
					literal: "OR",
				},
				{
					token:   IDENT,
					literal: "BSD-3-Clause",
				},
				{
					token:   int(')'),
					literal: ")",
				},
			},
		},
		{
			name:  "exception",
			input: "LGPL-2.1-only AND GPL-2.0-or-later WITH Bison-exception-2.2",
			want: []Token{
				{
					token:   IDENT,
					literal: "LGPL-2.1-only",
				},
				{
					token:   AND,
					literal: "AND",
				},
				{
					token:   IDENT,
					literal: "GPL-2.0-or-later",
				},
				{
					token:   WITH,
					literal: "WITH",
				},
				{
					token:   IDENT,
					literal: "Bison-exception-2.2",
				},
			},
		},
		{
			name:  "plus",
			input: "Public Domain+",
			want: []Token{
				{
					token:   IDENT,
					literal: "Public",
				},
				{
					token:   IDENT,
					literal: "Domain",
				},
				{
					token:   int('+'),
					literal: "+",
				},
			},
		},
		{
			name:  "plus in the middle",
			input: "ISC+IBM",
			want: []Token{
				{
					token:   IDENT,
					literal: "ISC+IBM",
				},
			},
		},
		{
			name:  "plus with the parenthesis",
			input: "(GPL1.0+)",
			want: []Token{
				{
					token:   int('('),
					literal: "(",
				},
				{
					token:   IDENT,
					literal: "GPL1.0",
				},
				{
					token:   int('+'),
					literal: "+",
				},
				{
					token:   int(')'),
					literal: ")",
				},
			},
		},
		{
			name:  "utf-8",
			input: "GPL1.0+ " + string(byte(0x20)) + "„ÅÇüáØüáµ" + " and LGPL1.0",
			want: []Token{
				{
					token:   IDENT,
					literal: "GPL1.0",
				},
				{
					token:   int('+'),
					literal: "+",
				},
				{
					token:   IDENT,
					literal: "„ÅÇüáØüáµ",
				},
				{
					token:   AND,
					literal: "and",
				},
				{
					token:   IDENT,
					literal: "LGPL1.0",
				},
			},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			l := NewLexer(strings.NewReader(tt.input))
			var got []Token
			var lval yySymType
			for l.Lex(&lval) != 0 {
				got = append(got, lval.token)
				lval = yySymType{}
			}
			require.NoError(t, l.Err())
			assert.Equal(t, tt.want, got)
		})
	}
}