stack_test.go

// Copyright 2021 by Leipzig University Library, http://ub.uni-leipzig.de
//                   The Finc Authors, http://finc.info
//                   Martin Czygan, <martin.czygan@uni-leipzig.de>
//
// This file is part of some open source application.
//
// Some open source application is free software: you can redistribute
// it and/or modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation, either
// version 3 of the License, or (at your option) any later version.
//
// Some open source application is distributed in the hope that it will
// be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Foobar.  If not, see <http://www.gnu.org/licenses/>.
//
// @license GPL-3.0+ <http://spdx.org/licenses/GPL-3.0+>

package zek

import "testing"

func TestStack(t *testing.T) {
	s := Stack{}
	if s.Len() != 0 {
		t.Errorf("empty stack contains %d items", s.Len())
	}
	s.Put(1)
	s.Put(2)
	s.Put(3)
	if s.Len() != 3 {
		t.Errorf("want 3, got %d items", s.Len())
	}
	if v := s.Pop(); v != 3 {
		t.Errorf("pop want 3, got %v", v)
	}
	s.Put(4)
	if v := s.Pop(); v != 4 {
		t.Errorf("pop want 4, got %v", v)
	}
	if v := s.Pop(); v != 2 {
		t.Errorf("pop want 2, got %v", v)
	}
	if v := s.Pop(); v != 1 {
		t.Errorf("pop want 1, got %v", v)
	}
	if s.Len() != 0 {
		t.Errorf("empty stack contains %d items", s.Len())
	}
}