package underscore_test

import (
	"testing"

	"github.com/stretchr/testify/assert"

	u "github.com/rjNemo/underscore"
)

func TestUnique(t *testing.T) {
	nums := []int{1, 4, 2, 5, 3, 1, 5, 2, 8, 9}
	want := []int{1, 4, 2, 5, 3, 8, 9}

	assert.Equal(t, want, u.Unique(nums))
}

func TestUniqueEmpty(t *testing.T) {
	result := u.Unique([]int{})
	assert.Empty(t, result)
}

func TestUniqueSingleElement(t *testing.T) {
	result := u.Unique([]int{42})
	assert.Equal(t, []int{42}, result)
}

func TestUniqueNoDuplicates(t *testing.T) {
	nums := []int{1, 2, 3, 4, 5}
	result := u.Unique(nums)
	assert.Equal(t, nums, result)
}

func TestUniqueAllSame(t *testing.T) {
	nums := []int{5, 5, 5, 5, 5}
	result := u.Unique(nums)
	assert.Equal(t, []int{5}, result)
}