mirror of
https://github.com/rjNemo/underscore
synced 2026-06-06 02:26:42 +00:00
Ruidy
5240c27fcd
- Add First: returns first element or error if empty - Add FirstN: returns first n elements safely - ErrEmptySlice error for consistent error handling - Comprehensive tests including edge cases - Benchmarks included Resolves Issue 16 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude <noreply@anthropic.com>
97 lines
1.9 KiB
Go
97 lines
1.9 KiB
Go
package underscore_test
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import (
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"errors"
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"testing"
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"github.com/stretchr/testify/assert"
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u "github.com/rjNemo/underscore"
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)
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func TestFirst(t *testing.T) {
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nums := []int{1, 2, 3, 4, 5}
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result, err := u.First(nums)
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assert.NoError(t, err)
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assert.Equal(t, 1, result)
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}
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func TestFirstEmpty(t *testing.T) {
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_, err := u.First([]int{})
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assert.Error(t, err)
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assert.True(t, errors.Is(err, u.ErrEmptySlice))
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}
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func TestFirstSingleElement(t *testing.T) {
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result, err := u.First([]int{42})
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assert.NoError(t, err)
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assert.Equal(t, 42, result)
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}
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func TestFirstStrings(t *testing.T) {
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words := []string{"hello", "world"}
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result, err := u.First(words)
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assert.NoError(t, err)
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assert.Equal(t, "hello", result)
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}
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func TestFirstN(t *testing.T) {
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nums := []int{1, 2, 3, 4, 5}
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result := u.FirstN(nums, 3)
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assert.Equal(t, []int{1, 2, 3}, result)
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}
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func TestFirstNEmpty(t *testing.T) {
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result := u.FirstN([]int{}, 3)
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assert.Equal(t, []int{}, result)
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}
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func TestFirstNZero(t *testing.T) {
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nums := []int{1, 2, 3}
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result := u.FirstN(nums, 0)
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assert.Equal(t, []int{}, result)
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}
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func TestFirstNNegative(t *testing.T) {
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nums := []int{1, 2, 3}
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result := u.FirstN(nums, -5)
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assert.Equal(t, []int{}, result)
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}
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func TestFirstNGreaterThanLength(t *testing.T) {
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nums := []int{1, 2, 3}
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result := u.FirstN(nums, 10)
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assert.Equal(t, []int{1, 2, 3}, result)
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}
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func TestFirstNSingleElement(t *testing.T) {
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result := u.FirstN([]int{42}, 1)
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assert.Equal(t, []int{42}, result)
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}
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func TestFirstNAll(t *testing.T) {
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nums := []int{1, 2, 3}
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result := u.FirstN(nums, 3)
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assert.Equal(t, []int{1, 2, 3}, result)
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}
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func BenchmarkFirst(b *testing.B) {
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nums := []int{1, 2, 3, 4, 5}
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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u.First(nums)
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}
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}
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func BenchmarkFirstN(b *testing.B) {
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nums := make([]int, 1000)
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for i := range nums {
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nums[i] = i
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}
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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u.FirstN(nums, 100)
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}
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}
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