tests: add backend tests

backend/pkg/slices/map_test.go

@@ -0,0 +1,83 @@
+package slices
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMap(t *testing.T) {
+	// Test with integers
+	ints := []int{1, 2, 3, 4, 5}
+	result := Map(ints, func(x int) int {
+		return x * 2
+	})
+	assert.Equal(t, []int{2, 4, 6, 8, 10}, result)
+
+	// Test with strings
+	strings := []string{"a", "b", "c"}
+	resultStr := Map(strings, func(s string) string {
+		return s + "_suffix"
+	})
+	assert.Equal(t, []string{"a_suffix", "b_suffix", "c_suffix"}, resultStr)
+
+	// Test with empty slice
+	empty := []int{}
+	resultEmpty := Map(empty, func(x int) int {
+		return x * 2
+	})
+	assert.Equal(t, []int{}, resultEmpty)
+}
+
+func TestFirst(t *testing.T) {
+	// Test with non-empty slice
+	ints := []int{1, 2, 3}
+	item, found := First(ints)
+	assert.True(t, found)
+	assert.Equal(t, 1, item)
+
+	// Test with empty slice
+	empty := []int{}
+	item, found = First(empty)
+	assert.False(t, found)
+	assert.Equal(t, 0, item)
+}
+
+func TestLast(t *testing.T) {
+	// Test with non-empty slice
+	ints := []int{1, 2, 3}
+	item, found := Last(ints)
+	assert.True(t, found)
+	assert.Equal(t, 3, item)
+
+	// Test with empty slice
+	empty := []int{}
+	item, found = Last(empty)
+	assert.False(t, found)
+	assert.Equal(t, 0, item)
+}
+
+func TestFindFirst(t *testing.T) {
+	// Test with matching element
+	ints := []int{1, 2, 3, 4, 5}
+	item, found := FindFirst(ints, func(x int) bool {
+		return x > 3
+	})
+	assert.True(t, found)
+	assert.Equal(t, 4, item)
+
+	// Test with no matching element
+	item, found = FindFirst(ints, func(x int) bool {
+		return x > 10
+	})
+	assert.False(t, found)
+	assert.Equal(t, 0, item)
+
+	// Test with empty slice
+	empty := []int{}
+	item, found = FindFirst(empty, func(x int) bool {
+		return x > 3
+	})
+	assert.False(t, found)
+	assert.Equal(t, 0, item)
+}