// vfs/gc/gc_test.go
package gc

import (
	"testing"
)

func TestGetGCAlgorithm(t *testing.T) {
	tests := []struct {
		name      string
		algorithm GCAlgorithm
		expected  bool // true if we expect a non-nil function
	}{
		{"LRU", LRU, true},
		{"LFU", LFU, true},
		{"FIFO", FIFO, true},
		{"Largest", Largest, true},
		{"Smallest", Smallest, true},
		{"Hybrid", Hybrid, true},
		{"Unknown", "unknown", true}, // should fall back to LRU
		{"Empty", "", true},          // should fall back to LRU
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			fn := GetGCAlgorithm(tt.algorithm)
			if fn == nil {
				t.Errorf("GetGCAlgorithm(%s) returned nil, expected non-nil function", tt.algorithm)
			}
		})
	}
}

func TestGCAlgorithmConstants(t *testing.T) {
	expectedAlgorithms := []GCAlgorithm{LRU, LFU, FIFO, Largest, Smallest, Hybrid}

	for _, algo := range expectedAlgorithms {
		if algo == "" {
			t.Errorf("GC algorithm constant is empty")
		}
	}
}