feat: backend service

backend/internal/admin/cache_test.go

@@ -0,0 +1,98 @@
+package admin_test
+
+import (
+	"context"
+	"database/sql"
+	"testing"
+	"time"
+
+	"galaxy/backend/internal/admin"
+
+	_ "github.com/jackc/pgx/v5/stdlib"
+)
+
+func TestCacheGetReturnsFalseUntilPut(t *testing.T) {
+	t.Parallel()
+	cache := admin.NewCache()
+	if _, _, ok := cache.Get("alice"); ok {
+		t.Fatalf("Get on empty cache returned ok=true")
+	}
+}
+
+func TestCacheReadyFlipsAfterWarm(t *testing.T) {
+	t.Parallel()
+	cache := admin.NewCache()
+	if cache.Ready() {
+		t.Fatalf("Ready() = true before Warm")
+	}
+	store := admin.NewStore(stubDB(t))
+	if err := cache.Warm(context.Background(), store); err == nil {
+		t.Fatalf("Warm against an empty stub DB unexpectedly succeeded")
+	}
+	if cache.Ready() {
+		t.Fatalf("Ready() flipped after a failed Warm")
+	}
+}
+
+func TestCachePutIsVisibleToReader(t *testing.T) {
+	t.Parallel()
+	cache := admin.NewCache()
+	now := time.Date(2026, 5, 3, 12, 0, 0, 0, time.UTC)
+	cache.Put(admin.Admin{
+		Username:  "alice",
+		CreatedAt: now,
+	}, []byte("hash-bytes"))
+
+	got, hash, ok := cache.Get("alice")
+	if !ok {
+		t.Fatalf("Get after Put returned ok=false")
+	}
+	if got.Username != "alice" {
+		t.Fatalf("Get returned username %q, want alice", got.Username)
+	}
+	if string(hash) != "hash-bytes" {
+		t.Fatalf("Get returned hash %q, want hash-bytes", string(hash))
+	}
+	if cache.Size() != 1 {
+		t.Fatalf("Size = %d, want 1", cache.Size())
+	}
+}
+
+func TestCachePutOverwrites(t *testing.T) {
+	t.Parallel()
+	cache := admin.NewCache()
+	cache.Put(admin.Admin{Username: "alice"}, []byte("old"))
+	cache.Put(admin.Admin{Username: "alice"}, []byte("new"))
+
+	_, hash, ok := cache.Get("alice")
+	if !ok || string(hash) != "new" {
+		t.Fatalf("Get after overwrite returned ok=%v hash=%q, want ok=true hash=new", ok, string(hash))
+	}
+	if cache.Size() != 1 {
+		t.Fatalf("Size after overwrite = %d, want 1", cache.Size())
+	}
+}
+
+func TestCacheRemove(t *testing.T) {
+	t.Parallel()
+	cache := admin.NewCache()
+	cache.Put(admin.Admin{Username: "alice"}, []byte("hash"))
+	cache.Remove("alice")
+	if _, _, ok := cache.Get("alice"); ok {
+		t.Fatalf("Get after Remove returned ok=true")
+	}
+	cache.Remove("alice") // idempotent — must not panic
+}
+
+// stubDB returns a *sql.DB that fails every query. Used only by the
+// "Warm-on-failure does not flip Ready" test where the actual driver
+// behaviour is irrelevant.
+func stubDB(t *testing.T) *sql.DB {
+	t.Helper()
+	db, err := sql.Open("pgx", "postgres://disabled.invalid:5432/none?sslmode=disable&connect_timeout=1")
+	if err != nil {
+		t.Fatalf("sql.Open: %v", err)
+	}
+	t.Cleanup(func() { _ = db.Close() })
+	return db
+}