refactor: moved the GC stuff around and corrected all tests

steamcache/steamcache_test.go

@@ -9,8 +9,6 @@ import (
 )
 
 func TestCaching(t *testing.T) {
-	t.Parallel()
-
 	td := t.TempDir()
 
 	os.WriteFile(filepath.Join(td, "key2"), []byte("value2"), 0644)
@@ -84,3 +82,29 @@ func TestCaching(t *testing.T) {
 		t.Errorf("Open failed: got nil, want error")
 	}
 }
+
+func TestCacheMissAndHit(t *testing.T) {
+	sc := New("localhost:8080", "0", 0, "1G", 100, t.TempDir(), "")
+
+	key := "testkey"
+	value := []byte("testvalue")
+
+	// Simulate miss: but since no upstream, skip full ServeHTTP, test VFS
+	w, err := sc.vfs.Create(key, int64(len(value)))
+	if err != nil {
+		t.Fatal(err)
+	}
+	w.Write(value)
+	w.Close()
+
+	rc, err := sc.vfs.Open(key)
+	if err != nil {
+		t.Fatal(err)
+	}
+	got, _ := io.ReadAll(rc)
+	rc.Close()
+
+	if string(got) != string(value) {
+		t.Errorf("expected %s, got %s", value, got)
+	}
+}