Add TrieTreeSizeTest

rskj-core/src/test/java/co/rsk/trie/TrieTreeSizeTest.java

@@ -0,0 +1,49 @@
+/*
+ * This file is part of RskJ
+ * Copyright (C) 2019 RSK Labs Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package co.rsk.trie;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import static org.hamcrest.Matchers.is;
+
+public class TrieTreeSizeTest {
+    @Test
+    public void emptyChildrenSize() {
+        Trie trie = new Trie();
+        long emptyChildrenSize = trie.getChildrenSize().value;
+        Assert.assertThat(emptyChildrenSize, is(0L));
+    }
+
+    @Test
+    public void childrenSizeShortValue() {
+        Trie trie = new Trie()
+                .put(new byte[]{0x00}, new byte[]{0x01})
+                .put(new byte[]{0x01}, new byte[32]);
+        Assert.assertThat(trie.getChildrenSize().value, is(37L));
+    }
+
+    @Test
+    public void childrenSizeLongValue() {
+        Trie trie = new Trie()
+                .put(new byte[]{0x00}, new byte[]{0x01})
+                .put(new byte[]{0x01}, new byte[33]);
+        Assert.assertThat(trie.getChildrenSize().value, is(40L));
+    }
+}