Add test cases on MySQLShardingSphereStatisticsBuilder (#34364) (#34372)

infra/common/src/test/java/org/apache/shardingsphere/infra/metadata/statistics/builder/dialect/MySQLShardingSphereStatisticsBuilderTest.java

@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.shardingsphere.infra.metadata.statistics.builder.dialect;
+
+import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import org.apache.shardingsphere.infra.metadata.statistics.ShardingSphereDatabaseData;
+import org.junit.jupiter.api.Test;
+
+class MySQLShardingSphereStatisticsBuilderTest {
+
+    @Test
+    void assertBuild() {
+        ShardingSphereDatabase database = mockDatabase();
+        ShardingSphereDatabaseData databaseData = new MySQLShardingSphereStatisticsBuilder().build(database);
+        assertTrue(databaseData.getSchemaData().containsKey("shardingsphere"));
+        assertTrue(databaseData.getSchemaData().get("shardingsphere").getTableData().containsKey("cluster_information"));
+        assertTrue(databaseData.getSchemaData().get("shardingsphere").getTableData().containsKey("sharding_table_statistics"));
+    }
+
+    private ShardingSphereDatabase mockDatabase() {
+        ShardingSphereDatabase database = mock(ShardingSphereDatabase.class);
+        when(database.containsSchema("shardingsphere")).thenReturn(true);
+        return database;
+    }
+}