modify createYamlTableRuleConfig()

sharding-core/src/test/java/io/shardingsphere/core/yaml/sharding/YamlTableRuleConfigurationTest.java

@@ -53,6 +53,7 @@ public final class YamlTableRuleConfigurationTest {
         YamlTableRuleConfiguration result = new YamlTableRuleConfiguration();
         result.setLogicTable("t_order");
         result.setActualDataNodes("ds_${0..1}.t_order_${0..1}");
+        result.setKeyGenerator(new YamlKeyGeneratorConfiguration());
         result.getKeyGenerator().setKeyGeneratorColumnName("order_id");
         result.getKeyGenerator().setKeyGeneratorClassName(DefaultKeyGenerator.class.getName());
         result.setLogicIndex("order_index");