add testcase for InsertValue (#6859)

* add testcase for InsertValue

* fix checkstyle build issue

* fix checkstyle for InsertValue

* follow the unit test code of conduct

* add copyright for InsertValueTest (#6859)
Co-authored-by: Nza-zengweidong <za-zengweidong@zhongan.io>

shardingsphere-infra/shardingsphere-infra-rewrite/shardingsphere-infra-rewrite-engine/src/test/java/org/apache/shardingsphere/infra/rewrite/sql/token/pojo/generic/InsertValueTest.java

+/*
+ * 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.rewrite.sql.token.pojo.generic;
+
+import org.apache.shardingsphere.sql.parser.sql.segment.dml.expr.ExpressionSegment;
+import org.apache.shardingsphere.sql.parser.sql.segment.dml.expr.complex.ComplexExpressionSegment;
+import org.apache.shardingsphere.sql.parser.sql.segment.dml.expr.simple.LiteralExpressionSegment;
+import org.apache.shardingsphere.sql.parser.sql.segment.dml.expr.simple.ParameterMarkerExpressionSegment;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+public class InsertValueTest {
+
+    @Test
+    public void assertToString() {
+        List<ExpressionSegment> expressionSegmentList = new ArrayList<>();
+
+        ParameterMarkerExpressionSegment parameterMarkerExpressionSegment =
+                new ParameterMarkerExpressionSegment(1, 1, 1);
+        LiteralExpressionSegment literalExpressionSegment
+                = new LiteralExpressionSegment(2, 2, "literals");
+        ComplexExpressionSegment complexExpressionSegment = new ComplexExpressionSegment() {
+            @Override
+            public String getText() {
+                return "complexExpressionSegment";
+            }
+
+            @Override
+            public int getStartIndex() {
+                return 3;
+            }
+
+            @Override
+            public int getStopIndex() {
+                return 3;
+            }
+        };
+
+        expressionSegmentList.add(parameterMarkerExpressionSegment);
+        expressionSegmentList.add(literalExpressionSegment);
+        expressionSegmentList.add(complexExpressionSegment);
+
+        InsertValue insertValue = new InsertValue(expressionSegmentList);
+        String actualToString = insertValue.toString();
+        String expectedToString = "(?, 'literals', complexExpressionSegment)";
+        assertThat(actualToString, is(expectedToString));
+    }
+}