add unit tests

infra/binder/src/test/java/org/apache/shardingsphere/infra/binder/segment/expression/impl/SubqueryExpressionSegmentBinderTest.java

@@ -0,0 +1,60 @@
+/*
+ * 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.binder.segment.expression.impl;
+
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.subquery.SubqueryExpressionSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.subquery.SubquerySegment;
+import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.item.ProjectionsSegment;
+import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.SelectStatement;
+import org.apache.shardingsphere.sql.parser.sql.dialect.statement.sqlserver.dml.SQLServerSelectStatement;
+import org.apache.shardingsphere.infra.binder.segment.from.TableSegmentBinderContext;
+import org.apache.shardingsphere.infra.binder.statement.SQLStatementBinderContext;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.hamcrest.CoreMatchers.isA;
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+class SubqueryExpressionSegmentBinderTest {
+
+    @Test
+    public void testBind() {
+        SelectStatement selectStatement = new SQLServerSelectStatement();
+        selectStatement.setProjections(new ProjectionsSegment(0, 0));
+        SubquerySegment subquery = new SubquerySegment(0, 10, selectStatement, "subquery");
+        SubqueryExpressionSegment segment = new SubqueryExpressionSegment(subquery);
+        SQLStatementBinderContext statementBinderContext = new SQLStatementBinderContext(null, null, null, null);
+        Map<String, TableSegmentBinderContext> tableBinderContexts = new HashMap<>();
+        SubqueryExpressionSegment expected = new SubqueryExpressionSegment(SubquerySegmentBinder.bind(segment.getSubquery(), statementBinderContext, tableBinderContexts));
+        SubqueryExpressionSegment actual = SubqueryExpressionSegmentBinder.bind(segment, statementBinderContext, tableBinderContexts);
+        assertThat(actual, isA(SubqueryExpressionSegment.class));
+        assertThat(actual.getStartIndex(), is(expected.getStartIndex()));
+        assertThat(actual.getStopIndex(), is(expected.getStopIndex()));
+        assertThat(actual.getText(), is(expected.getText()));
+        assertThat(actual.getSubquery().getStartIndex(), is(expected.getSubquery().getStartIndex()));
+        assertThat(actual.getSubquery().getStopIndex(), is(expected.getSubquery().getStopIndex()));
+        assertThat(actual.getSubquery().getSubqueryType(), is(expected.getSubquery().getSubqueryType()));
+        assertThat(actual.getSubquery().getText(), is(expected.getSubquery().getText()));
+        assertThat(actual.getSubquery().getSelect().getDatabaseType(), is(expected.getSubquery().getSelect().getDatabaseType()));
+        assertThat(actual.getSubquery().getSelect().getProjections().getProjections(), is(expected.getSubquery().getSelect().getProjections().getProjections()));
+    }
+}