content: /*
   * Copyright 2020 Alibaba Group Holding Limited.
   *
   * Licensed 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 com.alibaba.graphscope.common.ir;
  
  import com.alibaba.graphscope.common.ir.tools.GraphBuilder;
  import com.alibaba.graphscope.common.ir.tools.config.*;
  
  import org.junit.Assert;
  import org.junit.Test;
  
  public class GetVTest {
      // source("person").as("x").expand("knows").as("y").getV("person").as("x") -> invalid
      @Test
      public void getV_1_test() {
          GraphBuilder builder = Utils.mockGraphBuilder();
          try {
              builder.source(
                              new SourceConfig(
                                      GraphOpt.Source.VERTEX,
                                      new LabelConfig(false).addLabel("person"),
                                      "x"))
                      .expand(
                              new ExpandConfig(
                                      GraphOpt.Expand.OUT,
                                      new LabelConfig(false).addLabel("knows"),
                                      "y"))
                      .getV(
                              new GetVConfig(
                                      GraphOpt.GetV.END,
                                      new LabelConfig(false).addLabel("person"),
                                      "x"))
                      .build();
          } catch (IllegalArgumentException e) {
              // expected error
              return;
          }
          Assert.fail("should have thrown error for duplicated alias");
      }
  }
  