模拟方法返回null [英] Mocking a method returns null

问题描述

我有以下方法

  public ResultScanner getScanner（Scan scan）{
 Table table = getTableInstance（ Sampletable）； 
 return table.getScanner（scan）; 
} 
  

为此，我编写了以下junit测试代码

 连接模拟连接= PowerMockito.mock（Connection.class）; 
表模拟表= PowerMockito.mock（Table.class）; 
 PowerMockito.when（mockconnection.getTable（TableName.valueOf（Mockito.anyString（））））
 .thenReturn（mocktable）; 
 
扫描mockedScan = PowerMockito.mock（Scan.class）; 
 ResultScanner模拟者= PowerMockito.mock（ResultScanner.class）; 
 PowerMockito.when（mocktable.getScanner（mockedScan））。thenReturn（mockrs）; 
  

在测试方法时

语句

  Table table = getTableInstance（ Sampletable）; 
  

运行良好并给出了模拟表对象，但语句

  table.getScanner（scan）; 
  

返回空值。

请找到以下链接中的Table界面的源代码

http://grepcode.com/file/repo1.maven.org/maven2/ org.apache.hbase / hbase-client / 1.1.1 / org / apache / hadoop / hbase / client / Table.java

请引导我

解决方案

用

<$ p代替测试用例的最后一行$ p> PowerMockito.when（mocktable.getScanner（Mockito.any（Scan.class）））。thenReturn（mockrs）;


应该可以工作

I have the following method

public ResultScanner getScanner(Scan scan) {
    Table table = getTableInstance("Sampletable");
    return table.getScanner(scan);
}

For this I have written following junit test code

Connection mockconnection = PowerMockito.mock(Connection.class);
Table mocktable = PowerMockito.mock(Table.class);
PowerMockito.when(mockconnection.getTable(TableName.valueOf(Mockito.anyString())))
    .thenReturn(mocktable);

Scan mockedScan = PowerMockito.mock(Scan.class);
ResultScanner mockrs = PowerMockito.mock(ResultScanner.class);
PowerMockito.when(mocktable.getScanner(mockedScan)).thenReturn(mockrs);

while testing the method

the statement

Table table = getTableInstance("Sampletable");

runs fine and gives the mocked table object but the statement

table.getScanner(scan);

returns null.

Please find the source code for Table interface in the below link

http://grepcode.com/file/repo1.maven.org/maven2/org.apache.hbase/hbase-client/1.1.1/org/apache/hadoop/hbase/client/Table.java

Please guide me in this??

解决方案

Replace last line of test case with

 PowerMockito.when(mocktable.getScanner(Mockito.any(Scan.class))).thenReturn(mockrs);

It should work

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