grails 单元测试 - java.lang.NullPointerException：无法在空对象上调用方法完成（）答案

【问题标题】：grails unit test - java.lang.NullPointerException: Cannot invoke method finish() on null objectgrails 单元测试 - java.lang.NullPointerException：无法在空对象上调用方法完成（）
【发布时间】：2013-11-06 20:09:09
【问题描述】：

我无法在 grails 中运行单元测试。我有一个TransactionController（也可以在github 获得）和方法transactionAnalytics，我想测试如下，

TransactionController.groovy

package eccount


import org.codehaus.groovy.grails.web.json.JSONObject
import org.springframework.dao.DataIntegrityViolationException
import grails.converters.JSON

class TransactionController {
   def transactionService

   def transactionAnalytics = {
       searchRequest = searchRequest ?: new SearchRequest(requestParams: new HashMap<String, String>())
       configureRequestParams()
       def responseBytes = transactionService.getSearchResponse(searchRequest)
       def jsonResponse
       if (responseBytes)
            jsonResponse = JSON.parse(responseBytes)
       else
           jsonResponse = new JSONObject()
       render jsonResponse as JSON
   }
 }

TransactionController#transactionAnalytics（also available at github）的对应测试如下，

TransactionControllerTests.groovy

package eccount



import org.junit.*
import grails.test.mixin.*

@TestFor(TransactionController)
class TransactionControllerTests {
    def INDEX_NAME = "gccount"

    void testTransactionAnalytics(){
        Map<String, String> params = new HashMap<String, String>()
        params.put("indexName",INDEX_NAME)
        //println params.get("indexName")
        //controller.params  = params
        controller.params.indexName  = "gccount"
        controller.transactionAnalytics()
        def jsonResponse = controller.response.json
        println jsonResponse
    }
}

当我运行控制器的方法时，我得到以下异常

prayag@prayag:/backup/gccount$ grails test-app TransactionController.transactionAnalytics
| Environment set to test.....

| Running 1 unit test...
| Failure:  Test mechanism
|  java.lang.NullPointerException: Cannot invoke method finish() on null object
    at org.junit.runner.notification.RunNotifier$2.notifyListener(RunNotifier.java:71)
    at org.junit.runner.notification.RunNotifier$SafeNotifier.run(RunNotifier.java:41)
    at org.junit.runner.notification.RunNotifier.fireTestRunFinished(RunNotifier.java:68)
    at _GrailsTest_groovy$_run_closure4.doCall(_GrailsTest_groovy:290)
    at _GrailsTest_groovy$_run_closure2.doCall(_GrailsTest_groovy:248)
    at _GrailsTest_groovy$_run_closure1_closure21.doCall(_GrailsTest_groovy:195)
    at _GrailsTest_groovy$_run_closure1.doCall(_GrailsTest_groovy:184)
    at TestApp$_run_closure1.doCall(TestApp.groovy:82)
| Completed 0 unit test, 1 failed in 2723ms

| Packaging Grails application.....
[scalaPlugin] Compiling Scala sources from plugins to /home/prayag/.grails/2.1.1/projects/cashless/plugin-classes
[scalaPlugin] Compiling Scala sources to /backup/gccount/target/classes
| Compiling 2 source files

Configuring Spring Security Core ...
... finished configuring Spring Security Core
sandbox user created
role created
stall created with a user
| Tests FAILED  - view reports in /backup/gccount/target/test-reports

同样，file:///backup/gccount/target/test-reports 没有任何报告。 无论如何，这里究竟是谁为空？

资源

9 Testing - Reference Documentation

http://mrhaki.blogspot.com/2010/04/grails-goodness-invoking-single-test.html

https://stackoverflow.com/a/3736549/432903

【问题讨论】：

标签： unit-testing grails

【解决方案1】：

尝试：

grails test-app TransactionController.testTransactionAnalytics

您忘记了方法名称前面的“测试”... 是的...看来，您不必将其写在类名中，但在方法名中您必须...

【讨论】：

【解决方案2】：

Grails Goodness: Invoking a Single Test Method 似乎发布了错误的信息，因为以下代码不起作用。

$ grails test-app TransactionController.transactionAnalytics

正确的应该是初始化transactionService

$ grails test-app TransactionControllerTests.testTransactionAnalytics

或

$ grails test-app TransactionController.testTransactionAnalytics

【讨论】：