我可以在 groovy 中使用映射强制来模拟具有带参数的构造函数的类吗？

Posted 2023-02-18

【中文标题】我可以在 groovy 中使用映射强制来模拟具有带参数的构造函数的类吗？

【英文标题】：Can I use map coercion in groovy to mock a class with a constructor that has parameters?

【发布时间】：2010-10-10 16:10:19

【问题描述】：

正在测试的 Java 示例类

public class Sample 
    public void printPie() 
        System.out.println("Pie.");
    


public class SampleCont 
    String _PIE;

    public SampleCont() 
        _PIE = "pie";
    
    public void printPie() 
        System.out.println(_PIE);
    



public class SampleContArg 
    String _PIE;

    public SampleContArg(String pie) 
        _PIE = pie;
    
    public void printPie() 
        System.out.println(_PIE);
    

常规测试类

public class TestPie extends GroovyTestCase

    void test_Sample()
    
        def mock = [printPie: print "NotPie"] as Sample
        mock.printPie()
    

    void test_SampleCont()
    
        def mock = [printPie: print "NotPie"] as SampleCont
        mock.printPie()
    

    void test_SampleContArg()
    
        def mock = [printPie: print "NotPie"] as SampleContArg
        mock.printPie()
    

前两个测试编译并运行良好。后一个测试由于异常而没有运行：

java.lang.ArrayIndexOutOfBoundsException: 0
    at SampleContArg_groovyProxy.<init>(Script1.groovy:4)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.codehaus.groovy.runtime.MetaClassHelper.doConstructorInvoke(MetaClassHelper.java:595)
    at groovy.lang.MetaClassImpl.doConstructorInvoke(MetaClassImpl.java:2359)
    at groovy.lang.MetaClassImpl.invokeConstructor(MetaClassImpl.java:1255)
    at groovy.lang.MetaClassImpl.invokeConstructor(MetaClassImpl.java:1185)
    at org.codehaus.groovy.runtime.InvokerHelper.invokeConstructorOf(InvokerHelper.java:809)
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeNewN(ScriptBytecodeAdapter.java:230)
    at Script1.run(Script1.groovy:9)
    at groovy.lang.GroovyShell.evaluate(GroovyShell.java:543)
    at groovy.lang.GroovyShell.evaluate(GroovyShell.java:518)
    at groovy.util.ProxyGenerator.instantiateAggregate(ProxyGenerator.java:201)
    at groovy.util.ProxyGenerator.instantiateAggregateFromBaseClass(ProxyGenerator.java:70)
    at groovy.util.ProxyGenerator.instantiateAggregateFromBaseClass(ProxyGenerator.java:66)
    at org.codehaus.groovy.runtime.DefaultGroovyMethods.asType(DefaultGroovyMethods.java:3811)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.codehaus.groovy.runtime.metaclass.ReflectionMetaMethod.invoke(ReflectionMetaMethod.java:51)
    at org.codehaus.groovy.runtime.metaclass.NewInstanceMetaMethod.invoke(NewInstanceMetaMethod.java:54)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:230)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:912)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:756)
    at org.codehaus.groovy.runtime.InvokerHelper.invokePojoMethod(InvokerHelper.java:766)
    at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:754)
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:170)
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.asType(ScriptBytecodeAdapter.java:622)
    at com.hp.vse.cp.cli.agentless.ssh.TestPie.test_SampleContArg(TestPie.groovy:24)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at junit.framework.TestCase.runTest(TestCase.java:154)
    at junit.framework.TestCase.runBare(TestCase.java:127)
    at junit.framework.TestResult$1.protect(TestResult.java:106)
    at junit.framework.TestResult.runProtected(TestResult.java:124)
    at junit.framework.TestResult.run(TestResult.java:109)
    at junit.framework.TestCase.run(TestCase.java:118)
    at junit.framework.TestSuite.runTest(TestSuite.java:208)
    at junit.framework.TestSuite.run(TestSuite.java:203)
    at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)

在上面第三个类的情况下，我还可以使用groovy map coercion来模拟这个类吗？如果是这样，我做错了什么？

【参考方案1】：

ProxyGenerator.instantiateAggregateFromBaseClass 方法可以接受构造函数参数。但不幸的是， as 运算符不会为您调用它。

所以，目前的答案是否定的。

仅供参考，“as”将调用 DefaultGroovyMethods.asType() 方法之一，但它们都不会调用您想要的 instantiateAggregateFromBaseClass。

【讨论】：

作为这个问题的扩展。我们可以使用闭包强制来实现使用参数的模拟方法吗？