Kotlinで静的メソッドをモックする方法は？

Question

私はKotlinにjMockitと静的メソッドを模擬しようとしている：

object: MockUp<System>() { 
    @Mock 
    fun getProperty(name: String) = "tagB" 
} 

しかし、私は次のエラーを取得する：期待ブロックと

Could not load Logmanager "tagB" java.lang.ClassNotFoundException: tagB at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.util.logging.LogManager$1.run(LogManager.java:195) at java.util.logging.LogManager$1.run(LogManager.java:181) at java.security.AccessController.doPrivileged(Native Method) at java.util.logging.LogManager.(LogManager.java:181) at java.util.logging.Logger.getPlatformLogger(Logger.java:572) at java.util.logging.LoggingProxyImpl.getLogger(LoggingProxyImpl.java:41) at sun.util.logging.LoggingSupport.getLogger(LoggingSupport.java:100) at sun.util.logging.PlatformLogger$JavaLoggerProxy.(PlatformLogger.java:602) at sun.util.logging.PlatformLogger$JavaLoggerProxy.(PlatformLogger.java:597) at sun.util.logging.PlatformLogger.(PlatformLogger.java:239) at sun.util.logging.PlatformLogger.getLogger(PlatformLogger.java:198) at sun.util.locale.provider.LocaleServiceProviderPool.config(LocaleServiceProviderPool.java:142) at sun.util.locale.provider.LocaleProviderAdapter.(LocaleProviderAdapter.java:165) at java.text.DecimalFormatSymbols.getInstance(DecimalFormatSymbols.java:178) at java.util.Formatter.getZero(Formatter.java:2283) at java.util.Formatter.(Formatter.java:1892) at java.util.Formatter.(Formatter.java:1914) at java.lang.String.format(String.java:2940) at org.junit.runner.Description.formatDisplayName(Description.java:114) at org.junit.runner.Description.createTestDescription(Description.java:73) at io.kotlintest.TestCase.getDescription(testcase.kt:45) at io.kotlintest.TestBase.descriptionForSuite$kotlintest_main(TestBase.kt:153) at io.kotlintest.TestBase.getDescription$kotlintest_main(TestBase.kt:39) at io.kotlintest.KTestJUnitRunner.getDescription(KTestJUnitRunner.kt:11) at com.intellij.junit4.JUnit4IdeaTestRunner.getDescription(JUnit4IdeaTestRunner.java:123) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:99) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144) Logging configuration class "tagB" failed java.lang.ClassNotFoundException: tagB ...

他のアプローチは、あまりにも、ない成功しました。

私はKotlinで静的メソッドをモックできますか？

Answer 1

あなたは、このようなシステムを模擬する必要があります、それはあなたが明示的にAPIを通じて `System.getProperty`を通じてアクセスしているどのような値を渡すことができますように

class MockSystem : MockUp<System>() { 
    @Mock 
    fun getProperty(name: String) = "tagB" 
} 


class MockTest { 

    val m = MockSystem(); 

    @Test fun test() { 
     Assert.assertEquals(System.getProperty("hello"), "tagB") 
    } 
}