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I'm trying to mock a static method with jMockit in Kotlin:
object: MockUp<System>() {
@Mock
fun getProperty(name: String) = "tagB"
}
But I get the following error:
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 ...
Other approaches with expectations blocks weren't successful, too.
How can I mock a static method in Kotlin?
328
Since static method belongs to the class, there is no way in Mockito to mock static methods. However, we can use PowerMock along with Mockito framework to mock static methods.
The powerful capabilities of the feature-rich JustMock framework allow you to mock static classes and calls to static members like methods and properties, set expectations and verify results. This feature is a part of the fastest, most flexible and complete mocking tool for crafting unit tests.
Android Dependency Injection using Dagger with Kotlin In Java, once a method is declared as "static", it can be used in different classes without creating an object. With static methods, we don't have to create the same boilerplate code for each and every class.
Mocking static methodsRather than passing a reference to the class, you pass the class name as a string. You can also choose to pass in a reference to the class, and MockK will figure out the class name. Like object mocks, static mocks behave like spies. The real method will be called if the method is not stubbed.
You should mock System like this:
class MockSystem : MockUp<System>() {
@Mock
fun getProperty(name: String) = "tagB"
}
class MockTest {
val m = MockSystem();
@Test fun test() {
Assert.assertEquals(System.getProperty("hello"), "tagB")
}
}
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