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PowerMock and MockWebServer do not play well together

See original GitHub issue

This is with mockwebserver 3.4.1, powermock 1.5.1 and Kotlin 1.1.0. This is the test:

@RunWith(PowerMockRunner::class)
@PrepareForTest(String::class)
class MyTest {
    companion object {
        private val server = MockWebServer().apply { start() }

        @AfterClass
        fun tearDown(){
            server.shutdown()
        }
    }

    @Test
    fun someTest(){
    }
}

Which results in:

Exception in thread "main" java.lang.AssertionError
	at okhttp3.OkHttpClient.systemDefaultTrustManager(OkHttpClient.java:260)
	at okhttp3.OkHttpClient.<init>(OkHttpClient.java:228)
	at okhttp3.OkHttpClient.<init>(OkHttpClient.java:203)
	at okhttp3.internal.Internal.initializeInstanceForTests(Internal.java:41)
	at okhttp3.mockwebserver.MockWebServer.<clinit>(MockWebServer.java:104)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at javassist.runtime.Desc.getClassObject(Desc.java:43)
	at javassist.runtime.Desc.getClassType(Desc.java:152)
	at javassist.runtime.Desc.getType(Desc.java:122)
	at javassist.runtime.Desc.getType(Desc.java:78)
	at com.mycompany.MyTest.<clinit>(MyTest.kt:30)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.createTestInstance(PowerMockJUnit44RunnerDelegateImpl.java:186)
	at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.createTest(PowerMockJUnit44RunnerDelegateImpl.java:171)
	at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:193)
	at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:146)
	at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
	at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:33)
	at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:45)
	at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:118)
	at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:101)
	at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
	at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:53)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:237)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)