error debugging when mockking an interface that im...

# mockk

[Nick]

error debugging when mockking an interface that implements Iterable. wondering if this is a known bug and if there's any work-around.

private interface Fails: Iterable<Int>

@Test fun `fails debug`() {
    mockk<Fails> {} // <----------- Just doing this results in the following exception
}

class redefinition failed: attempted to change the schema (add/remove fields)
java.lang.UnsupportedOperationException: class redefinition failed: attempted to change the schema (add/remove fields)
	at java.instrument/sun.instrument.InstrumentationImpl.retransformClasses0(Native Method)
	at java.instrument/sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:169)
	at io.mockk.proxy.jvm.transformation.JvmInlineInstrumentation.retransform(JvmInlineInstrumentation.kt:28)
	at io.mockk.proxy.common.transformation.RetransformInlineInstrumentation$doCancel$1.invoke(RetransformInlineInstrumentation.kt:38)
	at io.mockk.proxy.common.transformation.RetransformInlineInstrumentation$doCancel$1.invoke(RetransformInlineInstrumentation.kt:32)
	at io.mockk.proxy.common.transformation.ClassTransformationSpecMap.applyTransformation(ClassTransformationSpecMap.kt:41)
	at io.mockk.proxy.common.transformation.RetransformInlineInstrumentation.doCancel(RetransformInlineInstrumentation.kt:32)
	at io.mockk.proxy.common.transformation.RetransformInlineInstrumentation.access$doCancel(RetransformInlineInstrumentation.kt:6)
	at io.mockk.proxy.common.transformation.RetransformInlineInstrumentation$execute$1$1.invoke(RetransformInlineInstrumentation.kt:17)
	at io.mockk.proxy.common.transformation.RetransformInlineInstrumentation$execute$1$1.invoke(RetransformInlineInstrumentation.kt:17)
	at io.mockk.proxy.common.transformation.RetransformInlineInstrumentation.execute(RetransformInlineInstrumentation.kt:23)
	at io.mockk.proxy.jvm.ProxyMaker.inline(ProxyMaker.kt:90)
	at io.mockk.proxy.jvm.ProxyMaker.proxy(ProxyMaker.kt:34)
	at io.mockk.impl.instantiation.JvmMockFactory.newProxy(JvmMockFactory.kt:34)
	at io.mockk.impl.instantiation.AbstractMockFactory.newProxy$default(AbstractMockFactory.kt:24)
	at io.mockk.impl.instantiation.AbstractMockFactory.mockk(AbstractMockFactory.kt:59)

[William Reed]

@Nick did you ever figure this one out?

[Nick]

i didn’t. i think i just worked around it.