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1.12.5 fails to `every` certain java classes

See original GitHub issue

I created a demo/minimal project here:

https://gitlab.com/knyttl/mockkdemo/-/tree/main

You can see the CI build with test failure here:

https://gitlab.com/knyttl/mockkdemo/-/jobs/2782097977

Feel free to change the build.gradle.kts mockk version to 1.12.4 which will test correctly.

Expected Behavior

The tests shouldn’t fail.

Current Behavior

The test fails with:

kotlin.reflect.jvm.internal.KotlinReflectionInternalError: Unresolved class: class org.elasticsearch.search.sort.SortOrder$1

As you can see in the CI run mentioned above.

Failure Information (for bugs)

See CI run mentioned above.

Steps to Reproduce

See the source code mentioned above. Feel free to change the version to 1.12.4 which will build correctly.

Context

Please provide any relevant information about your setup. This is important in case the issue is not reproducible except for under certain conditions.

MockK version: 1.12.5
Kotlin version: 1.7.10
JDK version: 17

Minimal reproducible code (the gist of this issue)

import io.mockk.every
import io.mockk.mockk
import org.elasticsearch.search.sort.SortOrder
import org.junit.jupiter.api.Test

class MockkDemo {
    @Test
    fun testMockk() {
        val repo = mockk<TestClass>()
        every { repo.getSchedules() } returns "Foo"
    }
}

class TestClass {
    fun getSchedules(sortOrder: SortOrder = SortOrder.ASC): String =
        sortOrder.toString()
}