Wrong value when mocking kotlin.Result

Prerequisites

Please answer the following questions for yourself before submitting an issue.

• I am running the latest version
• I checked the documentation and found no answer
• I checked to make sure that this issue has not already been filed

Failure Information (for bugs)

In mockk 1.12.4 I was able to mock a kotlin.Response return value on a function and get the generic value from it.

1.12.5 seems to have broken this and regardless of the Response.success(x) value, success always folds to a boolean false.

Code below.

Context

• MockK version: 1.12.5
• OS: macOS 11.5.2
• Kotlin version: 1.7.10
• JDK version: 11
• JUnit version: 4.13.2
• Type of test: unit test

Minimal reproducible code (the gist of this issue)

// -----------------------[ GRADLE DEFINITIONS ] -----------------------
dependencies {
    testImplementation("org.hamcrest:hamcrest-library:2.2")
    testImplementation("junit:junit:4.13.2")
    testImplementation("io.mockk:mockk:1.12.5")
}
// -----------------------[ YOUR CODE STARTS HERE ] -----------------------
import io.mockk.every
import io.mockk.mockk
import org.hamcrest.CoreMatchers.equalTo
import org.hamcrest.MatcherAssert.assertThat
import org.junit.Test

class ResultTest {
    interface ToMock {
        fun returnsResult(): kotlin.Result<String>
    }

    @Test
    fun `result value`() {
        val value = Result.success("something")
        val toMock = mockk<ToMock> {
            every { returnsResult() } returns value
        }
        // Expected: <Success(something)>
        //      but: was <Success(false)>
        assertThat(toMock.returnsResult(), equalTo(value))
    }
}
// -----------------------[ YOUR CODE ENDS HERE ] -----------------------

[pphilipp]

Seems like the issue comes back. I have the Result.failure(Exception()) which wrapped with Result.success(Result.failure(Exception())).

version io.mockk:mockk:1.13.2

[qoomon]

It was fixed with recent version 1.12.6