<Kotlin Mockk what is the difference between `just...

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Kotlin Mockk what is the difference between `just runs` and `answer {}`?
Given a function foo of an object Bar:
fun foo(){
// some logic
}

Using Mockk, in the test of an object that uses Bar, I often see answers {} to specify (with every) the return of foo:
internal class FooBarTest {
private val barMock = mockk()

// ...
@Test
fun `test something`() = runTest {
every { barMock.foo() } answers {}
//...
}
}

I would have used just runs, and using just runs in this situation instead of answers {} works fine.
What is the...