Can we mock constructor and check its parameters?

Question

With mockk, to mock constructors, we can do something like (taken from documentation):

class MockCls {
  fun add(a: Int, b: Int) = a + b
}

mockkConstructor(MockCls::class)

every { anyConstructed<MockCls>().add(1, 2) } returns 4

assertEquals(4, MockCls().add(1, 2)) // note new object is created

verify { anyConstructed<MockCls>().add(1, 2) }

I'd like to check on the parameters of my constructor. Something like:

class MockCls(val minValue: Int) {
  fun add(a: Int, b: Int) = minValue + a + b
}

mockkConstructor(MockCls::class)

every { anyConstructed<MockCls>(10).add(1, 2) } returns 14

assertEquals(14, MockCls(10).add(1, 2)) // note new object is created

verify { anyConstructed<MockCls>(10).add(1, 2) } // success
verify { anyConstructed<MockCls>(5).add(1, 2) } // fail

I didn't find any way to check constructor parameters right now.

Please submit feature request to GH issues – oleksiyp Dec 23 '18 at 22:01 — oleksiyp, Dec 23 '18 at 22:01
Done here https://github.com/mockk/mockk/issues/209 – Happy Dec 29 '18 at 10:24 — Happy, Dec 29 '18 at 10:24

score 1 · Answer 1 · answered Feb 24 '23 at 23:47

1

This is now a feature in Mockk starting from 1.11.0.

mockkConstructor(MockCls::class)

// ...

verify { constructedWith<MockCls>(10).add(1, 2) } 
verify { constructedWith<MockCls>(5).add(1, 2)  }

See Mockk - Constructor mocks.

answered Feb 24 '23 at 23:47

u-ways

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Which seems to be introduced as a result of [your feature request](https://github.com/mockk/mockk/issues/209). – u-ways Feb 24 '23 at 23:49

score 0 · Answer 2 · answered Mar 31 '20 at 19:53

0

Unfortunately, it is currently not possible, as shown in the feature request you kindly made.

answered Mar 31 '20 at 19:53

Ellen Spertus

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1

feature request closed with fix in 1.11.0 – Eugene Krivenja Apr 30 '21 at 14:19

Can we mock constructor and check its parameters?

2 Answers2