title: getting error Missing calls inside every { ... } block in writing unit test cases in kotlin + Mockk + Junit5
body: <p>the function I am testing,</p>
  
  <pre><code>class FileUtility {
      companion object {
          @JvmStatic
          fun deleteFile(filePath: String) {
              try {
                  val file = getFileObject(filePath)
                  file.delete()
              } catch (ex :Exception) {
                  log.error("Exception while deleting the file", ex)
              }
          }
      }
  }
  </code></pre>
  
  <p>Unit test,</p>
  
  <pre><code>@Test
  fun deleteFileTest() {
      val filePath = "filePath"
      val file = mockk&lt;File&gt;()
      every { getFileObject(filePath) } returns file
      deleteFile(filePath)
      verify { file.delete() }
  }
  </code></pre>
  
  <p>getting the following error on running this test case</p>
  
  <pre><code> io.mockk.MockKException: Missing calls inside every { ... } block.
  </code></pre>
  
  <p>is this any bug or am I writing wrong test case?</p>