Mock static java methods using Mockk

问题:

We are currently working with java with kotlin project, slowly migrating the whole code to the latter.

Is it possible to mock static methods like Uri.parse() using Mockk?

How would the sample code look like?

回答1:

In addition to oleksiyp answer:

After mockk 1.8.1:

Mockk version 1.8.1 deprecated the solution below. After that version you should do:

@Before
fun mockAllUriInteractions() {
    mockkStatic(Uri::class)
    every { Uri.parse("http://test/path") } returns Uri("http", "test", "path")
}

mockkStatic will be cleared everytime it's called, so you don't need to unmock it anymore

---

DEPRECATED:

If you need that mocked behaviour to always be there, not only in a single test case, you can mock it using @Before and @After:

@Before
fun mockAllUriInteractions() {
    staticMockk<Uri>().mock()
    every { Uri.parse("http://test/path") } returns Uri("http", "test", "path")    //This line can also be in any @Test case
}

@After
fun unmockAllUriInteractions() {
    staticMockk<Uri>().unmock()
}

This way, if you expect more pieces of your class to use the Uri class, you may mock it in a single place, instead of polluting your code with .use everywhere.

回答2:

MockK allows mocking static Java methods. The main purpose for it is mocking of Kotlin extension functions, so it is not as powerful as PowerMock, but still does it's job even for Java static methods.

The syntax would be following:

staticMockk<Uri>().use {
    every { Uri.parse("http://test/path") } returns Uri("http", "test", "path")

    assertEquals(Uri("http", "test", "path"), Uri.parse("http://test/path"))

    verify { Uri.parse("http://test/path") }  
}

More details here: http://mockk.io/#extension-functions