Ufdjrw

I'm trying to spy restTemplate and I wanna to stub 'exchange' method

Here is some code:

spying class

@Bean
 fun mockedRestTemplate(): RestTemplate = Mockito.spy(RestTemplate::class.java)

another class

 val headers = HttpHeaders()
 headers.setBasicAuth(UUID.randomUUID().toString(), UUID.randomUUID().toString())

 val responseBody = "some error message"

 val ex = HttpClientErrorException.create(
 HttpStatus.NOT_FOUND,
 "random",
 headers,
 responseBody.toByteArray(),
 Charset.defaultCharset()
 )

 val httpEntity = HttpEntity(Any(), headers)

 Mockito.doThrow(ex).`when`(restTemplate).exchange(
 any() ?: config.randomEndpoint,
 any(HttpMethod::class.java) ?: HttpMethod.POST,
 any() ?: httpEntity,
 any() ?: Foo::class.java
 )

What might I be doing wrong here? I get this error message:

 org.mockito.exceptions.misusing.InvalidUseOfMatchersException: 
Invalid use of argument matchers!
0 matchers expected, 1 recorded:
-> at test.suites.controller.FooTest.canGetFailedErrorFieldsIfApiRejectsRequest(FooTest.kt:468)

This exception may occur if matchers are combined with raw values:
 //incorrect:
 someMethod(anyObject(), "raw String");
When using matchers, all arguments have to be provided by matchers.
For example:
 //correct:
 someMethod(anyObject(), eq("String by matcher"));

When I'm mocking/spying another classes, it works fine

Matchers, such as any(), must be used only in verify() calls. You have:

val httpEntity = HttpEntity(Any(), headers)

You can't use any() in this context as you are constructing an object, not verifying a method call. You need to pass in an actual value here.

Side note: spy() is intended to wrap a real instance. If you're just mocking out an interface (RestTemplate) you should likely be using mock(RestTemplate::class.java) instead.

I found the problem, but I still didn't get the reason. The issue was in config.randomEndpoint. When I changed the value to string type without injecting config class, the error disappeared.