So far I have

runBlockingTest {
            whenever(model.loadData(false)).thenThrow(DeprecatedApiException())

Try with

whenever(model.loadData(eq(false))).thenThrow(DeprecatedApiException())

When stubbing a function with parameters, you need to wrap expected parameters in

eq(...)

, that's a Mockito trick. Tell me if that solved the problem !

@tseisel when I enter the code you posted, I get:

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: 
Invalid use of argument matchers!
2 matchers expected, 1 recorded:
-> at com.nhaarman.mockito_kotlin.MockitoKt.eq(Mockito.kt:114)

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"));

For more info see javadoc for Matchers class.

When compiled,

suspend

functions are translated to a regular function with an additional

Continuation

parameter. Older Mockito versions are not aware of that and therefore are unable to properly mock suspending functions. Suspend functions are supported from version 2.23, check if the version you use is 2.23 or newer