@InjectMock replaces existing mocks

[snowdrop-bot]

Describe the bug Basically what I have is class C1, which implements 2 interfaces I1 and I2. Class C2 then injects those 2 interfaces. The actual (non-test) code runs well, but in testing one of the mocks is not called.

It will probably be the simplest to understand with some pseudo code, as I have a hard time explaining the problem with words.

class C1 implements I1, I2 {...}

class C2 {
  @Inject I1
  @Inject I2

  method() {
    I1.m1()
    I2.m2()
  }
}

@QuarkusTest
class Test {
  @Inject C2
  @MockInject I1
  @MockInject I2

  @Test
  test() {
    when(I1)...
    when(I2)...

    C2.method()

    verify(I1) - NOT CALLED
    verify(I2) - CALLED
  }
}

From what I understand what happens is that the mocks replace the actual implementation, but that does not seem correct to me, because the implementation is not what I really want to mock or worry about.

Now... Does this qualify as a bug, or is it a "feature"? Is there some workaround except just creating interfaces that are the "same" as implementations (one interface per class)?

Expected behavior Both mock get called.

Actual behavior One mock gets called.

To reproduce

git clone https://github.com/blazmrak/inject-mock-issue.git mvn clean test

Environment (please complete the following information):

• Output of uname -a or ver: 10.0.19042.804
• Output of java -version: 11.0.10
• GraalVM version (if different from Java):
• Quarkus version or git rev: 1.12
• Build tool (ie. output of mvnw --version or gradlew --version): 3.6.3

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https://github.com/quarkusio/quarkus/issues/15411

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$upstream:15411$