MINOR: Rewrite unchecked operations in Mock API

[clarkwtc]

We encountered unchecked or unsafe operations in GroupMetadataManagerTest.java and KTableImplTest.java.

• Rewrite getArgument of invocation in InvocationOnMock API because the implementation of InvocationOnMock discards type anyway.

  • Before
  
  • After
  

• Remove unchecked annotations for using mock API without variable assignment.

Follow-up: mockito/mockito#1609

[m1a2st]

Thank @clarkwtc for this patch, left a comment

[m1a2st]

I use ./gradlew clean build -x test command on this branch, It still have the warning message

[clarkwtc]

Thank you for checking again.
I’ve fixed it.

[frankvicky]

Why change the type to var keyword?

[clarkwtc]

Why change the type to var keyword?

@frankvicky

This change is meant to resolve the unchecked cast for KTableImpl.

[frankvicky]

@clarkwtc
I don't think it must use var.
For example:

    @Test
    public void testStateStore() {
        final StreamsBuilder builder = new StreamsBuilder();
        final String topic1 = "topic1";
        final String topic2 = "topic2";

        final KTable<String, String> table1 = builder.table(topic1, consumed);
        final KTable<String, String> table2 = builder.table(topic2, consumed);

        final KTable<String, Integer> table1Mapped = table1.mapValues(s -> Integer.valueOf(s));
        final KTable<String, Integer> table1MappedFiltered = table1Mapped.filter((key, value) -> (value % 2) == 0);
        table2.join(table1MappedFiltered, (v1, v2) -> v1 + v2);

        try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
            assertEquals(2, driver.getAllStateStores().size());
        }
    }

In this way, there will be no warning during the build.