Fix some unchecked warnings in tests

spring-integration-core/src/test/java/org/springframework/integration/config/ChainParserTests.java

@@ -292,7 +292,8 @@ public class ChainParserTests {
 		assertThat(testConsumer.getLastMessage()).isSameAs(successMessage);
 	}
 
-	@Test //INT-2275, INT-2958
+	@Test
+	@SuppressWarnings("unchecked")
 	public void chainWithLoggingChannelAdapter() {
 		LogAccessor logger = mock(LogAccessor.class);
 		final AtomicReference<Supplier<? extends CharSequence>> log = new AtomicReference<>();

spring-integration-mqtt/src/test/java/org/springframework/integration/mqtt/DownstreamExceptionTests.java

@@ -72,6 +72,7 @@ public class DownstreamExceptionTests {
 	private PollableChannel errors;
 
 	@Test
+	@SuppressWarnings("unchecked")
 	public void testNoErrorChannel() throws Exception {
 		service.n = 0;
 		LogAccessor logger = spy(TestUtils.getPropertyValue(noErrorChannel, "logger", LogAccessor.class));