#1872: Add unnecessary warning suppression in test classes.

Author: yegor256

src/test/java/org/cactoos/experimental/ThreadsTest.java

@@ -23,7 +23,7 @@
  *
  * @since 1.0.0
  */
-@SuppressWarnings({"PMD.AvoidDuplicateLiterals", "PMD.CloseResource"})
+@SuppressWarnings({"PMD.AvoidDuplicateLiterals", "PMD.CloseResource", "PMD.UnnecessaryWarningSuppression"})
 final class ThreadsTest {
 
     /**

src/test/java/org/cactoos/func/AsyncTest.java

@@ -23,7 +23,7 @@
  * @since 0.10
  * @checkstyle JavadocMethodCheck (500 lines)
  */
-@SuppressWarnings({"PMD.CloseResource", "PMD.UnnecessaryLocalRule"})
+@SuppressWarnings({"PMD.CloseResource", "PMD.UnnecessaryLocalRule", "PMD.UnnecessaryWarningSuppression"})
 final class AsyncTest {
     @Test
     void runsInBackground() {

src/test/java/org/cactoos/scalar/AndInThreadsTest.java

@@ -25,7 +25,7 @@
  * Test case for {@link AndInThreads}.
  * @since 0.25
  */
-@SuppressWarnings({"unchecked", "PMD.TooManyMethods", "PMD.CloseResource"})
+@SuppressWarnings({"unchecked", "PMD.TooManyMethods", "PMD.CloseResource", "PMD.UnnecessaryWarningSuppression"})
 final class AndInThreadsTest {
 
     @Test