diff --git a/cffu-core/src/test/java/io/foldright/cffu/CompletableFutureUtilsTest.java b/cffu-core/src/test/java/io/foldright/cffu/CompletableFutureUtilsTest.java
index 43c37fd3..9ae72600 100644
--- a/cffu-core/src/test/java/io/foldright/cffu/CompletableFutureUtilsTest.java
+++ b/cffu-core/src/test/java/io/foldright/cffu/CompletableFutureUtilsTest.java
@@ -1026,56 +1026,6 @@ void test_completableFutureListToArray() {
         assertArrayEquals(input, CompletableFutureUtils.completableFutureListToArray(Arrays.asList(input)));
     }
 
-    ////////////////////////////////////////////////////////////////////////////////
-    //# check type parameter declaration, Variance(covariance/contravariance)
-    ////////////////////////////////////////////////////////////////////////////////
-
-    @Test
-    @SuppressWarnings({"UnnecessaryLocalVariable", "unused"})
-    void checkTypeParameterDeclaration_peek_completeAsync() throws Exception {
-        final CompletableFuture<Integer> f = completedFuture(42);
-        final CompletableFuture<? extends Integer> fe = f;
-        final CompletableFuture<? super Integer> fs = f;
-        final CompletableFuture<?> fq = f;
-
-        final BiConsumer<? super Integer, Throwable> c = (v, ex) -> {
-        };
-        CompletableFutureUtils.peek(fe, c).get();
-        CompletableFutureUtils.peekAsync(fe, c).get();
-        CompletableFutureUtils.peekAsync(fe, c, executorService).get();
-
-        final Supplier<? extends Integer> s = () -> 0;
-        fs.complete(0);
-        CompletableFutureUtils.completeAsync(fs, s).complete(1);
-        CompletableFutureUtils.completeAsync(fs, s, executorService).complete(1);
-
-        CompletableFuture<? extends Integer> ffe = orTimeout(fe, 1, TimeUnit.MILLISECONDS);
-        CompletableFuture<? super Integer> ffs = orTimeout(fs, 1, TimeUnit.MILLISECONDS);
-        CompletableFuture<?> ffq = orTimeout(fq, 1, TimeUnit.MILLISECONDS);
-    }
-
-    @Test
-    @EnabledForJreRange(min = JRE.JAVA_19)
-    @SuppressWarnings({"UnnecessaryLocalVariable", "unused", "RedundantThrows"})
-    void checkTypeParameterDeclaration_resultNow() throws Exception {
-        final CompletableFuture<Integer> f = completedFuture(42);
-        final CompletableFuture<? extends Integer> fe = f;
-        final CompletableFuture<? super Integer> fs = f;
-        final CompletableFuture<?> fq = f;
-
-        Integer i = f.resultNow();
-        Integer ii = resultNow(f);
-
-        Integer ie = fe.resultNow();
-        Integer iie = resultNow(fe);
-
-        Object is = fs.resultNow();
-        Object iis = resultNow(fs);
-
-        Object iq = fq.resultNow();
-        Object iiq = resultNow(fq);
-    }
-
     ////////////////////////////////////////////////////////////////////////////////
     //# test helper fields
     ////////////////////////////////////////////////////////////////////////////////
diff --git a/cffu-kotlin/src/test/java/io/foldright/cffu/generics/TypeParameterDeclarationTest.java b/cffu-kotlin/src/test/java/io/foldright/cffu/generics/TypeParameterDeclarationTest.java
new file mode 100644
index 00000000..17d0671f
--- /dev/null
+++ b/cffu-kotlin/src/test/java/io/foldright/cffu/generics/TypeParameterDeclarationTest.java
@@ -0,0 +1,76 @@
+package io.foldright.cffu.generics;
+
+import io.foldright.cffu.CompletableFutureUtils;
+import io.foldright.test_utils.TestThreadPoolManager;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.TimeUnit;
+import java.util.function.BiConsumer;
+import java.util.function.Supplier;
+
+import static io.foldright.cffu.CompletableFutureUtils.orTimeout;
+import static io.foldright.cffu.CompletableFutureUtils.resultNow;
+import static java.util.concurrent.CompletableFuture.completedFuture;
+
+
+/**
+ * Checks type parameter declaration, Variance(covariance/contravariance)
+ */
+@SuppressWarnings({"UnnecessaryLocalVariable", "unused", "RedundantThrows"})
+public class TypeParameterDeclarationTest {
+
+    private static final CompletableFuture<Integer> f = completedFuture(42);
+    private static final CompletableFuture<? extends Integer> fe = f;
+    private static final CompletableFuture<? super Integer> fs = f;
+    private static final CompletableFuture<?> fq = f;
+
+    @Test
+    void checkTypeParameterDeclaration_peek_completeAsync() throws Exception {
+        final BiConsumer<? super Integer, Throwable> c = (v, ex) -> {
+        };
+        CompletableFutureUtils.peek(fe, c).get();
+        CompletableFutureUtils.peekAsync(fe, c).get();
+        CompletableFutureUtils.peekAsync(fe, c, executorService).get();
+
+        final Supplier<? extends Integer> s = () -> 0;
+        fs.complete(0);
+        CompletableFutureUtils.completeAsync(fs, s).complete(1);
+        CompletableFutureUtils.completeAsync(fs, s, executorService).complete(1);
+
+        CompletableFuture<? extends Integer> ffe = orTimeout(fe, 1, TimeUnit.MILLISECONDS);
+        CompletableFuture<? super Integer> ffs = orTimeout(fs, 1, TimeUnit.MILLISECONDS);
+        CompletableFuture<?> ffq = orTimeout(fq, 1, TimeUnit.MILLISECONDS);
+    }
+
+    @Test
+    void checkTypeParameterDeclaration_resultNow() throws Exception {
+        Integer ii = resultNow(f);
+        Integer iie = resultNow(fe);
+        Object iis = resultNow(fs);
+        Object iiq = resultNow(fq);
+    }
+
+    @Test
+    void checkTypeParameterDeclaration_get() throws Exception {
+        Integer i = f.get();
+        Integer ie = fe.get();
+        Object is = fs.get();
+        Object iq = fq.get();
+    }
+
+    private static ExecutorService executorService;
+
+    @BeforeAll
+    static void beforeAll() {
+        executorService = TestThreadPoolManager.createThreadPool("TypeParameterDeclarationTest");
+    }
+
+    @AfterAll
+    static void afterAll() {
+        TestThreadPoolManager.shutdownExecutorService(executorService);
+    }
+}