diff --git a/implementation/src/test/java/io/smallrye/mutiny/operators/MultiConcatTest.java b/implementation/src/test/java/io/smallrye/mutiny/operators/MultiConcatTest.java
index aca2eea89..ffa68b7c5 100644
--- a/implementation/src/test/java/io/smallrye/mutiny/operators/MultiConcatTest.java
+++ b/implementation/src/test/java/io/smallrye/mutiny/operators/MultiConcatTest.java
@@ -2,7 +2,9 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+import java.io.IOException;
 import java.util.Arrays;
+import java.util.List;
 
 import org.junit.jupiter.api.Test;
 
@@ -160,4 +162,23 @@ public void testWithFailureCollection() {
                 .assertFailedWith(IllegalStateException.class, "boom");
 
     }
+
+    @Test
+    public void collectThreeFailures() {
+        List<IOException> failures = List.of(new IOException("foo"), new IOException("bar"), new IOException("baz"));
+        AssertSubscriber<String> sub = Multi.createBy().concatenating().collectFailures().streams(
+                Multi.createFrom().item("foo"),
+                Multi.createFrom().failure(failures.get(0)),
+                Multi.createFrom().item("bar"),
+                Multi.createFrom().failure(failures.get(1)),
+                Multi.createFrom().item("baz"),
+                Multi.createFrom().failure(failures.get(2))).subscribe()
+                .withSubscriber(AssertSubscriber.create(Long.MAX_VALUE));
+
+        sub.assertItems("foo", "bar", "baz");
+        sub.assertFailedWith(CompositeException.class);
+        CompositeException compositeException = (CompositeException) sub.getFailure();
+        assertThat(compositeException.getCauses()).hasSize(3);
+        assertThat(compositeException.getCauses()).containsExactlyElementsOf(failures);
+    }
 }
diff --git a/implementation/src/test/java/io/smallrye/mutiny/operators/multi/MultiConcatMapNoPrefetchTest.java b/implementation/src/test/java/io/smallrye/mutiny/operators/multi/MultiConcatMapNoPrefetchTest.java
index 18b6f74d0..5785c8793 100644
--- a/implementation/src/test/java/io/smallrye/mutiny/operators/multi/MultiConcatMapNoPrefetchTest.java
+++ b/implementation/src/test/java/io/smallrye/mutiny/operators/multi/MultiConcatMapNoPrefetchTest.java
@@ -1,6 +1,7 @@
 package io.smallrye.mutiny.operators.multi;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.awaitility.Awaitility.await;
 
 import java.time.Duration;
 import java.util.concurrent.CompletableFuture;
@@ -291,4 +292,34 @@ void testUpfrontCompletion() {
 
         sub.assertCompleted().assertHasNotReceivedAnyItem();
     }
+
+    @Test
+    void rejectBadRequests() {
+        Multi<Integer> multi = upstream.onItem().transformToMultiAndConcatenate(n -> Multi.createFrom().item(1));
+
+        AssertSubscriber<Integer> sub = multi.subscribe().withSubscriber(AssertSubscriber.create());
+        sub.request(0L);
+        sub.assertHasNotReceivedAnyItem().assertFailedWith(IllegalArgumentException.class,
+                "Invalid request number, must be greater than 0");
+
+        sub = multi.subscribe().withSubscriber(AssertSubscriber.create());
+        sub.request(-10L);
+        sub.assertHasNotReceivedAnyItem().assertFailedWith(IllegalArgumentException.class,
+                "Invalid request number, must be greater than 0");
+    }
+
+    @Test
+    void testCancellation() {
+        AtomicBoolean cancelled = new AtomicBoolean();
+        AssertSubscriber<Integer> sub = Multi.createFrom().ticks().every(Duration.ofMillis(100))
+                .onCancellation().invoke(() -> cancelled.set(true))
+                .onItem().transformToMultiAndConcatenate(tick -> Multi.createFrom().items(1, 2, 3))
+                .subscribe().withSubscriber(AssertSubscriber.create(Long.MAX_VALUE));
+        await().atMost(Duration.ofSeconds(3)).until(() -> sub.getItems().size() > 12);
+        sub.cancel();
+        await().atMost(Duration.ofSeconds(3)).until(cancelled::get);
+        assertThat(sub.isCancelled()).isTrue();
+        assertThat(sub.hasCompleted()).isFalse();
+        assertThat(sub.getItems()).contains(1, 2, 3);
+    }
 }