diff --git a/buffer/src/test/java/io/netty/buffer/AdvancedLeakAwareByteBufTest.java b/buffer/src/test/java/io/netty/buffer/AdvancedLeakAwareByteBufTest.java
index 3e53729d83..9c828e4d86 100644
--- a/buffer/src/test/java/io/netty/buffer/AdvancedLeakAwareByteBufTest.java
+++ b/buffer/src/test/java/io/netty/buffer/AdvancedLeakAwareByteBufTest.java
@@ -46,7 +46,6 @@ public class AdvancedLeakAwareByteBufTest extends SimpleLeakAwareByteBufTest {
         composite.addComponent(true, leakAwareBuf);
         byte[] result = new byte[5];
         ByteBuf bb = composite.component(0);
-        System.out.println(bb);
         bb.readBytes(result);
         assertArrayEquals("world".getBytes(CharsetUtil.US_ASCII), result);
         composite.release();
diff --git a/resolver-dns/src/test/java/io/netty/resolver/dns/DnsNameResolverClientSubnetTest.java b/resolver-dns/src/test/java/io/netty/resolver/dns/DnsNameResolverClientSubnetTest.java
index 8523424268..21fcbf623f 100644
--- a/resolver-dns/src/test/java/io/netty/resolver/dns/DnsNameResolverClientSubnetTest.java
+++ b/resolver-dns/src/test/java/io/netty/resolver/dns/DnsNameResolverClientSubnetTest.java
@@ -49,7 +49,7 @@ public class DnsNameResolverClientSubnetTest {
                             new DefaultDnsOptEcsRecord(1024, 24,
                                                        SocketUtils.addressByName("157.88.0.0").getAddress())));
             for (InetAddress address: future.syncUninterruptibly().getNow()) {
-                System.err.println(address);
+                System.out.println(address);
             }
         } finally {
             resolver.close();
diff --git a/resolver-dns/src/test/java/io/netty/resolver/dns/DnsNameResolverTest.java b/resolver-dns/src/test/java/io/netty/resolver/dns/DnsNameResolverTest.java
index 00fc9c6357..6c926d7103 100644
--- a/resolver-dns/src/test/java/io/netty/resolver/dns/DnsNameResolverTest.java
+++ b/resolver-dns/src/test/java/io/netty/resolver/dns/DnsNameResolverTest.java
@@ -494,11 +494,8 @@ public class DnsNameResolverTest {
             for (Entry<String, InetAddress> e : resultA.entrySet()) {
                 InetAddress expected = e.getValue();
                 InetAddress actual = resultB.get(e.getKey());
-                if (!actual.equals(expected)) {
-                    // Print the content of the cache when test failure is expected.
-                    System.err.println("Cache for " + e.getKey() + ": " + resolver.resolveAll(e.getKey()).getNow());
-                }
-                assertThat(actual, is(expected));
+                assertThat("Cache for " + e.getKey() + ": " + resolver.resolveAll(e.getKey()).getNow(),
+                        actual, is(expected));
             }
         } finally {
             resolver.close();