diff --git a/src/test/java/no/digipost/DiggBaseTest.java b/src/test/java/no/digipost/DiggBaseTest.java
index d56600e..f35cfd4 100644
--- a/src/test/java/no/digipost/DiggBaseTest.java
+++ b/src/test/java/no/digipost/DiggBaseTest.java
@@ -164,6 +164,8 @@ public void useArbitraryObjectWithTryWithResources(@Mock MyResource resource) {
 
     interface MyAutoCloseableResource extends AutoCloseable {
         void done() throws IOException;
+        @Override
+        void close() throws RuntimeException;
     }
 
     @Test
diff --git a/src/test/java/no/digipost/DiggEnumsTest.java b/src/test/java/no/digipost/DiggEnumsTest.java
index 91e7492..7f395e5 100644
--- a/src/test/java/no/digipost/DiggEnumsTest.java
+++ b/src/test/java/no/digipost/DiggEnumsTest.java
@@ -54,7 +54,7 @@ public void convertFromCommaSeparatedListOfEnumNames() {
 
         qt()
             .forAll(multipleEnums)
-            .asWithPrecursor(enums -> Stream.of(enums).map(Enum::name).collect(joining(" , ", "  ", "   ")))
+            .asWithPrecursor(enums -> Stream.of(enums).map(MyEnum::name).collect(joining(" , ", "  ", "   ")))
             .checkAssert((enums, commaSeparatedNames) -> assertThat(fromCommaSeparatedNames(commaSeparatedNames, MyEnum.class), contains(enums)));
 
     }
@@ -74,11 +74,11 @@ public void convertToStringOfDelimiterSeparatedStrings() {
     public void toStringConversionsAreSpecialCasesOfTheGenericBaseCase() {
         qt()
             .forAll(multipleEnums)
-            .check(enums -> toCommaSeparatedNames(enums).equals(toStringOf(Enum::name, joining(","), enums)));
+            .check(enums -> toCommaSeparatedNames(enums).equals(toStringOf(MyEnum::name, joining(","), enums)));
 
         qt()
             .forAll(multipleEnums)
-            .check(enums -> toNames(": ", enums).equals(toStringOf(Enum::name, joining(": "), enums)));
+            .check(enums -> toNames(": ", enums).equals(toStringOf(MyEnum::name, joining(": "), enums)));
 
         qt()
             .forAll(multipleEnums)
diff --git a/src/test/java/no/digipost/collection/BatchedIterableTest.java b/src/test/java/no/digipost/collection/BatchedIterableTest.java
index 7e5b46e..8bec45a 100644
--- a/src/test/java/no/digipost/collection/BatchedIterableTest.java
+++ b/src/test/java/no/digipost/collection/BatchedIterableTest.java
@@ -36,11 +36,13 @@ class BatchedIterableTest {
 
     @Test
     void emptyBatch() {
-        Batches<Object> empty1 = new Batches<>();
+        @SuppressWarnings("unchecked")
+        Batches<?> empty1 = new Batches<>();
         assertThat(batched(empty1, b -> false), is(emptyIterable()));
         assertThat(empty1.fetches(), is(1));
 
-        Batches<Object> empty2 = new Batches<>();
+        @SuppressWarnings("unchecked")
+        Batches<?> empty2 = new Batches<>();
         assertThat(batched(empty2, b -> true), is(emptyIterable()));
         assertThat(empty2.fetches(), is(2));
     }
diff --git a/src/test/java/no/digipost/io/InputStreamIteratorTest.java b/src/test/java/no/digipost/io/InputStreamIteratorTest.java
index 060520c..0524a29 100644
--- a/src/test/java/no/digipost/io/InputStreamIteratorTest.java
+++ b/src/test/java/no/digipost/io/InputStreamIteratorTest.java
@@ -71,7 +71,7 @@ void throws_if_next_is_called_with_no_more_elements() throws Exception {
             InputStreamIterator iterator = new InputStreamIterator(inputStream, 2);
 
             assertThat(consumeToString(iterator, UTF_8), is("Some data"));
-            assertThat(iterator, whereNot(Iterator::hasNext));
+            assertThat(iterator, whereNot(Iterator<byte[]>::hasNext));
 
             assertThrows(NoSuchElementException.class, iterator::next);
         }