Use method references

Author: garydgregory

src/test/java/org/apache/commons/io/function/TestConstants.java

@@ -44,17 +44,17 @@ class TestConstants {
 
     static IOFunction<Object, Object> THROWING_IO_FUNCTION = t -> throwIOException();
 
-    static IOIntSupplier THROWING_IO_INT_SUPPLIER = () -> throwIOException();
+    static IOIntSupplier THROWING_IO_INT_SUPPLIER = TestConstants::throwIOException;
 
-    static IOLongSupplier THROWING_IO_LONG_SUPPLIER = () -> throwIOException();
+    static IOLongSupplier THROWING_IO_LONG_SUPPLIER = TestConstants::throwIOException;
 
     static IOPredicate<Object> THROWING_IO_PREDICATE = t -> throwIOException();
 
     static IOQuadFunction<Object, Object, Object, Object, Object> THROWING_IO_QUAD_FUNCTION = (t, u, v, w) -> throwIOException();
 
-    static IORunnable THROWING_IO_RUNNABLE = () -> throwIOException();
+    static IORunnable THROWING_IO_RUNNABLE = TestConstants::throwIOException;
 
-    static IOSupplier<Object> THROWING_IO_SUPPLIER = () -> throwIOException();
+    static IOSupplier<Object> THROWING_IO_SUPPLIER = TestConstants::throwIOException;
 
     static IOTriConsumer<Object, Object, Object> THROWING_IO_TRI_CONSUMER = (t, u, v) -> throwIOException();