Add some missing tests.

Author: Gary Gregory

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

@@ -18,12 +18,16 @@
 package org.apache.commons.io.function;
 
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
-
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import java.io.Closeable;
 import java.io.IOException;
 import java.io.StringReader;
+import java.nio.file.Files;
+import java.util.concurrent.atomic.AtomicReference;
 
 import org.apache.commons.io.IOUtils;
+import org.apache.commons.io.Uncheck;
+import org.apache.commons.io.file.PathUtils;
 import org.apache.commons.io.test.ThrowOnCloseReader;
 import org.junit.jupiter.api.Test;
 
@@ -33,12 +37,34 @@
 public class IOConsumerTest {
 
     @Test
-    public void testNoopIOConsumer() {
+    void testAccept() throws IOException {
+        IOConsumer.noop().accept(null);
+        IOConsumer.noop().accept(".");
+        Uncheck.accept(Files::size, PathUtils.current());
+        //
+        final AtomicReference<String> ref = new AtomicReference<>();
+        final IOConsumer<String> consumer = s -> ref.set(s + "1");
+        consumer.accept("A");
+        assertEquals("A1", ref.get());
+    }
+
+    @Test
+    void testAndThen() throws IOException {
+        final AtomicReference<String> ref = new AtomicReference<>();
+        final IOConsumer<String> consumer1 = s -> ref.set(s + "1");
+        final IOConsumer<String> consumer2 = s -> ref.set(ref.get() + "2" + s);
+        consumer1.andThen(consumer2).accept("B");
+        assertEquals("B12B", ref.get());
+    }
+
+    @Test
+    public void testNoop() {
         final Closeable nullCloseable = null;
         final IOConsumer<IOException> noopConsumer = IOConsumer.noop(); // noop consumer doesn't throw
         assertDoesNotThrow(() -> IOUtils.close(nullCloseable, noopConsumer));
         assertDoesNotThrow(() -> IOUtils.close(new StringReader("s"), noopConsumer));
         assertDoesNotThrow(() -> IOUtils.close(new ThrowOnCloseReader(new StringReader("s")), noopConsumer));
     }
 
+
 }