Add missing test

Author: garydgregory

src/test/java/org/apache/commons/io/input/ProxyInputStreamTest.java

@@ -0,0 +1,144 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.io.input;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Arrays;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Tests {@link ProxyInputStream}.
+ */
+public class ProxyInputStreamTest {
+
+    private static final class ProxyInputStreamFixture extends ProxyInputStream {
+
+        public ProxyInputStreamFixture(final InputStream proxy) {
+            super(proxy);
+        }
+
+    }
+
+    @Test
+    public void testRead() throws IOException {
+        try (CharSequenceInputStream proxy = CharSequenceInputStream.builder().setCharSequence("abc").get();
+                ProxyInputStream inputStream = new ProxyInputStreamFixture(proxy)) {
+            int found = inputStream.read();
+            assertEquals('a', found);
+            found = inputStream.read();
+            assertEquals('b', found);
+            found = inputStream.read();
+            assertEquals('c', found);
+            found = inputStream.read();
+            assertEquals(-1, found);
+        }
+    }
+
+    @Test
+    public void testReadArrayAtMiddleFully() throws IOException {
+        try (CharSequenceInputStream proxy = CharSequenceInputStream.builder().setCharSequence("abc").get();
+                ProxyInputStream inputStream = new ProxyInputStreamFixture(proxy)) {
+            final byte[] dest = new byte[5];
+            int found = inputStream.read(dest, 2, 3);
+            assertEquals(3, found);
+            assertArrayEquals(new byte[] { 0, 0, 'a', 'b', 'c' }, dest);
+            found = inputStream.read(dest, 2, 3);
+            assertEquals(-1, found);
+        }
+    }
+
+    @Test
+    public void testReadArrayAtStartFully() throws IOException {
+        try (CharSequenceInputStream proxy = CharSequenceInputStream.builder().setCharSequence("abc").get();
+                ProxyInputStream inputStream = new ProxyInputStreamFixture(proxy)) {
+            final byte[] dest = new byte[5];
+            int found = inputStream.read(dest, 0, 5);
+            assertEquals(3, found);
+            assertArrayEquals(new byte[] { 'a', 'b', 'c', 0, 0 }, dest);
+            found = inputStream.read(dest, 0, 5);
+            assertEquals(-1, found);
+        }
+    }
+
+    @Test
+    public void testReadArrayAtStartPartial() throws IOException {
+        try (CharSequenceInputStream proxy = CharSequenceInputStream.builder().setCharSequence("abc").get();
+                ProxyInputStream inputStream = new ProxyInputStreamFixture(proxy)) {
+            final byte[] dest = new byte[5];
+            int found = inputStream.read(dest, 0, 2);
+            assertEquals(2, found);
+            assertArrayEquals(new byte[] { 'a', 'b', 0, 0, 0 }, dest);
+            Arrays.fill(dest, (byte) 0);
+            found = inputStream.read(dest, 0, 2);
+            assertEquals(1, found);
+            assertArrayEquals(new byte[] { 'c', 0, 0, 0, 0 }, dest);
+            found = inputStream.read(dest, 0, 2);
+            assertEquals(-1, found);
+        }
+    }
+
+    @Test
+    public void testReadArrayFully() throws IOException {
+        try (CharSequenceInputStream proxy = CharSequenceInputStream.builder().setCharSequence("abc").get();
+                ProxyInputStream inputStream = new ProxyInputStreamFixture(proxy)) {
+            final byte[] dest = new byte[5];
+            int found = inputStream.read(dest);
+            assertEquals(3, found);
+            assertArrayEquals(new byte[] { 'a', 'b', 'c', 0, 0 }, dest);
+            found = inputStream.read(dest);
+            assertEquals(-1, found);
+        }
+    }
+
+    @Test
+    public void testReadArrayPartial() throws IOException {
+        try (CharSequenceInputStream proxy = CharSequenceInputStream.builder().setCharSequence("abc").get();
+                ProxyInputStream inputStream = new ProxyInputStreamFixture(proxy)) {
+            final byte[] dest = new byte[2];
+            int found = inputStream.read(dest);
+            assertEquals(2, found);
+            assertArrayEquals(new byte[] { 'a', 'b' }, dest);
+            Arrays.fill(dest, (byte) 0);
+            found = inputStream.read(dest);
+            assertEquals(1, found);
+            assertArrayEquals(new byte[] { 'c', 0 }, dest);
+            found = inputStream.read(dest);
+            assertEquals(-1, found);
+        }
+    }
+
+    @Test
+    public void testReadEof() throws Exception {
+        final ByteArrayInputStream proxy = new ByteArrayInputStream(new byte[2]);
+        try (ProxyInputStream inputStream = new ProxyInputStreamFixture(proxy)) {
+            int found = inputStream.read();
+            assertEquals(0, found);
+            found = inputStream.read();
+            assertEquals(0, found);
+            found = inputStream.read();
+            assertEquals(-1, found);
+        }
+    }
+
+}