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ggregory pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/commons-io.git
commit db248f01550c9646ff1a81e7f08f7f8af51cfc55
Author: Gary Gregory <garydgreg...@gmail.com>
AuthorDate: Sun Jul 14 19:13:58 2024 -0400
Add PeekableInputStreamTest
---
.../io/input/buffer/PeekableInputStreamTest.java | 103 +++++++++++++++++++++
1 file changed, 103 insertions(+)
diff --git
a/src/test/java/org/apache/commons/io/input/buffer/PeekableInputStreamTest.java
b/src/test/java/org/apache/commons/io/input/buffer/PeekableInputStreamTest.java
new file mode 100644
index 000000000..b79ba8bf8
--- /dev/null
+++
b/src/test/java/org/apache/commons/io/input/buffer/PeekableInputStreamTest.java
@@ -0,0 +1,103 @@
+/*
+ * 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.buffer;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.util.Random;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Tests {@link PeekableInputStream}.
+ */
+public class PeekableInputStreamTest {
+
+ /**
+ * System.currentTimeMillis(), when this test was written. Always using
the same seed should ensure a reproducible test.
+ */
+ private final Random random = new Random(1530960934483L);
+
+ void asssertNotEof(final int offset, final int res) {
+ assertNotEquals(-1, res, () -> "Unexpected EOF at offset " + offset);
+ }
+
+ /**
+ * Create a large, but random input buffer.
+ */
+ private byte[] newInputBuffer() {
+ final byte[] buffer = new byte[16 * 512 + random.nextInt(512)];
+ random.nextBytes(buffer);
+ return buffer;
+ }
+
+ @Test
+ public void testIO683() throws IOException {
+ final byte[] buffer = {0, 1, -2, -2, -1, 4};
+ try (ByteArrayInputStream bais = new ByteArrayInputStream(buffer);
final PeekableInputStream cbis = new PeekableInputStream(bais)) {
+ int b;
+ int i = 0;
+ while ((b = cbis.read()) != -1) {
+ assertEquals(buffer[i] & 0xFF, b, "byte at index " + i + "
should be equal");
+ i++;
+ }
+ assertEquals(buffer.length, i, "Should have read all the bytes");
+ }
+ }
+
+ @Test
+ public void testRandomRead() throws Exception {
+ final byte[] inputBuffer = newInputBuffer();
+ final byte[] bufferCopy = new byte[inputBuffer.length];
+ final ByteArrayInputStream bais = new
ByteArrayInputStream(inputBuffer);
+ @SuppressWarnings("resource")
+ final PeekableInputStream cbis = new PeekableInputStream(bais, 253);
+ int offset = 0;
+ final byte[] readBuffer = new byte[256];
+ while (offset < bufferCopy.length) {
+ switch (random.nextInt(2)) {
+ case 0: {
+ final int res = cbis.read();
+ asssertNotEof(offset, res);
+ // MUST compare bytes
+ assertEquals(inputBuffer[offset], (byte) res, "Expected " +
inputBuffer[offset] + " at offset " + offset + ", got " + res);
+ ++offset;
+ break;
+ }
+ case 1: {
+ final int res = cbis.read(readBuffer, 0,
random.nextInt(readBuffer.length + 1));
+ asssertNotEof(offset, res);
+ assertNotEquals(0, res, "Unexpected zero-byte-result at offset
" + offset);
+ for (int i = 0; i < res; i++) {
+ assertEquals(inputBuffer[offset], readBuffer[i], "Expected
" + inputBuffer[offset] + " at offset " + offset + ", got " + readBuffer[i]);
+ ++offset;
+ }
+ break;
+ }
+ default:
+ fail("Unexpected random choice value");
+ }
+ }
+ assertTrue(true, "Test finished OK");
+ }
+}
