Add simple unit tests for Base64

Change-Id: I22ef1eb63ae8ddb9884526099013979856ab7bd9
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

org.eclipse.jgit.test/tst/org/eclipse/jgit/util/Base64Test.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2010, Google Inc.
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.eclipse.jgit.util;
+
+import static org.eclipse.jgit.util.Base64.decode;
+import static org.eclipse.jgit.util.Base64.encodeBytes;
+import junit.framework.TestCase;
+
+import org.eclipse.jgit.lib.Constants;
+
+public class Base64Test extends TestCase {
+	public void testEncode() {
+		assertEquals("aGkK", encodeBytes(b("hi\n")));
+		assertEquals("AAECDQoJcQ==", encodeBytes(b("\0\1\2\r\n\tq")));
+	}
+
+	public void testDecode() {
+		assertEquals(b("hi\n"), decode("aGkK"));
+		assertEquals(b("\0\1\2\r\n\tq"), decode("AAECDQoJcQ=="));
+		assertEquals(b("\0\1\2\r\n\tq"), decode("A A E\tC D\rQ o\nJ c Q=="));
+		assertEquals(b("\u000EB"), decode("DkL="));
+	}
+
+	public void testDecodeFail_NonBase64Character() {
+		try {
+			decode("! a bad base64 string !");
+			fail("Accepted bad string in decode");
+		} catch (IllegalArgumentException fail) {
+			// Expected
+		}
+	}
+
+	public void testEncodeMatchesDecode() {
+		String[] testStrings = { "", //
+				"cow", //
+				"a", //
+				"a secret string", //
+				"\0\1\2\r\n\t" //
+		};
+		for (String e : testStrings)
+			assertEquals(b(e), decode(encodeBytes(b(e))));
+	}
+
+	private static void assertEquals(byte[] exp, byte[] act) {
+		assertEquals(s(exp), s(act));
+	}
+
+	private static byte[] b(String str) {
+		return Constants.encode(str);
+	}
+
+	private static String s(byte[] raw) {
+		return RawParseUtils.decode(raw);
+	}
+}