Add assertThrows

This is a new assertion that will be introduced in JUnit 4.13. Unlike
ExpectedException rule, this makes it easy to test other aspects of the
thrown exception, such like ServiceMayNotContinueException's status
code. Introduce this as before making changes to UploadPackTest more.

Change-Id: Ied7b3071ffcd0e93eece35b01e0abc5ff65645f2
Signed-off-by: Masaya Suzuki <masayasuzuki@google.com>

1 files changed, 79 insertions, 0 deletions

diff --git a/org.eclipse.jgit.test/src/org/eclipse/jgit/lib/MoreAsserts.java b/org.eclipse.jgit.test/src/org/eclipse/jgit/lib/MoreAsserts.java
new file mode 100644
index 0000000000..5945e7e43d
--- /dev/null
+++ b/org.eclipse.jgit.test/src/org/eclipse/jgit/lib/MoreAsserts.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2019, Google LLC
+ * 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.lib;
+
+/** Assertion methods. */
+public class MoreAsserts {
+	/**
+	 * Simple version of assertThrows that will be introduced in JUnit 4.13.
+	 *
+	 * @param expected
+	 *            Expected throwable class
+	 * @param r
+	 *            Runnable that is expected to throw an exception.
+	 * @return The thrown exception.
+	 */
+	public static <T extends Throwable> T assertThrows(Class<T> expected,
+			ThrowingRunnable r) {
+		try {
+			r.run();
+		} catch (Throwable actual) {
+			if (expected.isAssignableFrom(actual.getClass())) {
+				@SuppressWarnings("unchecked")
+				T toReturn = (T) actual;
+				return toReturn;
+			}
+			throw new AssertionError("Expected " + expected.getSimpleName()
+					+ ", but got " + actual.getClass().getSimpleName(), actual);
+		}
+		throw new AssertionError(
+				"Expected " + expected.getSimpleName() + " to be thrown");
+	}
+
+	public interface ThrowingRunnable {
+		void run() throws Throwable;
+	}
+
+	private MoreAsserts() {
+	}
+}