Delete unused Matchers class

Delete the `Matches` class since it's no longer being used.

spring-core/src/test/java/org/springframework/tests/Matchers.java

@@ -1,66 +0,0 @@
-/*
- * Copyright 2002-2019 the original author or authors.
- *
- * Licensed 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
- *
- *      https://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.springframework.tests;
-
-import org.hamcrest.BaseMatcher;
-import org.hamcrest.Description;
-import org.hamcrest.Matcher;
-import org.junit.Rule;
-
-/**
- * Additional hamcrest matchers.
- *
- * @author Phillip Webb
- */
-public class Matchers {
-
-	/**
-	 * Create a matcher that wrapps the specified matcher and tests against the
-	 * {@link Throwable#getCause() cause} of an exception. If the item tested
-	 * is {@code null} not a {@link Throwable} the wrapped matcher will be called
-	 * with a {@code null} item.
-	 *
-	 * <p>Often useful when working with JUnit {@link ExpectedException}
-	 * {@link Rule @Rule}s, for example:
-	 * <pre>
-	 * thrown.expect(DataAccessException.class);
-	 * thrown.except(exceptionCause(isA(SQLException.class)));
-	 * </pre>
-	 *
-	 * @param matcher the matcher to wrap (must not be null)
-	 * @return a matcher that tests using the exception cause
-	 */
-	@SuppressWarnings("unchecked")
-	public static <T> Matcher<T> exceptionCause(final Matcher<T> matcher) {
-		return (Matcher<T>) new BaseMatcher<Object>() {
-			@Override
-			public boolean matches(Object item) {
-				Throwable cause = null;
-				if (item != null && item instanceof Throwable) {
-					cause = ((Throwable)item).getCause();
-				}
-				return matcher.matches(cause);
-			}
-
-			@Override
-			public void describeTo(Description description) {
-				description.appendText("exception cause ").appendDescriptionOf(matcher);
-			}
-		};
-	}
-
-}