Remove deprecated 2.2 code

See gh-19699

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/rule/OutputCaptureTests.java

@@ -1,49 +0,0 @@
-/*
- * Copyright 2012-2019 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.boot.test.rule;
-
-import org.junit.Rule;
-import org.junit.Test;
-
-import static org.assertj.core.api.Assertions.assertThat;
-
-/**
- * Tests for {@link OutputCapture}.
- *
- * @author Roland Weisleder
- */
-@Deprecated
-public class OutputCaptureTests {
-
-	@Rule
-	public OutputCapture outputCapture = new OutputCapture();
-
-	@Test
-	public void toStringShouldReturnAllCapturedOutput() {
-		System.out.println("Hello World");
-		assertThat(this.outputCapture.toString()).contains("Hello World");
-	}
-
-	@Test
-	public void reset() {
-		System.out.println("Hello");
-		this.outputCapture.reset();
-		System.out.println("World");
-		assertThat(this.outputCapture.toString()).doesNotContain("Hello").contains("World");
-	}
-
-}