Remove testsupport.assertj package

See gh-17557

spring-boot-project/spring-boot-tools/spring-boot-test-support/src/test/java/org/springframework/boot/testsupport/assertj/MatchedTests.java

@@ -1,56 +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.testsupport.assertj;
-
-import org.junit.jupiter.api.Test;
-
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
-import static org.hamcrest.Matchers.startsWith;
-
-/**
- * Tests for {@link Matched}.
- *
- * @author Phillip Webb
- */
-class MatchedTests {
-
-	@Test
-	void byMatcherMatches() {
-		assertThat("1234").is(Matched.by(startsWith("12")));
-	}
-
-	@Test
-	void byMatcherDoesNotMatch() {
-		assertThatExceptionOfType(AssertionError.class)
-				.isThrownBy(() -> assertThat("1234").is(Matched.by(startsWith("23"))))
-				.withMessageContaining("a string starting with \"23\"");
-	}
-
-	@Test
-	void whenMatcherMatches() {
-		assertThat("1234").is(Matched.when(startsWith("12")));
-	}
-
-	@Test
-	void whenMatcherDoesNotMatch() {
-		assertThatExceptionOfType(AssertionError.class)
-				.isThrownBy(() -> assertThat("1234").is(Matched.when(startsWith("23"))))
-				.withMessageContaining("a string starting with \"23\"");
-	}
-
-}