Remove unnecessary throws declaration in tests

See gh-26441

spring-boot-project/spring-boot-tools/spring-boot-configuration-metadata/src/test/java/org/springframework/boot/configurationmetadata/ConfigurationMetadataRepositoryJsonBuilderTests.java

@@ -34,7 +34,7 @@ import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException
 class ConfigurationMetadataRepositoryJsonBuilderTests extends AbstractConfigurationMetadataTests {
 
 	@Test
-	void nullResource() throws IOException {
+	void nullResource() {
 		assertThatIllegalArgumentException()
 				.isThrownBy(() -> ConfigurationMetadataRepositoryJsonBuilder.create().withJsonResource(null));
 	}

spring-boot-project/spring-boot-tools/spring-boot-configuration-metadata/src/test/java/org/springframework/boot/configurationmetadata/JsonReaderTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -46,7 +46,7 @@ class JsonReaderTests extends AbstractConfigurationMetadataTests {
 	}
 
 	@Test
-	void invalidMetadata() throws IOException {
+	void invalidMetadata() {
 		assertThatIllegalStateException().isThrownBy(() -> readFor("invalid")).withCauseInstanceOf(JSONException.class);
 	}