diff --git a/spring-core/src/test/java/org/springframework/core/convert/support/ByteBufferConverterTests.java b/spring-core/src/test/java/org/springframework/core/convert/support/ByteBufferConverterTests.java
index 9c0f46ecb4..c1bcf11551 100644
--- a/spring-core/src/test/java/org/springframework/core/convert/support/ByteBufferConverterTests.java
+++ b/spring-core/src/test/java/org/springframework/core/convert/support/ByteBufferConverterTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -33,57 +33,56 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 class ByteBufferConverterTests {
 
-	private GenericConversionService conversionService;
+	private final GenericConversionService conversionService = new DefaultConversionService();
 
 
 	@BeforeEach
 	void setup() {
-		this.conversionService = new DefaultConversionService();
-		this.conversionService.addConverter(new ByteArrayToOtherTypeConverter());
-		this.conversionService.addConverter(new OtherTypeToByteArrayConverter());
+		conversionService.addConverter(new ByteArrayToOtherTypeConverter());
+		conversionService.addConverter(new OtherTypeToByteArrayConverter());
 	}
 
 
 	@Test
-	void byteArrayToByteBuffer() throws Exception {
+	void byteArrayToByteBuffer() {
 		byte[] bytes = new byte[] { 1, 2, 3 };
-		ByteBuffer convert = this.conversionService.convert(bytes, ByteBuffer.class);
+		ByteBuffer convert = conversionService.convert(bytes, ByteBuffer.class);
 		assertThat(convert.array()).isNotSameAs(bytes);
 		assertThat(convert.array()).isEqualTo(bytes);
 	}
 
 	@Test
-	void byteBufferToByteArray() throws Exception {
+	void byteBufferToByteArray() {
 		byte[] bytes = new byte[] { 1, 2, 3 };
 		ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
-		byte[] convert = this.conversionService.convert(byteBuffer, byte[].class);
+		byte[] convert = conversionService.convert(byteBuffer, byte[].class);
 		assertThat(convert).isNotSameAs(bytes);
 		assertThat(convert).isEqualTo(bytes);
 	}
 
 	@Test
-	void byteBufferToOtherType() throws Exception {
+	void byteBufferToOtherType() {
 		byte[] bytes = new byte[] { 1, 2, 3 };
 		ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
-		OtherType convert = this.conversionService.convert(byteBuffer, OtherType.class);
+		OtherType convert = conversionService.convert(byteBuffer, OtherType.class);
 		assertThat(convert.bytes).isNotSameAs(bytes);
 		assertThat(convert.bytes).isEqualTo(bytes);
 	}
 
 	@Test
-	void otherTypeToByteBuffer() throws Exception {
+	void otherTypeToByteBuffer() {
 		byte[] bytes = new byte[] { 1, 2, 3 };
 		OtherType otherType = new OtherType(bytes);
-		ByteBuffer convert = this.conversionService.convert(otherType, ByteBuffer.class);
+		ByteBuffer convert = conversionService.convert(otherType, ByteBuffer.class);
 		assertThat(convert.array()).isNotSameAs(bytes);
 		assertThat(convert.array()).isEqualTo(bytes);
 	}
 
 	@Test
-	void byteBufferToByteBuffer() throws Exception {
+	void byteBufferToByteBuffer() {
 		byte[] bytes = new byte[] { 1, 2, 3 };
 		ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
-		ByteBuffer convert = this.conversionService.convert(byteBuffer, ByteBuffer.class);
+		ByteBuffer convert = conversionService.convert(byteBuffer, ByteBuffer.class);
 		assertThat(convert).isNotSameAs(byteBuffer.rewind());
 		assertThat(convert).isEqualTo(byteBuffer.rewind());
 		assertThat(convert).isEqualTo(ByteBuffer.wrap(bytes));
diff --git a/spring-core/src/test/java/org/springframework/core/convert/support/CollectionToCollectionConverterTests.java b/spring-core/src/test/java/org/springframework/core/convert/support/CollectionToCollectionConverterTests.java
index 2b94fde517..6d0f1751d9 100644
--- a/spring-core/src/test/java/org/springframework/core/convert/support/CollectionToCollectionConverterTests.java
+++ b/spring-core/src/test/java/org/springframework/core/convert/support/CollectionToCollectionConverterTests.java
@@ -49,11 +49,11 @@ import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
  */
 class CollectionToCollectionConverterTests {
 
-	private GenericConversionService conversionService = new GenericConversionService();
+	private final GenericConversionService conversionService = new GenericConversionService();
 
 
 	@BeforeEach
-	void setUp() {
+	void setup() {
 		conversionService.addConverter(new CollectionToCollectionConverter(conversionService));
 	}
 
diff --git a/spring-core/src/test/java/org/springframework/core/convert/support/MapToMapConverterTests.java b/spring-core/src/test/java/org/springframework/core/convert/support/MapToMapConverterTests.java
index e8d4e74f54..09428a6c3e 100644
--- a/spring-core/src/test/java/org/springframework/core/convert/support/MapToMapConverterTests.java
+++ b/spring-core/src/test/java/org/springframework/core/convert/support/MapToMapConverterTests.java
@@ -38,7 +38,7 @@ import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 
 /**
  * @author Keith Donald
- * @author Phil Webb
+ * @author Phillip Webb
  * @author Juergen Hoeller
  */
 class MapToMapConverterTests {
@@ -47,7 +47,7 @@ class MapToMapConverterTests {
 
 
 	@BeforeEach
-	void setUp() {
+	void setup() {
 		conversionService.addConverter(new MapToMapConverter(conversionService));
 	}
 
diff --git a/spring-core/src/test/java/org/springframework/core/convert/support/ObjectToObjectConverterTests.java b/spring-core/src/test/java/org/springframework/core/convert/support/ObjectToObjectConverterTests.java
index 7565d74992..4af44b77f4 100644
--- a/spring-core/src/test/java/org/springframework/core/convert/support/ObjectToObjectConverterTests.java
+++ b/spring-core/src/test/java/org/springframework/core/convert/support/ObjectToObjectConverterTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -18,6 +18,7 @@ package org.springframework.core.convert.support;
 
 import java.util.Optional;
 
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.core.convert.ConverterNotFoundException;
@@ -29,15 +30,19 @@ import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
  * Unit tests for {@link ObjectToObjectConverter}.
  *
  * @author Sam Brannen
- * @author Phil Webb
+ * @author Phillip Webb
  * @since 5.3.21
  * @see org.springframework.core.convert.converter.DefaultConversionServiceTests#convertObjectToObjectUsingValueOfMethod()
  */
 class ObjectToObjectConverterTests {
 
-	private final GenericConversionService conversionService = new GenericConversionService() {{
-		addConverter(new ObjectToObjectConverter());
-	}};
+	private final GenericConversionService conversionService = new GenericConversionService();
+
+
+	@BeforeEach
+	void setup() {
+		conversionService.addConverter(new ObjectToObjectConverter());
+	}
 
 
 	/**
@@ -47,7 +52,7 @@ class ObjectToObjectConverterTests {
 	@Test
 	void nonStaticToTargetTypeSimpleNameMethodWithMatchingReturnType() {
 		assertThat(conversionService.canConvert(Source.class, Data.class))
-			.as("can convert Source to Data").isTrue();
+				.as("can convert Source to Data").isTrue();
 		Data data = conversionService.convert(new Source("test"), Data.class);
 		assertThat(data).asString().isEqualTo("test");
 	}
@@ -55,21 +60,21 @@ class ObjectToObjectConverterTests {
 	@Test
 	void nonStaticToTargetTypeSimpleNameMethodWithDifferentReturnType() {
 		assertThat(conversionService.canConvert(Text.class, Data.class))
-			.as("can convert Text to Data").isFalse();
+				.as("can convert Text to Data").isFalse();
 		assertThat(conversionService.canConvert(Text.class, Optional.class))
-			.as("can convert Text to Optional").isFalse();
+				.as("can convert Text to Optional").isFalse();
 		assertThatExceptionOfType(ConverterNotFoundException.class)
-			.as("convert Text to Data")
-			.isThrownBy(() -> conversionService.convert(new Text("test"), Data.class));
+				.as("convert Text to Data")
+				.isThrownBy(() -> conversionService.convert(new Text("test"), Data.class));
 	}
 
 	@Test
 	void staticValueOfFactoryMethodWithDifferentReturnType() {
 		assertThat(conversionService.canConvert(String.class, Data.class))
-			.as("can convert String to Data").isFalse();
+				.as("can convert String to Data").isFalse();
 		assertThatExceptionOfType(ConverterNotFoundException.class)
-			.as("convert String to Data")
-			.isThrownBy(() -> conversionService.convert("test", Data.class));
+				.as("convert String to Data")
+				.isThrownBy(() -> conversionService.convert("test", Data.class));
 	}
 
 
@@ -84,9 +89,9 @@ class ObjectToObjectConverterTests {
 		public Data toData() {
 			return new Data(this.value);
 		}
-
 	}
 
+
 	static class Text {
 
 		private final String value;
@@ -98,9 +103,9 @@ class ObjectToObjectConverterTests {
 		public Optional<Data> toData() {
 			return Optional.of(new Data(this.value));
 		}
-
 	}
 
+
 	static class Data {
 
 		private final String value;
@@ -115,9 +120,8 @@ class ObjectToObjectConverterTests {
 		}
 
 		public static Optional<Data> valueOf(String string) {
-			return (string != null) ? Optional.of(new Data(string)) : Optional.empty();
+			return (string != null ? Optional.of(new Data(string)) : Optional.empty());
 		}
-
 	}
 
 }