diff --git a/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/IncrementalBuildMetadataGenerationTests.java b/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/IncrementalBuildMetadataGenerationTests.java
index f5e80e4eae6..35b7e94245d 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/IncrementalBuildMetadataGenerationTests.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/IncrementalBuildMetadataGenerationTests.java
@@ -16,7 +16,6 @@
 
 package org.springframework.boot.configurationprocessor;
 
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.configurationprocessor.metadata.ConfigurationMetadata;
@@ -74,7 +73,6 @@ class IncrementalBuildMetadataGenerationTests extends AbstractMetadataGeneration
 	}
 
 	@Test
-	@Disabled("gh-26271")
 	void incrementalBuildTypeRenamed() throws Exception {
 		TestProject project = new TestProject(this.tempDir, FooProperties.class, BarProperties.class);
 		ConfigurationMetadata metadata = project.fullBuild();
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/TestProject.java b/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/TestProject.java
index c8442e974ce..1a7d90277d3 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/TestProject.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/TestProject.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -23,15 +23,18 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.StringReader;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashSet;
 import java.util.LinkedHashSet;
+import java.util.List;
 import java.util.Set;
 
 import org.springframework.boot.configurationprocessor.metadata.ConfigurationMetadata;
 import org.springframework.boot.configurationprocessor.test.TestConfigurationMetadataAnnotationProcessor;
 import org.springframework.boot.configurationsample.ConfigurationProperties;
 import org.springframework.boot.configurationsample.NestedConfigurationProperty;
+import org.springframework.boot.testsupport.BuildOutput;
 import org.springframework.boot.testsupport.compiler.TestCompiler;
 import org.springframework.boot.testsupport.compiler.TestCompiler.TestCompilationTask;
 import org.springframework.util.Assert;
@@ -56,21 +59,41 @@ public class TestProject {
 	 * Contains copies of the original source so we can modify it safely to test
 	 * incremental builds.
 	 */
-	private File sourceDirectory;
+	private final File sourceDirectory;
 
-	private TestCompiler compiler;
+	private final TestCompiler compiler;
 
-	private Set<File> sourceFiles = new LinkedHashSet<>();
+	private final Set<File> sourceFiles = new LinkedHashSet<>();
+
+	private final File classPathDirectory;
 
 	public TestProject(File tempDirectory, Class<?>... classes) throws IOException {
 		this.sourceDirectory = new File(tempDirectory, "src");
-		this.compiler = new TestCompiler(new File(tempDirectory, "build")) {
+		File outputDirectory = new File(tempDirectory, "build");
+		File testClasses = new BuildOutput(TestProject.class).getTestClassesLocation();
+		this.classPathDirectory = new File(tempDirectory, "classPath");
+		FileSystemUtils.copyRecursively(testClasses, this.classPathDirectory);
+		this.compiler = new TestCompiler(outputDirectory) {
 
 			@Override
 			protected File getSourceDirectory() {
 				return TestProject.this.sourceDirectory;
 			}
 
+			@Override
+			protected Iterable<? extends File> prepareClassPath(Iterable<? extends File> classPath) {
+				List<File> updatedClassPath = new ArrayList<>();
+				for (File entry : classPath) {
+					if (!entry.equals(testClasses)) {
+						updatedClassPath.add(entry);
+					}
+					else {
+						updatedClassPath.add(TestProject.this.classPathDirectory);
+					}
+				}
+				return updatedClassPath;
+			}
+
 		};
 		Set<Class<?>> contents = new HashSet<>(Arrays.asList(classes));
 		contents.addAll(Arrays.asList(ALWAYS_INCLUDE));
@@ -143,13 +166,17 @@ public class TestProject {
 	}
 
 	/**
-	 * Delete source file for given class from project.
+	 * Delete from the project the source {@code .java} file and any compiled
+	 * {@code .class} file for the given class.
 	 * @param type the class to delete
 	 */
 	public void delete(Class<?> type) {
 		File target = getSourceFile(type);
 		target.delete();
 		this.sourceFiles.remove(target);
+		String fileName = type.getName().replace(".", "/") + ".class";
+		new File(this.compiler.getOutputLocation(), fileName).delete();
+		new File(this.classPathDirectory, fileName).delete();
 	}
 
 	/**
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/compiler/TestCompiler.java b/spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/compiler/TestCompiler.java
index 8eb8511a98e..ed90f6e292a 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/compiler/TestCompiler.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/compiler/TestCompiler.java
@@ -62,6 +62,8 @@ public class TestCompiler {
 		Iterable<? extends File> temp = Collections.singletonList(this.outputLocation);
 		this.fileManager.setLocation(StandardLocation.CLASS_OUTPUT, temp);
 		this.fileManager.setLocation(StandardLocation.SOURCE_OUTPUT, temp);
+		Iterable<? extends File> classPath = this.fileManager.getLocation(StandardLocation.CLASS_PATH);
+		this.fileManager.setLocation(StandardLocation.CLASS_PATH, prepareClassPath(classPath));
 	}
 
 	public TestCompilationTask getTask(Collection<File> sourceFiles) {
@@ -103,6 +105,10 @@ public class TestCompiler {
 		return SOURCE_DIRECTORY;
 	}
 
+	protected Iterable<? extends File> prepareClassPath(Iterable<? extends File> classPath) {
+		return classPath;
+	}
+
 	/**
 	 * A compilation task.
 	 */