AOT contribution for @PersistenceContext and @PersistenceUnit

Closes gh-28364

spring-beans/src/test/java/org/springframework/beans/factory/generator/BeanFieldGeneratorTests.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2002-2022 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.beans.factory.generator;
+
+import java.lang.reflect.Field;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.javapoet.CodeBlock;
+import org.springframework.javapoet.support.CodeSnippet;
+import org.springframework.javapoet.support.MultiStatement;
+import org.springframework.util.ReflectionUtils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link BeanFieldGenerator}.
+ *
+ * @author Stephane Nicoll
+ */
+class BeanFieldGeneratorTests {
+
+	private final BeanFieldGenerator generator = new BeanFieldGenerator();
+
+	@Test
+	void generateSetFieldWithPublicField() {
+		MultiStatement statement = this.generator.generateSetValue("bean",
+				field(SampleBean.class, "one"), CodeBlock.of("$S", "test"));
+		assertThat(CodeSnippet.process(statement.toCodeBlock())).isEqualTo("""
+				bean.one = "test";
+				""");
+	}
+
+	@Test
+	void generateSetFieldWithPrivateField() {
+		MultiStatement statement = this.generator.generateSetValue("example",
+				field(SampleBean.class, "two"), CodeBlock.of("42"));
+		CodeSnippet code = CodeSnippet.of(statement.toCodeBlock());
+		assertThat(code.getSnippet()).isEqualTo("""
+				Field twoField = ReflectionUtils.findField(BeanFieldGeneratorTests.SampleBean.class, "two");
+				ReflectionUtils.makeAccessible(twoField);
+				ReflectionUtils.setField(twoField, example, 42);
+				""");
+		assertThat(code.hasImport(ReflectionUtils.class)).isTrue();
+		assertThat(code.hasImport(BeanFieldGeneratorTests.class)).isTrue();
+	}
+
+
+	private Field field(Class<?> type, String name) {
+		Field field = ReflectionUtils.findField(type, name);
+		assertThat(field).isNotNull();
+		return field;
+	}
+
+
+	public static class SampleBean {
+
+		public String one;
+
+		private int two;
+
+	}
+
+}