Add post processor to register ProviderSettings Bean

Closes gh-373

oauth2-authorization-server/src/test/java/org/springframework/security/config/annotation/web/configuration/RegisterMissingBeanPostProcessorTests.java

@@ -0,0 +1,110 @@
+/*
+ * Copyright 2020-2021 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.
+ * 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.security.config.annotation.web.configuration;
+
+import java.util.function.Supplier;
+
+import org.junit.Test;
+import org.mockito.ArgumentCaptor;
+
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.support.BeanDefinitionRegistry;
+import org.springframework.beans.factory.support.DefaultListableBeanFactory;
+import org.springframework.beans.factory.support.RootBeanDefinition;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.endsWith;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoInteractions;
+
+/**
+ * Tests for {@link RegisterMissingBeanPostProcessor}.
+ *
+ * @author Steve Riesenberg
+ */
+public class RegisterMissingBeanPostProcessorTests {
+	private final RegisterMissingBeanPostProcessor postProcessor = new RegisterMissingBeanPostProcessor();
+
+	@Test
+	public void postProcessBeanDefinitionRegistryWhenClassAddedThenRegisteredWithClass() {
+		this.postProcessor.addBeanDefinition(SimpleBean.class, null);
+		this.postProcessor.setBeanFactory(new DefaultListableBeanFactory());
+
+		BeanDefinitionRegistry beanDefinitionRegistry = mock(BeanDefinitionRegistry.class);
+		this.postProcessor.postProcessBeanDefinitionRegistry(beanDefinitionRegistry);
+
+		ArgumentCaptor<BeanDefinition> beanDefinitionCaptor = ArgumentCaptor.forClass(BeanDefinition.class);
+		verify(beanDefinitionRegistry).registerBeanDefinition(endsWith("SimpleBean"), beanDefinitionCaptor.capture());
+
+		RootBeanDefinition beanDefinition = (RootBeanDefinition) beanDefinitionCaptor.getValue();
+		assertThat(beanDefinition.getBeanClass()).isEqualTo(SimpleBean.class);
+		assertThat(beanDefinition.getInstanceSupplier()).isNull();
+	}
+
+	@Test
+	public void postProcessBeanDefinitionRegistryWhenSupplierAddedThenRegisteredWithSupplier() {
+		Supplier<SimpleBean> beanSupplier = () -> new SimpleBean("string");
+		this.postProcessor.addBeanDefinition(SimpleBean.class, beanSupplier);
+		this.postProcessor.setBeanFactory(new DefaultListableBeanFactory());
+
+		BeanDefinitionRegistry beanDefinitionRegistry = mock(BeanDefinitionRegistry.class);
+		this.postProcessor.postProcessBeanDefinitionRegistry(beanDefinitionRegistry);
+
+		ArgumentCaptor<BeanDefinition> beanDefinitionCaptor = ArgumentCaptor.forClass(BeanDefinition.class);
+		verify(beanDefinitionRegistry).registerBeanDefinition(endsWith("SimpleBean"), beanDefinitionCaptor.capture());
+
+		RootBeanDefinition beanDefinition = (RootBeanDefinition) beanDefinitionCaptor.getValue();
+		assertThat(beanDefinition.getBeanClass()).isEqualTo(SimpleBean.class);
+		assertThat(beanDefinition.getInstanceSupplier()).isEqualTo(beanSupplier);
+	}
+
+	@Test
+	public void postProcessBeanDefinitionRegistryWhenNoBeanDefinitionsAddedThenNoneRegistered() {
+		this.postProcessor.setBeanFactory(new DefaultListableBeanFactory());
+
+		BeanDefinitionRegistry beanDefinitionRegistry = mock(BeanDefinitionRegistry.class);
+		this.postProcessor.postProcessBeanDefinitionRegistry(beanDefinitionRegistry);
+		verifyNoInteractions(beanDefinitionRegistry);
+	}
+
+	@Test
+	public void postProcessBeanDefinitionRegistryWhenBeanDefinitionAlreadyExistsThenNoneRegistered() {
+		this.postProcessor.addBeanDefinition(SimpleBean.class, null);
+		DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
+		beanFactory.registerBeanDefinition("simpleBean", new RootBeanDefinition(SimpleBean.class));
+		this.postProcessor.setBeanFactory(beanFactory);
+
+		BeanDefinitionRegistry beanDefinitionRegistry = mock(BeanDefinitionRegistry.class);
+		this.postProcessor.postProcessBeanDefinitionRegistry(beanDefinitionRegistry);
+		verifyNoInteractions(beanDefinitionRegistry);
+	}
+
+	private static final class SimpleBean {
+		private final String field;
+
+		private SimpleBean(String field) {
+			this.field = field;
+		}
+
+		private String getField() {
+			return field;
+		}
+
+	}
+
+}