Support multiple WireMockConfigurationCustomizers (#1501)

- fixes #1500

spring-cloud-contract-wiremock/src/main/java/org/springframework/cloud/contract/wiremock/WireMockConfiguration.java

@@ -33,6 +33,7 @@ import com.github.tomakehurst.wiremock.stubbing.StubMapping;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
+import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.boot.context.properties.ConfigurationProperties;
@@ -78,7 +79,7 @@ public class WireMockConfiguration implements SmartLifecycle {
 	private Options options;
 
 	@Autowired(required = false)
-	private WireMockConfigurationCustomizer customizer;
+	private ObjectProvider<WireMockConfigurationCustomizer> customizers;
 
 	@Autowired
 	private DefaultListableBeanFactory beanFactory;
@@ -106,8 +107,9 @@ public class WireMockConfiguration implements SmartLifecycle {
 				factory.extensions(new ResponseTemplateTransformer(false));
 			}
 			this.options = factory;
-			if (this.customizer != null) {
-				this.customizer.customize(factory);
+			if (this.customizers != null) {
+				this.customizers.orderedStream()
+						.forEach(customizer -> customizer.customize(factory));
 			}
 		}
 		reRegisterServerWithResetMappings();

spring-cloud-contract-wiremock/src/test/java/org/springframework/cloud/contract/wiremock/AutoConfigureWireMockConfigurationMultipleCustomizerTests.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2013-2020 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.cloud.contract.wiremock;
+
+import com.github.tomakehurst.wiremock.core.WireMockConfiguration;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(
+		classes = { WiremockTestsApplication.class,
+				AutoConfigureWireMockConfigurationMultipleCustomizerTests.Config.class },
+		webEnvironment = WebEnvironment.NONE)
+@AutoConfigureWireMock(port = 0)
+public class AutoConfigureWireMockConfigurationMultipleCustomizerTests {
+
+	@Autowired
+	private Config config;
+
+	@Test
+	public void bothCustomizersHaveBeenExecuted() throws Exception {
+		assertThat(this.config.isExecuted()).isTrue();
+	}
+
+	@Configuration
+	protected static class Config {
+
+		boolean executedCustomizer1 = false;
+
+		boolean executedCustomizer2 = false;
+
+		@Bean
+		WireMockConfigurationCustomizer optionsCustomizer1() {
+			return new WireMockConfigurationCustomizer() {
+				@Override
+				public void customize(WireMockConfiguration options) {
+					Config.this.executedCustomizer1 = true;
+				}
+			};
+		}
+
+		@Bean
+		WireMockConfigurationCustomizer optionsCustomizer2() {
+			return new WireMockConfigurationCustomizer() {
+				@Override
+				public void customize(WireMockConfiguration options) {
+					Config.this.executedCustomizer2 = true;
+				}
+			};
+		}
+
+		public boolean isExecuted() {
+			return this.executedCustomizer1 && this.executedCustomizer2;
+		}
+
+	}
+
+}