1222 DefaultSchemaRegistryClient should accept a custom RestTemplate.

Added protected accessors to allow subclasses access to RestTemplate and endpoint fields.

spring-cloud-stream-schema/src/main/java/org/springframework/cloud/stream/schema/client/DefaultSchemaRegistryClient.java

@@ -36,7 +36,16 @@ public class DefaultSchemaRegistryClient implements SchemaRegistryClient {
 	private String endpoint = "http://localhost:8990";
 
 	public DefaultSchemaRegistryClient() {
-		this.template = new RestTemplate();
+		this(new RestTemplate());
+	}
+	
+	public DefaultSchemaRegistryClient(RestTemplate restTemplate) {
+		Assert.notNull(restTemplate,"restTemplate cannot be null.");
+		this.template = restTemplate;
+	}
+	
+	protected String getEndpoint() {
+		return this.endpoint;
 	}
 
 	public void setEndpoint(String endpoint) {
@@ -44,6 +53,15 @@ public class DefaultSchemaRegistryClient implements SchemaRegistryClient {
 		this.endpoint = endpoint;
 	}
 
+	protected RestTemplate getRestTemplate() {
+		return this.template;
+	}
+
+	public void setRestTemplate(RestTemplate restTemplate) {
+		Assert.notNull(restTemplate,"restTemplate cannot be null.");
+		this.template = restTemplate;
+	}
+
 	@Override
 	public SchemaRegistrationResponse register(String subject, String format, String schema) {
 		Map<String, String> requestBody = new HashMap<>();