Refactoring in DefaultGraphQlTester

Align with similar changes in GraphQlClient.

spring-graphql-test/src/main/java/org/springframework/graphql/test/tester/AbstractGraphQlTesterBuilder.java

@@ -113,7 +113,7 @@ public abstract class AbstractGraphQlTesterBuilder<B extends AbstractGraphQlTest
 		}
 
 		return new DefaultGraphQlTester(transport, this.errorFilter,
-				this.jsonPathConfig, this.documentSource, this.responseTimeout, getBuilderInitializer());
+				this.jsonPathConfig, this.documentSource, this.responseTimeout);
 	}
 
 	/**

spring-graphql-test/src/main/java/org/springframework/graphql/test/tester/DefaultGraphQlTester.java

@@ -70,28 +70,23 @@ final class DefaultGraphQlTester implements GraphQlTester {
 
 	private final Duration responseTimeout;
 
-	private final Consumer<AbstractGraphQlTesterBuilder<?>> builderInitializer;
-
 
 	/**
 	 * Package private constructor for use from {@link AbstractGraphQlTesterBuilder}.
 	 */
 	DefaultGraphQlTester(
 			GraphQlTransport transport, @Nullable Predicate<ResponseError> errorFilter,
-			Configuration jsonPathConfig, DocumentSource documentSource, Duration timeout,
-			Consumer<AbstractGraphQlTesterBuilder<?>> builderInitializer) {
+			Configuration jsonPathConfig, DocumentSource documentSource, Duration timeout) {
 
 		Assert.notNull(transport, "GraphQlTransport is required");
 		Assert.notNull(jsonPathConfig, "JSONPath Configuration is required");
 		Assert.notNull(documentSource, "DocumentSource is required");
-		Assert.notNull(builderInitializer, "`builderInitializer` is required");
 
 		this.transport = transport;
 		this.errorFilter = errorFilter;
 		this.jsonPathConfig = jsonPathConfig;
 		this.documentSource = documentSource;
 		this.responseTimeout = timeout;
-		this.builderInitializer = builderInitializer;
 	}
 
 
@@ -107,30 +102,14 @@ final class DefaultGraphQlTester implements GraphQlTester {
 		return document(document);
 	}
 
-	@Override
-	public Builder mutate() {
-		Builder builder = new Builder(this.transport);
-		this.builderInitializer.accept(builder);
-		return builder;
-	}
-
-
 	/**
-	 * Default {@link GraphQlTester.Builder} with a given transport.
+	 * The default tester is unaware of transport details, and cannot implement
+	 * mutate directly. It should be wrapped from transport aware extensions via
+	 * {@link AbstractDelegatingGraphQlTester} that also implement mutate.
 	 */
-	static final class Builder extends AbstractGraphQlTesterBuilder<Builder> {
-
-		private final GraphQlTransport transport;
-
-		Builder(GraphQlTransport transport) {
-			this.transport = transport;
-		}
-
-		@Override
-		public GraphQlTester build() {
-			return super.buildGraphQlTester(this.transport);
-		}
-
+	@Override
+	public Builder<?> mutate() {
+		throw new UnsupportedOperationException();
 	}
 
 

spring-graphql-test/src/main/java/org/springframework/graphql/test/tester/GenericGraphQlTester.java

@@ -0,0 +1,77 @@
+/*
+ * 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.graphql.test.tester;
+
+
+import java.util.function.Consumer;
+
+import org.springframework.graphql.client.GraphQlTransport;
+import org.springframework.util.Assert;
+
+/**
+ * {@link GraphQlTester} with a given, externally prepared transport.
+ *
+ * @author Rossen Stoyanchev
+ * @since 1.0.0
+ */
+final class GenericGraphQlTester extends AbstractDelegatingGraphQlTester {
+
+	private final GraphQlTransport transport;
+
+	private final Consumer<AbstractGraphQlTesterBuilder<?>> builderInitializer;
+
+
+	GenericGraphQlTester(
+			GraphQlTester delegate, GraphQlTransport transport,
+			Consumer<AbstractGraphQlTesterBuilder<?>> builderInitializer) {
+
+		super(delegate);
+		Assert.notNull(transport, "GraphQlTransport is required");
+		Assert.notNull(builderInitializer, "'builderInitializer' is required");
+		this.transport = transport;
+		this.builderInitializer = builderInitializer;
+	}
+
+
+	@Override
+	public Builder mutate() {
+		Builder builder = new Builder(this.transport);
+		this.builderInitializer.accept(builder);
+		return builder;
+	}
+
+
+	/**
+	 * Default {@link GraphQlTester.Builder} with a given transport.
+	 */
+	static final class Builder extends AbstractGraphQlTesterBuilder<Builder> {
+
+		private final GraphQlTransport transport;
+
+		Builder(GraphQlTransport transport) {
+			this.transport = transport;
+		}
+
+		@Override
+		public GraphQlTester build() {
+			GraphQlTester tester = super.buildGraphQlTester(this.transport);
+			return new GenericGraphQlTester(tester, this.transport, getBuilderInitializer());
+		}
+
+	}
+
+}

spring-graphql-test/src/main/java/org/springframework/graphql/test/tester/GraphQlTester.java

@@ -88,7 +88,7 @@ public interface GraphQlTester {
 	 * @return the builder for further initialization
 	 */
 	static GraphQlTester.Builder<?> builder(GraphQlTransport transport) {
-		return new DefaultGraphQlTester.Builder(transport);
+		return new GenericGraphQlTester.Builder(transport);
 	}
 
 

spring-graphql/src/main/java/org/springframework/graphql/client/DefaultGraphQlClient.java

@@ -70,9 +70,9 @@ final class DefaultGraphQlClient implements GraphQlClient {
 	}
 
 	/**
-	 * The default client is unaware of transport details, and doesn't implement
-	 * this method. It should always be wrapped via with a transport specific
-	 * {@link AbstractDelegatingGraphQlClient} that implements mutation.
+	 * The default client is unaware of transport details, and cannot implement
+	 * mutate directly. It should be wrapped from transport aware extensions via
+	 * {@link AbstractDelegatingGraphQlClient} that also implement mutate.
 	 */
 	@Override
 	public Builder<?> mutate() {

spring-graphql/src/main/java/org/springframework/graphql/client/GenericGraphQlClient.java

@@ -49,7 +49,7 @@ final class GenericGraphQlClient extends AbstractDelegatingGraphQlClient {
 
 	@Override
 	public Builder mutate() {
-		Builder builder = new Builder(transport);
+		Builder builder = new Builder(this.transport);
 		this.builderInitializer.accept(builder);
 		return builder;
 	}