test: enhance resource reading tests (#314)

- Implement comprehensive resource content validation for text/plain and application/octet-stream MIME types
- Validate resource count expectations (10 resources)
- Add elicitation capability testing with ElicitRequest/ElicitResult support
- Clean up unused imports (ObjectMapper, ImageFromDockerfile)

Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>

Author: tzolov

mcp-spring/mcp-spring-webflux/src/test/java/io/modelcontextprotocol/client/WebClientStreamableHttpAsyncClientTests.java

@@ -1,13 +1,12 @@
 package io.modelcontextprotocol.client;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
 import io.modelcontextprotocol.client.transport.WebClientStreamableHttpTransport;
 import io.modelcontextprotocol.spec.McpClientTransport;
 import org.junit.jupiter.api.Timeout;
-import org.springframework.web.reactive.function.client.WebClient;
 import org.testcontainers.containers.GenericContainer;
 import org.testcontainers.containers.wait.strategy.Wait;
-import org.testcontainers.images.builder.ImageFromDockerfile;
+
+import org.springframework.web.reactive.function.client.WebClient;
 
 @Timeout(15)
 public class WebClientStreamableHttpAsyncClientTests extends AbstractMcpAsyncClientTests {

mcp-spring/mcp-spring-webflux/src/test/java/io/modelcontextprotocol/client/WebFluxSseMcpAsyncClientTests.java

@@ -6,13 +6,13 @@
 
 import java.time.Duration;
 
-import io.modelcontextprotocol.client.transport.WebFluxSseClientTransport;
-import io.modelcontextprotocol.spec.McpClientTransport;
 import org.junit.jupiter.api.Timeout;
+import org.springframework.web.reactive.function.client.WebClient;
 import org.testcontainers.containers.GenericContainer;
 import org.testcontainers.containers.wait.strategy.Wait;
 
-import org.springframework.web.reactive.function.client.WebClient;
+import io.modelcontextprotocol.client.transport.WebFluxSseClientTransport;
+import io.modelcontextprotocol.spec.McpClientTransport;
 
 /**
  * Tests for the {@link McpAsyncClient} with {@link WebFluxSseClientTransport}.

mcp-test/src/main/java/io/modelcontextprotocol/client/AbstractMcpAsyncClientTests.java

@@ -4,7 +4,14 @@
 
 package io.modelcontextprotocol.client;
 
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatCode;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.assertj.core.api.Assertions.fail;
+import static org.junit.jupiter.api.Assertions.assertInstanceOf;
+
 import java.time.Duration;
+import java.util.ArrayList;
 import java.util.Map;
 import java.util.Objects;
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -13,9 +20,16 @@
 import java.util.function.Consumer;
 import java.util.function.Function;
 
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
 import io.modelcontextprotocol.spec.McpClientTransport;
 import io.modelcontextprotocol.spec.McpError;
 import io.modelcontextprotocol.spec.McpSchema;
+import io.modelcontextprotocol.spec.McpSchema.BlobResourceContents;
 import io.modelcontextprotocol.spec.McpSchema.CallToolRequest;
 import io.modelcontextprotocol.spec.McpSchema.ClientCapabilities;
 import io.modelcontextprotocol.spec.McpSchema.CreateMessageRequest;
@@ -24,28 +38,19 @@
 import io.modelcontextprotocol.spec.McpSchema.ElicitResult;
 import io.modelcontextprotocol.spec.McpSchema.GetPromptRequest;
 import io.modelcontextprotocol.spec.McpSchema.Prompt;
+import io.modelcontextprotocol.spec.McpSchema.ReadResourceResult;
 import io.modelcontextprotocol.spec.McpSchema.Resource;
+import io.modelcontextprotocol.spec.McpSchema.ResourceContents;
 import io.modelcontextprotocol.spec.McpSchema.Root;
 import io.modelcontextprotocol.spec.McpSchema.SubscribeRequest;
+import io.modelcontextprotocol.spec.McpSchema.TextResourceContents;
 import io.modelcontextprotocol.spec.McpSchema.Tool;
 import io.modelcontextprotocol.spec.McpSchema.UnsubscribeRequest;
 import io.modelcontextprotocol.spec.McpTransport;
-import org.junit.jupiter.api.AfterEach;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Disabled;
-import org.junit.jupiter.api.Test;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.ValueSource;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 import reactor.test.StepVerifier;
 
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.assertThatCode;
-import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.assertj.core.api.Assertions.fail;
-import static org.junit.jupiter.api.Assertions.assertInstanceOf;
-
 /**
  * Test suite for the {@link McpAsyncClient} that can be used with different
  * {@link McpTransport} implementations.
@@ -406,18 +411,59 @@ void testRemoveNonExistentRoot() {
 	}
 
 	@Test
-	@Disabled
 	void testReadResource() {
-		withClient(createMcpTransport(), mcpAsyncClient -> {
-			StepVerifier.create(mcpAsyncClient.listResources()).consumeNextWith(resources -> {
-				if (!resources.resources().isEmpty()) {
-					Resource firstResource = resources.resources().get(0);
-					StepVerifier.create(mcpAsyncClient.readResource(firstResource)).consumeNextWith(result -> {
-						assertThat(result).isNotNull();
-						assertThat(result.contents()).isNotNull();
-					}).verifyComplete();
+		withClient(createMcpTransport(), client -> {
+			Flux<McpSchema.ReadResourceResult> resources = client.initialize()
+				.then(client.listResources(null))
+				.flatMapMany(r -> Flux.fromIterable(r.resources()))
+				.flatMap(r -> client.readResource(r));
+
+			StepVerifier.create(resources).recordWith(ArrayList::new).consumeRecordedWith(readResourceResults -> {
+
+				for (ReadResourceResult result : readResourceResults) {
+
+					assertThat(result).isNotNull();
+					assertThat(result.contents()).isNotNull().isNotEmpty();
+
+					// Validate each content item
+					for (ResourceContents content : result.contents()) {
+						assertThat(content).isNotNull();
+						assertThat(content.uri()).isNotNull().isNotEmpty();
+						assertThat(content.mimeType()).isNotNull().isNotEmpty();
+
+						// Validate content based on its type with more comprehensive
+						// checks
+						switch (content.mimeType()) {
+							case "text/plain" -> {
+								TextResourceContents textContent = assertInstanceOf(TextResourceContents.class,
+										content);
+								assertThat(textContent.text()).isNotNull().isNotEmpty();
+								assertThat(textContent.uri()).isNotEmpty();
+							}
+							case "application/octet-stream" -> {
+								BlobResourceContents blobContent = assertInstanceOf(BlobResourceContents.class,
+										content);
+								assertThat(blobContent.blob()).isNotNull().isNotEmpty();
+								assertThat(blobContent.uri()).isNotNull().isNotEmpty();
+								// Validate base64 encoding format
+								assertThat(blobContent.blob()).matches("^[A-Za-z0-9+/]*={0,2}$");
+							}
+							default -> {
+
+								// Still validate basic properties
+								if (content instanceof TextResourceContents textContent) {
+									assertThat(textContent.text()).isNotNull();
+								}
+								else if (content instanceof BlobResourceContents blobContent) {
+									assertThat(blobContent.blob()).isNotNull();
+								}
+							}
+						}
+					}
 				}
-			}).verifyComplete();
+			})
+				.expectNextCount(10) // Expect 10 elements
+				.verifyComplete();
 		});
 	}