feat(tests): Add comprehensive tests for Docker image export and streaming functionality

ts/classes.host.ts

@@ -262,12 +262,19 @@ export class DockerHost {
     // Parse the response body based on content type
     let body;
     const contentType = response.headers['content-type'] || '';
-    if (contentType.includes('application/json')) {
+    
+    // Docker's streaming endpoints (like /images/create) return newline-delimited JSON
+    // which can't be parsed as a single JSON object
+    const isStreamingEndpoint = routeArg.includes('/images/create') || 
+                                routeArg.includes('/images/load') ||
+                                routeArg.includes('/build');
+    
+    if (contentType.includes('application/json') && !isStreamingEndpoint) {
       body = await response.json();
     } else {
       body = await response.text();
-      // Try to parse as JSON if it looks like JSON
-      if (body && (body.startsWith('{') || body.startsWith('['))) {
+      // Try to parse as JSON if it looks like JSON and is not a streaming response
+      if (!isStreamingEndpoint && body && (body.startsWith('{') || body.startsWith('['))) {
         try {
           body = JSON.parse(body);
         } catch {
@@ -299,7 +306,8 @@ export class DockerHost {
       .header('Content-Type', 'application/json')
       .header('X-Registry-Auth', this.registryToken)
       .header('Host', 'docker.sock')
-      .options({ keepAlive: false });
+      .timeout(600000) // Set 10 minute timeout for streaming operations
+      .options({ keepAlive: false, autoDrain: false }); // Disable auto-drain for streaming
     
     // If we have a readStream, use the new stream method with logging
     if (readStream) {

ts/classes.image.ts

@@ -250,6 +250,12 @@ export class DockerImage {
   public async exportToTarStream(): Promise<plugins.smartstream.stream.Readable> {
     logger.log('info', `Exporting image ${this.RepoTags[0]} to tar stream.`);
     const response = await this.dockerHost.requestStreaming('GET', `/images/${encodeURIComponent(this.RepoTags[0])}/get`);
+    
+    // Check if response is a Node.js stream
+    if (!response || typeof response.on !== 'function') {
+      throw new Error('Failed to get streaming response for image export');
+    }
+    
     let counter = 0;
     const webduplexStream = new plugins.smartstream.SmartDuplex({
       writeFunction: async (chunk, tools) => {
@@ -259,17 +265,25 @@ export class DockerImage {
         return chunk;
       }
     });
+    
     response.on('data', (chunk) => {
       if (!webduplexStream.write(chunk)) {
         response.pause();
         webduplexStream.once('drain', () => {
           response.resume();
-        })
-      };
+        });
+      }
     });
+    
     response.on('end', () => {
       webduplexStream.end();
-    })
+    });
+    
+    response.on('error', (error) => {
+      logger.log('error', `Error during image export: ${error.message}`);
+      webduplexStream.destroy(error);
+    });
+    
     return webduplexStream;
   }
 }

ts/classes.service.ts

@@ -89,6 +89,11 @@ export class DockerService {
     }> = [];
 
     for (const network of serviceCreationDescriptor.networks) {
+      // Skip null networks (can happen if network creation fails)
+      if (!network) {
+        logger.log('warn', 'Skipping null network in service creation');
+        continue;
+      }
       networkArray.push({
         Target: network.Name,
         Aliases: [serviceCreationDescriptor.networkAlias],