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

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;
   }
 }